ORCID Profile
0000-0002-3383-0006
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Chemical Engineering | Membrane and Separation Technologies | Membrane And Separation Technologies | Environmental Technologies | Environmental Engineering | Functional Materials | Wastewater Treatment Processes | Main Group Metal Chemistry | Colloid and Surface Chemistry | Colloid And Surface Chemistry | Inorganic Chemistry | Biomechanical Engineering | Environmental Technologies | Synchrotrons; Accelerators; Instruments and Techniques | Theory and Design of Materials | Other Physical Sciences | Materials Engineering | Fluidisation and Fluid Mechanics | Fertilisers and Agrochemicals (Application etc.) | Food Processing | Interdisciplinary Engineering | Ceramics | Water Treatment Processes |
ANZSRC Socio-Economic Objective (SEO)
Urban and Industrial Water Management | Water services and utilities | Electricity, gas and water services and utilities | Management of Water Consumption by Mineral Resource Activities | Industry | Organic Fertilisers | Primary Mining and Extraction of Mineral Resources not elsewhere classified | Processed food products and beverages | Expanding Knowledge in Technology | Environmentally Sustainable Mineral Resource Activities not elsewhere classified | Land and water management | Industrial Energy Conservation and Efficiency | Renewable energy not elsewhere classified (e.g. geothermal) | Expanding Knowledge in the Earth Sciences | Expanding Knowledge in the Chemical Sciences | Expanding Knowledge in the Physical Sciences | Industrial Chemicals and Related Products not elsewhere classified | Scientific Instruments | Waste management | Processed Food Products and Beverages (excl. Dairy Products) not elsewhere classified | Coated Metal and Metal-Coated Products
Related Links
Publications
Seeded growth of ZIF-8 on the surface of carbon nanotubes towards self-supporting gas separation membranes
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA11483J
Customizing the surface charge of thin-film composite membranes by surface plasma thin film polymerization
Publisher: Elsevier BV
Date: 09-2017
MOF-Coated Optical Fiber Sensor for Detection of 4-Aminopyridine in Water
Publisher: OSA
Date: 2018
Silica Nafion Modified Composite Membranes for Direct Methanol Fuel Cells
Publisher: Wiley
Date: 2006
Abstract: Direct Methanol Fuel Cells (DMFCs) operate by electro‐oxidation of methanol and the transport of the protons by means of a polymer electrolyte membrane. Current systems employ Nafion (perjluorosulphonic acid) membranes as the transport media for the protons, which experience a high methanol crossover reducing the efficiency by the oxygen reduction reaction at the anode side of the fuel cell. This work investigated the microstructural modification of Nafion membranes with silica nanoparticles. It was shown that this mod4cation led to reduced methanol crossover, whilst methanol permeability was slightly reduced without compromising the conductivity at the normal DMFC operation temperature (75‐80°C). Methanol uptake was reduced by 55% with the incorporation of the silica nanoparticles into the Nafion matrix. In addition, pure methanol uptake appeared to be less effective than methanol mixtures. These results indicated the presence of water assisted methanol permeation as the hydrophilic sulphonic group and the hydrophobic polymeric backbone of Nafion were sensitive to methanol solvation.
UiO-66 MOF end-face-coated optical fiber in aqueous contaminant detection
Publisher: The Optical Society
Date: 05-04-2016
DOI: 10.1364/OL.41.001696
Treatment of RO brine from CSG produced water by spiral-wound air gap membrane distillation — A pilot study
Publisher: Elsevier BV
Date: 06-2015
Effect of oxidation with coagulation and ceramic microfiltration pre-treatment on reverse osmosis for desalination of recycled wastewater
Publisher: Elsevier BV
Date: 04-2018
Fabrication of thin film composite poly(amide)-carbon-nanotube supported membranes for enhanced performance in osmotically driven desalination systems
Publisher: Elsevier BV
Date: 2013
Carbon nanotube based composite membranes for water desalination by membrane distillation
Publisher: Informa UK Limited
Date: 05-2010
Characterization of carbon nanotube webs and yarns with small angle X-ray scattering: Revealing the yarn twist and inter-nanotube interactions and alignment
Publisher: Elsevier BV
Date: 11-2013
Inter-layer free cobalt-doped silica membranes for pervaporation of ammonia solutions
Publisher: Elsevier BV
Date: 05-2018
Next generation membranes for membrane distillation and future prospects
Publisher: Elsevier
Date: 2015
Impact of ozonation and biological activated carbon filtration on ceramic membrane fouling
Publisher: Elsevier BV
Date: 12-2017
DOI: 10.1016/J.WATRES.2017.09.012
Abstract: Ozone pre-treatment (ozonation, ozonisation) and biological activated carbon (BAC) filtration pre-treatment for the ceramic microfiltration (CMF) treatment of secondary effluent (SE) were studied. Ozone pre-treatment was found to result in higher overall removal of UV absorbance (UVA
Properties of acid whey as a function of pH and temperature
Publisher: American Dairy Science Association
Date: 07-2015
Abstract: Compositional differences of acid whey (AW) in comparison with other whey types limit its processability and application of conventional membrane processing. Hence, the present study aimed to identify chemical and physical properties of AW solutions as a function of pH (3 to 10.5) at 4 different temperatures (15, 25, 40, or 90°C) to propose appropriate membrane-processing conditions for efficient use of AW streams. The concentration of minerals, mainly calcium and phosphate, and proteins in centrifuged supernatants was significantly lowered with increase in either pH or temperature. Lactic acid content decreased with pH decline and rose at higher temperatures. Calcium appeared to form complexes with phosphates and lactates mainly, which in turn may have induced molecular attractions with the proteins. An increase in pH led to more soluble protein aggregates with large particle sizes. Surface hydrophobicity of these particles increased significantly with temperature up to 40°C and decreased with further heating to 90°C. Surface charge was clearly pH dependent. High lactic acid concentrations appeared to hinder protein aggregation by hydrophobic interactions and may also indirectly influence protein denaturation. Processing conditions such as pH and temperature need to be optimized to manipulate composition, state, and surface characteristics of components of AW systems to achieve an efficient separation and concentration of lactic acid and lactose.
Effects of dope sonication and hydrophilic polymer addition on the properties of low pressure PVDF mixed matrix membranes
Publisher: Elsevier BV
Date: 10-2017
Assessment of pressure decay test for RO protozoa removal validation in remote operations
Publisher: Elsevier BV
Date: 05-2016
Co3+ homogeneous mediator generation efficiency in a divided tubular electrochemical reactor with MFI-type zeolite membrane
Publisher: Elsevier BV
Date: 08-2017
Synthetic magnetite, maghemite, and haematite activation of persulphate for orange G degradation
Publisher: Elsevier BV
Date: 08-2018
DOI: 10.1016/J.JCONHYD.2018.07.004
Abstract: Due to the widespread application of persulphate (PS) for in-situ chemical oxidation (ISCO), the PS activating role of naturally occurring minerals, such as iron oxides, has been the subject of a number of studies. However, major discrepancies remain as to the effectiveness, mode, and factors that influence iron oxides activation of PS. In this study, an attempt has been made to bridge this important knowledge gaps by a systematic study of PS activation, measured by orange G degradation, using commercial and self-synthesised magnetite, maghemite, and haematite particles. The results showed that the activation of PS by iron oxides does not depend on mineralogy, surface area or concentration of surface OH groups, but on crystalline inhomogeneities or structural irregularities. Significant dissolution of iron oxides accompanied PS activation, in a mainly homogeneous process, requiring a low pH environment to be effective. The activation of PS by iron oxides at neutral pH was found to be no better than dissolved iron activation contrary to some earlier publications. The results also suggest that under alkaline conditions, PS alone was more effective in degrading orange G than with iron oxides or dissolved iron activation. Phosphate buffer significantly retarded orange G degradation by iron-activated or unactivated PS with negative implication for ISCO in non-acidic, buffering environments. The results of this study contribute to enhancing the fundamental understanding of ISCO processes.
The influence of seawater ions on the structural features of MFI, FAU and LTA zeolites
Publisher: IEEE
Date: 02-2010
Assessment of postcombustion carbon capture technologies for power generation
Publisher: Springer Science and Business Media LLC
Date: 16-09-2009
Scale reduction and cleaning techniques during direct contact membrane distillation of seawater reverse osmosis brine
Publisher: Elsevier BV
Date: 10-2015
Modeling hydrogen separation in high temperature silica membrane systems
Publisher: Wiley
Date: 02-2006
DOI: 10.1002/AIC.10777
Membrane reactor modelling, validation and simulation for the WGS reaction using metal doped silica membranes
Publisher: Wiley
Date: 21-08-2009
DOI: 10.1002/APJ.382
A new integrated potable reuse process for a small remote community in Antarctica
Publisher: Elsevier BV
Date: 11-2016
Aqueous contaminant detection via UiO-66 thin film optical fiber sensor platform with fast Fourier transform based spectrum analysis
Publisher: IOP Publishing
Date: 14-12-2018
Activation of gold decorated carbon nanotube hybrids for targeted gas adsorption and enhanced catalytic oxidation
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM16458B
Growth of nano-textured graphene coatings across highly porous stainless steel supports towards corrosion resistant coatings
Publisher: Elsevier BV
Date: 06-2016
Steel wool and carbonyl iron powder activation of persulphate for the degradation of pollutants
Publisher: Elsevier BV
Date: 10-2018
Proof of Concept for Light Conducting Membrane Substrate for UV-Activated Photocatalysis as an Alternative to Chemical Cleaning
Publisher: MDPI AG
Date: 02-12-2018
Abstract: Adopting an effective strategy to control fouling is a necessary requirement for all membrane processes used in the water/wastewater treatment industry to operate sustainably. The use of ultraviolet (UV) activated photocatalysis has been shown to be effective in mitigating ceramic membrane fouling by natural organic matter. The widely used configuration in which light is directed through the polluted water to the membrane’s active layer suffers from inefficiencies brought about by light absorption by the pollutants and light shielding by the cake layer. To address these limitations, directing light through the substrate, instead of through polluted water, was studied. A UV conducting membrane was prepared by dip coating TiO2 onto a sintered glass substrate. The substrate could successfully conduct UV from a l source, unlike a typical alumina substrate. The prepared membrane was applied in the filtration of a humic acid solution as a model compound to study natural organic matter membrane fouling. Directing UV through the substrate showed only a 1 percentage point decline in the effectiveness of the cleaning method over two cleaning events from 72% to 71%, while directing UV over the photocatalytic layer had a 9 percentage point decline from 84% to 75%. Adapting the UV-through-substrate configuration could be more useful in maintaining membrane functionality during humic acid filtration than the current method being used.
Combined TiO2membrane filtration and ozonation for efficient water treatment to enhance the reuse of wastewater
Publisher: Informa UK Limited
Date: 10-2011
Influence of pre-treatment combinations on RO membrane fouling
Publisher: Elsevier BV
Date: 09-2016
Performance of Hybrid Photocatalytic-Ceramic Membrane System for the Treatment of Secondary Effluent
Publisher: MDPI AG
Date: 28-03-2017
Silica membrane reactors for hydrogen processing
Publisher: Informa UK Limited
Date: 02-2007
Body Mass and Hypertension in Women
Publisher: American College of Physicians
Date: 07-1998
Activation of Persulfate at Waste Heat Temperatures for Humic Acid Degradation
Publisher: American Chemical Society (ACS)
Date: 13-02-2018
Selective sensing of alcohols in water influenced by chemically Zeolite coatings on optical fiber sensors
Publisher: SPIE
Date: 02-06-2014
DOI: 10.1117/12.2059516
Scaling control during membrane distillation of coal seam gas reverse osmosis brine
Publisher: Elsevier BV
Date: 11-2015
Nanoparticle Incorporation into Desalination and Water Treatment Membranes—Potential Advantages and Challenges
Publisher: Elsevier
Date: 2017
Improving cell yield and lactic acid production of Lactococcus lactis ssp. cremoris by a novel submerged membrane fermentation process
Publisher: Elsevier BV
Date: 06-2012
Structural effects on SAPO-34 and ZIF-8 materials exposed to seawater solutions, and their potential as desalination membranes
Publisher: Elsevier BV
Date: 2016
Strategies for maximizing removal of lactic acid from acid whey - Addressing the un-processability issue
Publisher: Elsevier BV
Date: 2017
MFI-type zeolite functional liquid phase sensor coated on the optical fiber end-face
Publisher: SPIE
Date: 31-01-2012
DOI: 10.1117/12.915941
Ozone combined with ceramic membranes for water treatment: Impact on HO radical formation and mitigation of bromate
Publisher: Elsevier BV
Date: 2020
DOI: 10.1016/J.JENVMAN.2019.109655
Abstract: The beneficial effect of combining ozone with ceramic membrane filtration (CMF) to enhance membrane flux performances during water treatment (e.g., wastewater and drinking water) could be related to the formation of hydroxyl (HO) radicals from the interaction of ozone with ceramic membrane. To explore this effect, para-chlorobenzoic acid was used to probe HO radical activity during a combined ozone/CMF process using a 0.1 μm pore size membrane supplied by Metawater, Japan. Tests were then extended to explore the impact on bromate formation downstream CMF, a well-known undesirable by-product from ozone use in water treatment. Ozone reduction by the membrane and its module appeared to be more associated with physical degassing, but a noticeable formation of HO radicals was observed during the interaction of ozone with the ceramic membrane. CMF treatment of ozonated potable water containing bromide showed a reduced bromate formation of 50% when the water was recirculated to the filtration module containing the ceramic membrane, compared to the experiment performed with an empty module. Single pass experiments showed bromate mitigation of around 10%. The mitigation of bromate formation was attributed to reduced overall ozone exposure by deagassing effect, but also potentially from suppression of the oxidation of Br
Multi-layered silica-carbon molecular sieve membranes for CO/sub 2/ separation
Publisher: IEEE
Date: 2006
Qualitative spectroscopic characterization of the matrix-silane coupling agent interface across metal fibre reinforced ion exchange resin composite membranes
Publisher: Elsevier BV
Date: 11-2014
Inorganic membranes for hydrogen production and purification: A critical review and perspective
Publisher: Elsevier BV
Date: 10-2007
DOI: 10.1016/J.JCIS.2007.05.067
Abstract: Hydrogen as a high-quality and clean energy carrier has attracted renewed and ever-increasing attention around the world in recent years, mainly due to developments in fuel cells and environmental pressures including climate change issues. In thermochemical processes for hydrogen production from fossil fuels, separation and purification is a critical technology. Where water-gas shift reaction is involved for converting the carbon monoxide to hydrogen, membrane reactors show great promises for shifting the equilibrium. Membranes are also important to the subsequent purification of hydrogen. For hydrogen production and purification, there are generally two classes of membranes both being inorganic: dense phase metal and metal alloys, and porous ceramic membranes. Porous ceramic membranes are normally prepared by sol-gel or hydrothermal methods, and have high stability and durability in high temperature, harsh impurity and hydrothermal environments. In particular, microporous membranes show promises in water gas shift reaction at higher temperatures. In this article, we review the recent advances in both dense phase metal and porous ceramic membranes, and compare their separation properties and performance in membrane reactor systems. The preparation, characterization and permeation of the various membranes will be presented and discussed. We also aim to examine the critical issues in these membranes with respect to the technical and economical advantages and disadvantages. Discussions will also be made on the relevance and importance of membrane technology to the new generation of zero-emission power technologies.
The impact of hydrophobic coating on the performance of carbon nanotube bucky-paper membranes in membrane distillation
Publisher: Elsevier BV
Date: 12-2011
Treatment of secondary effluent by sequential combination of photocatalytic oxidation with ceramic membrane filtration
Publisher: Springer Science and Business Media LLC
Date: 05-2017
DOI: 10.1007/S11356-017-9070-X
Abstract: The aim of the present work was to experimentally evaluate an alternative advanced wastewater treatment system, which combines the action of photocatalytic oxidation with ceramic membrane filtration. Experiments were carried out using laboratory scale TiO
Critical review of the science and sustainability of persulphate advanced oxidation processes
Publisher: Elsevier BV
Date: 04-2018
Enhanced durability and hydrophobicity of carbon nanotube bucky paper membranes in membrane distillation
Publisher: Elsevier BV
Date: 07-2011
Diffusion behaviour of multivalent ions at low pH through a MFI-type zeolite membrane
Publisher: Elsevier BV
Date: 08-2018
Performance of a two-stage membrane system for bromelain separation from pineapple waste mixture as impacted by enzymatic pretreatment and diafiltration
Publisher: Faculty of Food Technology and Biotechnology - University of Zagreb
Date: 2018
Sustainable waste water deammonification by vacuum membrane distillation without pH adjustment: Role of water chemistry
Publisher: Elsevier BV
Date: 11-2017
Small Scale Direct Potable Reuse (DPR) Project for a Remote Area
Publisher: MDPI AG
Date: 08-08-2015
DOI: 10.3390/W9020094
The fabrication and surface functionalization of porous metal frameworks-a review
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA13240D
Silica membrane reactors for hydrogen production from water gas shift
Publisher: IEEE
Date: 2006
Effects of operating parameters on permeation flux for desalination of sodium chloride solution using air gap membrane distillation
Publisher: Informa UK Limited
Date: 2010
DOI: 10.5004/DWT.2010.994
A high volume and low damage route to hydroxyl functionalization of carbon nanotubes using hard X-ray lithography
Publisher: Elsevier BV
Date: 2013
Characteristic properties of crude pineapple waste extract for bromelain purification by membrane processing
Publisher: Springer Science and Business Media LLC
Date: 22-03-2015
Characterization and Pervaporation Study on Ethanol Separation Membranes
Publisher: Informa UK Limited
Date: 25-03-2009
Performance assessment of membrane distillation for skim milk and whey processing
Publisher: American Dairy Science Association
Date: 2014
Abstract: Membrane distillation is an emerging membrane process based on evaporation of a volatile solvent. One of its often stated advantages is the low flux sensitivity toward concentration of the processed fluid, in contrast to reverse osmosis. In the present paper, we looked at 2 high-solids applications of the dairy industry: skim milk and whey. Performance was assessed under various hydrodynamic conditions to investigate the feasibility of fouling mitigation by changing the operating parameters and to compare performance to widespread membrane filtration processes. Whereas filtration processes are hydraulic pressure driven, membrane distillation uses vapor pressure from heat to drive separation and, therefore, operating parameters have a different bearing on the process. Experimental and calculated results identified factors influencing heat and mass transfer under various operating conditions using polytetrafluoroethylene flat-sheet membranes. Linear velocity was found to influence performance during skim milk processing but not during whey processing. Lower feed and higher permeate temperature was found to reduce fouling in the processing of both dairy solutions. Concentration of skim milk and whey by membrane distillation has potential, as it showed high rejection (>99%) of all dairy components and can operate using low electrical energy and pressures (<10 kPa). At higher cross-flow velocities (around 0.141 m/s), fluxes were comparable to those found with reverse osmosis, achieving a sustainable flux of approximately 12 kg/h·m(2) for skim milk of 20% dry matter concentration and approximately 20 kg/h·m(2) after 18 h of operation with whey at 20% dry matter concentration.
Desalination of seawater ion complexes by MFI-type zeolite membranes: Temperature and long term stability
Publisher: Elsevier BV
Date: 03-2014
Comparison of the effects of ozone, biological activated carbon (BAC) filtration and combined ozone-BAC pre-treatments on the microfiltration of secondary effluent
Publisher: Elsevier BV
Date: 05-2019
Small angle X-ray scattering study of carbon nanotube forests densified into long range patterns by controlled solvent evaporation
Publisher: Elsevier BV
Date: 10-2013
DOI: 10.1016/J.JCIS.2013.06.018
Abstract: Although emergent properties from self-assembly of carbon nanotubes have been described in various forms there is so far no systematic process for the preparation of dense arrays of aligned nanotubes. Here we present a systematic study on the analysis of the alignment of carbon nanotubes within solvent densified carbon nanotube forests. Highly periodic patterns with length scales of the order of the millimetres were generated and characterized by electron and optical micrographs and compared to results from small angle X-ray scattering performed at various incident beam angles. The impact of the different solvents was also discussed in light of the densification process and in relation to solvent properties.
Diffusion behavior of humic acid during desalination with air gap and water gap membrane distillation
Publisher: Elsevier BV
Date: 07-2019
DOI: 10.1016/J.WATRES.2019.03.055
Abstract: Desalination and water reuse are important means to resolve local water scarcity and security issues worldwide where membrane distillation (MD) may be part of a solution. Natural organic matter and in particular, humic acids (HA), are widely present in water supplies to be treated but exhibit little understood behavior to diffuse through MD membranes into permeate. In this work, air gap (AGMD) and water gap (WGMD) were utilized to study HA behavior in MD using seawater and synthetic water over a range of typical MD temperatures, flow rates and membrane types. HA diffusion was first shown with seawater feed then on synthetic solutions at all process conditions. While electrical conductivity rejection was always above than 99%, HA rejection showed values of 33% and 90% for AGMD and 68% and 93% for WGMD with seawater and synthetic water, respectively. Analytical techniques were used to perform a preliminary organic matter characterization in permeate, obtaining clear differences between the feed and permeate HA property. Compared to hydrophobic membranes, uniquely oleophobic membranes inhibit HA diffusion suggesting hydrophobic surface diffusion of HA through the membrane. HA flux as well as potential undesirable effects of the organic matter in permeate should be considered for MD applications.
Performance of porous inorganic membranes in non-osmotic desalination
Publisher: Elsevier BV
Date: 09-2007
DOI: 10.1016/J.WATRES.2007.05.028
Abstract: The supply security of fresh drinking water is decreasing and raising a critical situation for communities worldwide. Inorganic membranes such as alumina and molecular sieve silica have in the past been shown to be highly effective at separating gases and could offer promise as liquid separators due to their high flux and stability. In this work, we develop a range of inorganic membranes with pore size ranging from 0.3 to 500nm and relate this to separation and transport performance. Best separation results were achieved for the silica membrane pressurised to only 7bar, exhibiting a flux of around 1.8kgm(-2)h(-1) and NaCl rejection of 98% with 3.5wt% (seawater-like) feed. Potable water from seawater-like feed was achieved from the membrane in a single stage after regeneration. Conditions such as pressure and temperature were also modified showing performance characteristics and diffusion mechanisms. The non-osmotic set-up for inorganic membranes is therefore a viable technology for desalination.
Investigation of the dispersion of nanoclays into PVDF for enhancement of physical membrane properties
Publisher: Informa UK Limited
Date: 10-2011
Metal-organic-framework-coated optical fibers as light-triggered drug delivery vehicles
Publisher: Wiley
Date: 08-03-2016
Effect of addition of two-dimensional ZIF-L nanoflakes on the properties of polyethersulfone ultrafiltration membrane
Publisher: Elsevier BV
Date: 06-2014
Production and characterisation of UF membranes by chemical conversion of used RO membranes
Publisher: Elsevier BV
Date: 11-2013
Separation of bromelain from crude pineapple waste mixture by a two-stage ceramic ultrafiltration process
Publisher: Elsevier BV
Date: 04-2016
The role of membrane surface energy on direct contact membrane distillation performance
Publisher: Elsevier BV
Date: 08-2013
Feasibility, mechanisms, and optimisation of organic pollutant degradation by thermally activated persulphate
Publisher: Elsevier BV
Date: 08-2018
Experimental and theoretical investigation of diffusion processes in a membrane anaerobic reactor for bio-hydrogen production
Publisher: Elsevier BV
Date: 06-2010
Direct Contact Membrane Distillation of Dairy Process Streams
Publisher: MDPI AG
Date: 04-01-2011
Plasma-induced physicochemical effects on a poly(amide) thin-film composite membrane
Publisher: Elsevier BV
Date: 02-2017
Fouling mechanisms of dairy streams during membrane distillation
Publisher: Elsevier BV
Date: 08-2013
Nanofiltration and nanodiafiltration of acid whey as a function of pH and temperature
Publisher: Elsevier BV
Date: 02-2016
Metal doped silica membrane reactor: Operational effects of reaction and permeation for the water gas shift reaction
Publisher: Elsevier BV
Date: 05-2008
Light-triggered 5-fluorouracil release via UiO-66 coated optical fiber
Publisher: SPIE
Date: 28-07-2017
DOI: 10.1117/12.2283337
Dual function filtration and catalytic breakdown of organic pollutants in wastewater using ozonation with titania and alumina membranes
Publisher: Elsevier BV
Date: 08-2011
Recovery of water and acid from leach solutions using direct contact membrane distillation
Publisher: IWA Publishing
Date: 14-12-2014
DOI: 10.2166/WST.2013.788
Abstract: This paper describes for the first time the use of direct contact membrane distillation (DCMD) for acid and water recovery from a real leach solution generated by a hydrometallurgical plant. The leach solutions considered contained H2SO4 or HCl. In all tests the temperature of the feed solution was kept at 60 °C. The test work showed that fluxes were within the range of 18–33 kg/m2/h and 15–35 kg/m2/h for the H2SO4 and HCl systems, respectively. In the H2SO4 leach system, the final concentration of free acid in the s le solution increased on the concentrate side of the DCMD system from 1.04 M up to 4.60 M. The sulfate separation efficiency was over 99.9% and overall water recovery exceeded 80%. In the HCl leach system, HCl vapour passed through the membrane from the feed side to the permeate. The concentration of HCl captured in the permeate was about 1.10 M leaving behind only 0.41 M in the feed from the initial concentration of 2.13 M. In all the experiments, salt rejection was & .9%. DCMD is clearly viable for high recovery of high quality water and concentrated H2SO4 from spent sulfuric acid leach solution where solvent extraction could then be applied to recover the sulfuric acid and metals. While HCl can be recovered for reuse using only DCMD.
Integration of membrane distillation into heat paths of industrial processes
Publisher: Elsevier BV
Date: 11-2012
Enhanced abrasion resistant PVDF/nanoclay hollow fibre composite membranes for water treatment
Publisher: Elsevier BV
Date: 2014
Inorganic membranes special edition
Publisher: Elsevier BV
Date: 06-2015
Relating water vapor transfer to ammonia recovery from biogas slurry by vacuum membrane distillation
Publisher: Elsevier BV
Date: 2018
Towards new opportunities for reuse, recycling and disposal of used reverse osmosis membranes
Publisher: Elsevier BV
Date: 08-2012
Short Review on Porous Metal Membranes—Fabrication, Commercial Products, and Applications
Publisher: MDPI AG
Date: 18-09-2018
Abstract: Porous metal membranes have recently received increasing attention, and significant progress has been made in their preparation and characterisation. This progress has stimulated research in their applications in a number of key industries including wastewater treatment, dairy processing, wineries, and biofuel purification. This review examines recent significant progress in porous metal membranes including novel fabrication concepts and applications that have been reported in open literature or obtained in our laboratories. The advantages and disadvantages of the different membrane fabrication methods were presented in light of improving the properties of current membrane materials for targeted applications. Sintering of particles is one of the main approaches that has been used for the fabrication of commercial porous metal membranes, and it has great advantages for the fabrication of hollow fibre metal membranes. However, sintering processes usually result in large pores (e.g., µm). So far, porous metal membranes have been mainly used for the filtration of liquids to remove the solid particles. For porous metal membranes to be more widely used across a number of separation applications, particularly for water applications, further work needs to focus on the development of smaller pore (e.g., sub-micron) metal membranes and the significant reduction of capital and maintenance costs.
Nafion/polyaniline/silica composite membranes for direct methanol fuel cell application
Publisher: Elsevier BV
Date: 04-2007
Thermo-responsive nanofibrous composite membranes for efficient self-cleaning of protein foulants
Publisher: Elsevier BV
Date: 03-2019
Hydrothermal stability of cobalt silica membranes in a water gas shift membrane reactor
Publisher: Elsevier BV
Date: 04-2009
Designing hierarchical porous features of ZSM-5 zeolites via Si/Al ratio and their dynamic behavior in seawater ion complexes
Publisher: Elsevier BV
Date: 06-2013
UV/TiO2 photocatalytic oxidation of recalcitrant organic matter: effect of salinity and pH
Publisher: IWA Publishing
Date: 27-05-2014
DOI: 10.2166/WST.2014.221
Abstract: Photocatalytic oxidation processes have interest for water treatment since these processes can remove recalcitrant organic compounds and operate at mild conditions of temperature and pressure. However, performance under saline conditions present in many water resources is not well known. This study aims to explore the basic effects of photocatalysis on the removal of organic matter in the presence of salt. A laboratory-scale photocatalytic reactor system, employing ultraviolet (UV)/titanium dioxide (TiO2) photocatalysis was evaluated for its ability to remove the humic acid (HA) from saline water. The particle size and zeta potential of TiO2 under different conditions including solution pH and sodium chloride (NaCl) concentrations were characterized. The overall degradation of organics over the NaCl concentration range of 500–2,000 mg/L was found to be 80% of the non-saline equivalent after 180 min of the treatment. The results demonstrated that the adsorption of HA onto the TiO2 particles was dependent on both the pH and salinity due to electrostatic interaction and highly unstable agglomerated dispersion. This result supports UV/TiO2 as a viable means to remove organic compounds, but the presence of salt in waters to be treated will influence the performance of the photocatalytic oxidation process.
Highly-Efficient Sulfonated UiO-66(Zr) Optical Fiber for Rapid Detection of Trace Levels of Pb2+
Publisher: MDPI AG
Date: 03-06-2021
DOI: 10.3390/IJMS22116053
Abstract: Lead detection for biological environments, aqueous resources, and medicinal compounds, rely mainly on either utilizing bulky lab equipment such as ICP-OES or ready-made sensors, which are based on colorimetry with some limitations including selectivity and low interference. Remote, rapid and efficient detection of heavy metals in aqueous solutions at ppm and sub-ppm levels have faced significant challenges that requires novel compounds with such ability. Here, a UiO-66(Zr) metal-organic framework (MOF) functionalized with SO3H group (SO3H-UiO-66(Zr)) is deposited on the end-face of an optical fiber to detect lead cations (Pb2+) in water at 25.2, 43.5 and 64.0 ppm levels. The SO3H-UiO-66(Zr) system provides a Fabry–Perot sensor by which the lead ions are detected rapidly (milliseconds) at 25.2 ppm aqueous solution reflecting in the wavelength shifts in interference spectrum. The proposed removal mechanism is based on the adsorption of [Pb(OH2)6]2+ in water on SO3H-UiO-66(Zr) due to a strong affinity between functionalized MOF and lead. This is the first work that advances a multi-purpose optical fiber-coated functional MOF as an on-site remote chemical sensor for rapid detection of lead cations at extremely low concentrations in an aqueous system.
Fouling of dairy components on hydrophobic polytetrafluoroethylene (PTFE) membranes for membrane distillation
Publisher: Elsevier BV
Date: 09-2013
In situ small angle X-ray scattering investigation of the thermal expansion and related structural information of carbon nanotube composites
Publisher: Elsevier BV
Date: 12-2012
Dual Functional Ultrafiltration Membranes with Enzymatic Digestion and Thermo-Responsivity for Protein Self-Cleaning
Publisher: MDPI AG
Date: 19-09-2018
Abstract: Controlling surface–protein interaction during wastewater treatment is the key motivation for developing functionally modified membranes. A new biocatalytic thermo-responsive poly vinylidene fluoride (PVDF)/nylon-6,6 oly(N-isopropylacrylamide)(PNIPAAm) ultrafiltration membrane was fabricated to achieve dual functionality of protein-digestion and thermo-responsive self-cleaning. The PVDF/nylon-6,6/PNIPAAm composite membranes were constructed by integrating a hydrophobic PVDF cast layer and hydrophilic nylon-6,6/PNIPAAm nanofiber layer on to which trypsin was covalently immobilized. The enzyme immobilization density on the membrane surface decreased with increasing PNIPAAm concentration, due to the decreased number of amine functional sites. An ultrafiltration study was performed using the synthetic model solution containing BSA/NaCl/CaCl2, where the PNIPAAm containing biocatalytic membranes demonstrated a combined effect of enzymatic and thermo-switchable self-cleaning. The membrane without PNIPAAm revealed superior fouling resistance and self-cleaning with an RPD of 22%, compared to membranes with 2 and 4 wt % PNIPAAm with 26% and 33% RPD, respectively, after an intermediate temperature cleaning at 50 °C, indicating that higher enzyme density offers more efficient self-cleaning than the combined effect of enzyme and PNIPAAm at low concentration. The conformational volume phase transition of PNIPAAm did not affect the stability of immobilized trypsin on membrane surfaces. Such novel surface engineering design offer a promising route to mitigate surface–protein contamination in wastewater applications.
Recent Developments in Carbon Nanotube Membranes for Water Purification and Gas Separation
Publisher: MDPI AG
Date: 04-01-2010
DOI: 10.3390/MA3010127
Light conducting photocatalytic membrane for chemical-free fouling control in water treatment
Publisher: Elsevier BV
Date: 06-2020
Sunlight-Transmitting Photocatalytic Membrane for Reduced Maintenance Water Treatment
Publisher: American Chemical Society (ACS)
Date: 10-08-2021
Membrane Distillation of Meat Industry Effluent with Hydrophilic Polyurethane Coated Polytetrafluoroethylene Membranes
Publisher: MDPI AG
Date: 29-09-2017
Dual Functional Ultrafiltration Membranes with Enzymatic Digestion and Thermo-Responsivity for Protein Self-Cleaning
Publisher: MDPI AG
Date: 24-08-2018
DOI: 10.20944/PREPRINTS201808.0428.V1
Abstract: Controlling surface-protein interaction during wastewater treatment is the key motivation for developing functionally modified membranes. A new biocatalytic thermo-responsive poly(vinylidene fluoride)(PVDF)/nylon-6,6 oly(N-isopropylacrylamide)(PNIPAAm) ultrafiltration membrane was fabricated to achieve dual functionality of protein-digestion and thermo-responsive self-cleaning. The PVDF/nylon-6,6/PNIPAAm composite membranes were constructed by integrating a hydrophobic PVDF cast layer and hydrophilic nylon-6,6/PNIPAAm nanofiber layer where trypsin enzymes were covalently immobilized. The immobilization density of enzymes on the membrane surface decreased with increasing PNIPAAm concentration, due to the decreased number of amine functional sites. Through a ultrafiltration study using a model solution containing BSA/NaCl/CaCl2, the PNIPAAm containing biocatalytic membranes demonstrated a combined effect of enzymatic and thermo-switchable self-cleaning. The membrane without PNIPAAm revealed superior fouling resistance and self-cleaning with an RPD of 22%, compared to membranes with 2 and 4 wt% PNIPAAm with 26% and 33% RPD, respectively, after an intermediate temperature cleaning at 50& deg C, indicating that higher enzyme density offers more efficient self-cleaning than the combined effect of enzyme and PNIPAAm at low concentration. The conformational volume phase transition of PNIPAAm did not affect the stability of immobilized trypsin on membrane surface. Such novel surface engineering design offer a promising route to severe surface-protein contamination remediation in food and wastewater applications.
Economic analysis of desalination technologies in the context of carbon pricing, and opportunities for membrane distillation
Publisher: Elsevier BV
Date: 08-2013
Impact of casting conditions on PVDF/nanoclay nanocomposite membrane properties
Publisher: Elsevier BV
Date: 05-2015
Carbonised template molecular sieve silica membranes in fuel processing systems: permeation, hydrostability and regeneration
Publisher: Elsevier BV
Date: 10-2004
Control of porosity and pore size of metal reinforced carbon nanotube membranes
Publisher: MDPI AG
Date: 21-12-2010
Prototype membrane electrolysis using a MFI-zeolite-coated ceramic tubular membrane provides in-line generation of two active electron mediators by eliminating active species crossover
Publisher: Elsevier BV
Date: 06-2019
Hydrothermally Robust Molecular Sieve Silica for Wet Gas Separation
Publisher: Wiley
Date: 06-06-2006
Advanced oxidation of orange G using phosphonic acid stabilised zerovalent iron
Publisher: Elsevier BV
Date: 08-2017
Fouling mechanisms and reduced chemical potential of ceramic membranes combined with ozone
Publisher: IWA Publishing
Date: 12-2015
DOI: 10.2166/WPT.2015.100
Abstract: Combining ceramic membranes with ozonation and allowing ozone residual to contact the membrane surface is well known to control fouling, allowing for higher membrane fluxes. This means that the more robust, longer lasting and higher integrity ceramic material can potentially be used in water recycling in a cost competitive way. This paper presents additional results from a previously reported ozonation/ceramic membrane trial in Melbourne, Australia. The results assisted in understanding the cause of the high fluxes by quenching the residual ozone upstream of the membrane, to isolate its effects on organic species from those on the membrane. Ozone quenching was directly attributed to lost membrane performance which confirmed that ozone has a direct effect on the membrane which contributes to the higher fluxes. Tests to reduce cleaning chemical use (sodium hypochlorite) at high fluxes were also conducted. Sodium hypochlorite consumption generally was not significant, but trading better stability and higher fluxes for reduced chemical use needs to be justified. Ceramic membranes coupled with pre-ozonation exhibit unique properties in water treatment, offering potential advantages such as increased backwash disinfection, as well as higher flux rates or reduced chemical consumption.
Scale‐up of molecular sieve silica membranes for reformate purification
Publisher: Wiley
Date: 14-09-2004
DOI: 10.1002/AIC.10200
Integrated ultrafiltration process for the recovery of bromelain from pineapple waste mixture
Publisher: Wiley
Date: 24-10-2017
DOI: 10.1111/JFPE.12492
A Pervaporation Study of Ammonia Solutions Using Molecular Sieve Silica Membranes
Publisher: MDPI AG
Date: 17-02-2014
Performance of cobalt silica membranes in gas mixture separation
Publisher: Elsevier BV
Date: 05-03-2009
Temperature and Pressure Effects of Desalination Using a MFI-Type Zeolite Membrane
Publisher: MDPI AG
Date: 17-07-2013
Preparation and characterization of poly(vinylidene fluoride)/nanoclay nanocomposite flat sheet membranes for abrasion resistance
Publisher: Elsevier BV
Date: 06-2014
DOI: 10.1016/J.WATRES.2014.03.005
Abstract: Membranes with more resilience to abrasive wear are highly desired in water treatment, especially for seawater desalination. Nanocomposite poly(vinylidene fluoride) (PVDF)/nanoclay membranes were prepared by phase inversion and then tested for abrasion resistance. Their material properties were characterized using Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), tensile testing, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Nanoclay Cloisite(®) 15A was utilised as the inorganic nanoparticle incorporated into PVDF. FTIR results showed a shifting of the PVDF crystalline phase from α to β thus indicating that the nanoclay altered the PVDF host material's structure and mechanical properties in terms of stiffness and toughness. Water permeation test showed that nanoclay at low concentration tended to reduce water flux. All nanocomposite membranes, with between 1 wt% and 5 wt% initial nanoclay loading, were more abrasion resistant than the control PVDF membrane. However, the 1 wt% exhibited superior resistance, lasting two times longer than the reference PVDF membrane under the same abrasive condition. The 1 wt% nanoclay membrane appeared less abraded by SEM observation, while also having the greatest tensile strength improvement (from 4.5 MPa to 4.9 MPa). This membrane also had the smallest agglomerated nanoclay particle size and highest toughness compared to the higher nanoclay content membranes. Nanoclays are therefore useful for improving abrasion resistance of PVDF membranes, but optimal loadings are essential to avoid losing essential mechanical properties.
Membrane distillation and membrane electrolysis of coal seam gas reverse osmosis brine for clean water extraction and NaOH production
Publisher: Elsevier BV
Date: 11-2016
Removal of herbicide 2-methyl-4-chlorophenoxyacetic acid (MCPA) from saline industrial wastewater by reverse osmosis and nanofiltration
Publisher: Elsevier BV
Date: 12-2020
Membrane scaling and prevention techniques during seawater desalination by air gap membrane distillation
Publisher: Elsevier BV
Date: 11-2016
A Preliminary Study on the Effect of Macro Cavities Formation on Properties of Carbon Nanotube Bucky-Paper Composites
Publisher: MDPI AG
Date: 10-03-2011
DOI: 10.3390/MA4030553
Investigation of the effects of ion and water interaction on structure and chemistry of silicalite MFI type zeolite for its potential use as a seawater desalination membrane
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/B926455H
The combined effects of diet, environment and genetics on pigmentation in the Giant Tiger Prawn, Penaeus monodon
Publisher: Elsevier BV
Date: 12-2015
Application of robust MFI-type zeolite membrane for desalination of saline wastewater
Publisher: Elsevier BV
Date: 02-2015
Changes in glucose fermentation pathways by an enriched bacterial culture in response to regulated dissolved H2 concentrations
Publisher: Wiley
Date: 18-04-2015
DOI: 10.1002/BIT.25525
Abstract: It is well established that metabolic pathways in the fermentation of organic waste are primarily controlled by dissolved H2 concentrations, but there is no reported study that compares observed and predicted shifts in fermentation pathways induced by manipulating the dissolved H2 concentration. A perfusion system is presented that was developed to control dissolved H2 concentrations in the continuous fermentation of glucose by a culture highly enriched towards Thermoanaerobacterium thermosaccharolyticum (86 ± 9% relative abundance) from an originally erse consortia in the leachate of a laboratory digester fed with municipal solid waste. Media from a 2.5 L CSTR was drawn through sintered steel membrane filters to retain biomass, allowing vigorous sparging in a separate chamber without cellular disruption. Through a combination of sparging and variations in glucose feeding rate from 0.8 to 0.2 g/L/d, a range of steady state fermentations were performed with dissolved H2 concentrations as low as an equivalent equilibrated H2 partial pressure of 3 kPa. Trends in product formation rates were simulated using a H2 regulation partitioning model. The model correctly predicted the direction of products redistribution in response to H2 concentration changes and the acetate and butyrate formation rates when H2 concentrations were less than 6 kPa. However, the model over-estimated acetate, ethanol and butanol productions at the expense of butyrate production at higher H2 concentrations. The H2 yield at the lowest dissolved H2 concentration was 2.67 ± 0.08 mol H2 /mol glucose, over 300% higher than the yield achieved in a CSTR operated without sparging.
Towards Enhanced Performance Thin-film Composite Membranes via Surface Plasma Modification
Publisher: Springer Science and Business Media LLC
Date: 07-2016
DOI: 10.1038/SREP29206
Abstract: Advancing the design of thin-film composite membrane surfaces is one of the most promising pathways to deal with treating varying water qualities and increase their long-term stability and permeability. Although plasma technologies have been explored for surface modification of bulk micro and ultrafiltration membrane materials, the modification of thin film composite membranes is yet to be systematically investigated. Here, the performance of commercial thin-film composite desalination membranes has been significantly enhanced by rapid and facile, low pressure, argon plasma activation. Pressure driven water desalination tests showed that at low power density, flux was improved by 22% without compromising salt rejection. Various plasma durations and excitation powers have been systematically evaluated to assess the impact of plasma glow reactions on the physico-chemical properties of these materials associated with permeability. With increasing power density, plasma treatment enhanced the hydrophilicity of the surfaces, where water contact angles decreasing by 70% were strongly correlated with increased negative charge and smooth uniform surface morphology. These results highlight a versatile chemical modification technique for post-treatment of commercial membrane products that provides uniform morphology and chemically altered surface properties.
Towards integrated anti-microbial capabilities: Novel bio-fouling resistant membranes by high velocity embedment of silver particles
Publisher: Elsevier BV
Date: 02-2015
Energetics for gas separation in microporous membranes
Publisher: Inderscience Publishers
Date: 2007
Nanofiber Composite Membrane with Intrinsic Janus Surface for Reversed-Protein-Fouling Ultrafiltration.
Publisher: American Chemical Society (ACS)
Date: 16-05-2017
Abstract: Janus nanofiber based composite ultrafiltration (UF) membranes were fabricated via a two-step method, i.e., consecutive electrospinning of hydrophilic nylon-6,6/chitosan nanofiber blend and conventional casting of hydrophobic poly(vinylidene difluoride) (PVDF) dope solution. The as-developed PVDF/nylon-6,6/chitosan membranes were investigated for its morphology using Scanning Electron Microscopy (SEM) by which 18 wt % PVDF was chosen as the optimum base polymer concentration due to optimal degree of integration of cast and nanofiber layers. This membrane was benchmarked against the pure PVDF and PVDF/nylon-6,6 membranes in terms of surface properties, permeability, and its ability to reverse protein fouling. The improved hydrophilicity of the PVDF/nylon-6,6/chitosan membrane was revealed from the 72% reduction in the initial water contact angle compared to the pure PVDF benchmark, due to the incorporation of intrinsic hydrophilic hydroxyl and amine functional groups on the membrane surface confirmed by FTIR. The integration of the nanofiber and cast layers has led to altered pore arrangements offering about 93% rejection of bovine serum albumin (BSA) proteins with a permeance of 393 L·m
A hybrid photocatalysis and ceramic membrane filtration process for humic acid degradation: Effect of pore size and transmembrane pressure
Publisher: Desalination Publications
Date: 2017
Recovery of sulphuric acid from waste and process solutions using solvent extraction
Publisher: Elsevier BV
Date: 06-2013
Flowfields on feed and permeate sides of tubular molecular sieving silica (MSS) membranes
Publisher: Elsevier BV
Date: 08-2007
Carbonised template silica membranes for desalination
Publisher: Elsevier BV
Date: 2009
Characterization and evaluation of carbon nanotube Bucky-Paper membranes for direct contact membrane distillation
Publisher: Elsevier BV
Date: 04-2010
A method for defect repair of MFI-type zeolite membranes by multivalent ion infiltration
Publisher: Elsevier BV
Date: 2017
Hybrid Processes Combining Photocatalysis and Ceramic Membrane Filtration for Degradation of Humic Acids in Saline Water
Publisher: MDPI AG
Date: 03-2016
Exposing the Molecular Sieving Architecture of Amorphous Silica Using Positron Annihilation Spectroscopy
Publisher: Wiley
Date: 08-12-2008
Seawater desalination performance of MFI type membranes made by secondary growth
Publisher: Elsevier BV
Date: 08-2009
Mixed Matrix Carbon Molecular Sieve and Alumina (CMS-Al 2 O 3) Membranes
Publisher: Springer Science and Business Media LLC
Date: 29-07-2016
DOI: 10.1038/SREP30703
Abstract: This work shows mixed matrix inorganic membranes prepared by the vacuum-assisted impregnation method, where phenolic resin precursors filled the pore of α-alumina substrates. Upon carbonisation, the phenolic resin decomposed into several fragments derived from the backbone of the resin matrix. The final stages of decomposition ( °C) led to a formation of carbon molecular sieve (CMS) structures, reaching the lowest average pore sizes of ~5 Å at carbonisation temperatures of 700 °C. The combination of vacuum-assisted impregnation and carbonisation led to the formation of mixed matrix of CMS and α-alumina particles (CMS-Al 2 O 3 ) in a single membrane. These membranes were tested for pervaporative desalination and gave very high water fluxes of up to 25 kg m −2 h −1 for seawater (NaCl 3.5 wt%) at 75 °C. Salt rejection was also very high varying between 93–99% depending on temperature and feed salt concentration. Interestingly, the water fluxes remained almost constant and were not affected as feed salt concentration increased from 0.3, 1 and 3.5 wt%.
Effects of dissolution conditions on the properties of PVDF ultrafiltration membranes
Publisher: Elsevier BV
Date: 11-2017
DOI: 10.1016/J.ULTSONCH.2017.05.041
Abstract: Poly (vinylidene fluoride) (PVDF) is an important membrane forming material for water treatment. Earlier works have shown that major morphological changes can be achieved when PVDF is dissolved under different conditions with practical applications in membrane distillation and protein attachment. However, no previous report has discussed the effects of dissolution conditions on the performance of PVDF under ultrafiltration, which is one of the most important applications of the polymer. In this work, four different PVDF ultrafiltration membranes were produced from dopes dissolved either by stirring at 24°C, 90°C, 120°C or by sonication. It is shown that dope sonication results in membrane with enhanced thermal and mechanical stability, improved permeate flux during oil emulsion filtration and high flux recovery of ∼63% after cleaning. As a comparison, flux recovery of only ∼26% was obtained for the membrane produced from dope dissolved at 24°C. The outstanding performance of the dope-sonicated membrane was linked to its slightly lower porosity, narrow distribution of small pores and relatively smooth skin layer. Performance parameters for all membranes showed good correlation to porosity suggesting a tool for membrane design achievable by simple variation in the mode of polymer dissolution. The polymer dissolution effect was related to the degree of unfolding of the polymer molecular chains and their entanglements.
Surface-Engineered Biocatalytic Composite Membranes for Reduced Protein Fouling and Self-Cleaning.
Publisher: American Chemical Society (ACS)
Date: 26-07-2018
Abstract: A new biocatalytic nanofibrous composite ultrafiltration membrane was developed to reduce protein fouling interactions and self-clean the membrane surface. The dual-layer poly(vinylidenefluoride)/nylon-6,6/chitosan composite membrane contains a hydrophobic poly(vinylidenefluoride) cast support layer and a hydrophilic functional nylon-6,6/chitosan nanofibrous surface layer where enzymes were chemically attached. The intrinsic surface chemistry and high surface area of the nanofibers allowed optimal and stable immobilization of trypsin (TR) and α-chymotrypsin enzymes via direct covalent binding. The enzyme immobilization was confirmed by X-ray photoelectron spectroscopy and visualized by confocal microscopy analysis. The prepared biocatalytic composite membranes were nanoporous with superior permeability offering stable protein antiadhesion and self-cleaning properties owing to the repulsive mechanism and digestion of proteins into peptides and amino acids, which was quantified by the gel electrophoresis technique. The TR-immobilized composite membranes exhibited 2.7-fold higher permeance and lower surface protein contamination with 3-fold greater permeance recovery, when compared to the pristine membrane after two ultrafiltration cycles with the model feed solution containing bovine serum albumin/NaCl/CaCl
Nanocomposites for Improved Physical Durability of Porous PVDF Membranes
Publisher: MDPI AG
Date: 24-02-2014
An analysis of the Peclet and Damkohler numbers for dehydrogenation reactions using molecular sieve silica (MSS) membrane reactors
Publisher: Elsevier BV
Date: 07-2006
Membrane Distillation Trial on Textile Wastewater Containing Surfactants Using Hydrophobic and Hydrophilic-Coated Polytetrafluoroethylene (PTFE) Membranes
Publisher: MDPI AG
Date: 15-06-2018
Abstract: Treating wastewater from textile plants using membrane distillation (MD) has great potential due to the high-salinity wastes and availability of waste heat. However, textile wastewaters also contain surfactants, which compromise the essential hydrophobic feature of the membrane, causing membrane wetting. To address this wetting issue, a custom-made membrane consisting of a hydrophilic layer coated on hydrophobic polytetrafluoroethylene (PTFE) was tested on textile wastewater in a pilot MD setup, and compared with a conventional hydrophobic PTFE membrane. The test was carried out with a feed temperature of 60 °C, and a permeate temperature of 45 °C. The overall salt rejection of both membranes was very high, at 99%. However, the hydrophobic membrane showed rising permeate electrical conductivity, which was attributed to wetting of the membrane. Meanwhile, the hydrophilic-coated membrane showed continually declining electrical conductivity demonstrating an intact membrane that resisted wetting from the surfactants. Despite this positive result, the coated membrane did not survive a simple sodium hydroxide clean, which would be typically applied to a membrane process. This brief study showed the viability of membrane distillation membranes on real textile wastewaters containing surfactants using hydrophilic-coated hydrophobic PTFE, but the cleaning process required for membranes needs optimization.
Seawater Use and Desalination Technology
Publisher: Elsevier
Date: 2011
Silica fouling during direct contact membrane distillation of coal seam gas brine with high sodium bicarbonate and low hardness
Publisher: Elsevier BV
Date: 10-2018
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