ORCID Profile
0000-0002-4902-5458
Current Organisation
Queensland University of Technology
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Chemical Engineering | Functional Materials | Membrane and Separation Technologies
Industrial Chemicals and Related Products not elsewhere classified | Industrial Energy Conservation and Efficiency |
Publisher: American Chemical Society (ACS)
Date: 27-09-2018
Publisher: Elsevier BV
Date: 04-1999
Publisher: Elsevier BV
Date: 10-2019
Publisher: Wiley
Date: 27-10-2011
DOI: 10.1002/JRS.3063
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier BV
Date: 02-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 1990
DOI: 10.1039/FT9908600571
Publisher: Royal Society of Chemistry (RSC)
Date: 1992
DOI: 10.1039/FT9928801033
Publisher: Elsevier BV
Date: 03-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 1992
DOI: 10.1039/FT9928802085
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 04-2019
Publisher: Elsevier BV
Date: 09-1995
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 05-2010
Publisher: Informa UK Limited
Date: 11-09-2015
Publisher: Elsevier BV
Date: 04-2018
Publisher: Informa UK Limited
Date: 07-1992
Publisher: Elsevier BV
Date: 05-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6EW00266H
Abstract: A robust method involving intermediate nanofiltration in a dual stage RO system to achieve high water recovery rates from coal seam water has been developed.
Publisher: Elsevier BV
Date: 12-1992
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 06-2016
Publisher: Elsevier BV
Date: 02-2017
Publisher: Informa UK Limited
Date: 06-12-2014
Publisher: American Chemical Society (ACS)
Date: 26-02-2014
DOI: 10.1021/IE403382Z
Publisher: Elsevier BV
Date: 03-2017
Publisher: Elsevier BV
Date: 2015
Publisher: Elsevier BV
Date: 08-2021
Publisher: Springer Science and Business Media LLC
Date: 14-02-2018
DOI: 10.1038/S41467-018-02871-3
Abstract: The inability of membranes to handle a wide spectrum of pollutants is an important unsolved problem for water treatment. Here we demonstrate water desalination via a membrane distillation process using a graphene membrane where water permeation is enabled by nanochannels of multilayer, mismatched, partially overlapping graphene grains. Graphene films derived from renewable oil exhibit significantly superior retention of water vapour flux and salt rejection rates, and a superior antifouling capability under a mixture of saline water containing contaminants such as oils and surfactants, compared to commercial distillation membranes. Moreover, real-world applicability of our membrane is demonstrated by processing sea water from Sydney Harbour over 72 h with macroscale membrane size of 4 cm 2 , processing ~0.5 L per day. Numerical simulations show that the channels between the mismatched grains serve as an effective water permeation route. Our research will pave the way for large-scale graphene-based antifouling membranes for erse water treatment applications.
Publisher: Wiley
Date: 08-09-2022
DOI: 10.1111/IJFS.16043
Abstract: Drying is a popular food preservation technology that reduces food waste and promotes food preservation and food security. Though drying reduces microbial growth and increases shelf life of fruits, it alters sensory properties both favourably and unfavourably depending on the nature of the drying process applied and significantly influences the final product quality. However, there is currently no review article on the impact of the drying process on the sensorial quality attributes of tropical fruits. This review attempts to describe the relative merits and challenges of some widely used advanced drying techniques with a particular focus on intermittent microwave convective drying (IMCD) techniques which offer high sensory properties with excellent drying efficiency. The paper aims to provide an insight into the effect of these drying techniques on the sensory qualities of tropical fruits to identify the best drying method for future food applications.
Publisher: Springer Science and Business Media LLC
Date: 1995
DOI: 10.1007/BF00808597
Publisher: Elsevier BV
Date: 08-2021
Publisher: Elsevier BV
Date: 10-2022
Publisher: Elsevier BV
Date: 03-2016
Publisher: Elsevier BV
Date: 06-1994
Publisher: Informa UK Limited
Date: 03-05-2016
Publisher: American Chemical Society (ACS)
Date: 1996
DOI: 10.1021/EF950227T
Publisher: Royal Society of Chemistry (RSC)
Date: 1995
DOI: 10.1039/FT9959104321
Publisher: BMJ
Date: 20-07-2017
DOI: 10.1136/BMJ.J2998
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 12-2014
Publisher: Royal Society of Chemistry (RSC)
Date: 1991
DOI: 10.1039/FT9918701491
Publisher: Elsevier BV
Date: 10-2020
Publisher: Springer Science and Business Media LLC
Date: 1996
DOI: 10.1007/BF01135362
Publisher: Elsevier BV
Date: 12-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 1993
DOI: 10.1039/JM9930300867
Publisher: Elsevier BV
Date: 09-2021
Publisher: Wiley
Date: 26-10-2018
Publisher: Elsevier BV
Date: 09-2019
Publisher: Elsevier BV
Date: 1996
Publisher: Elsevier BV
Date: 08-2018
Publisher: Elsevier BV
Date: 04-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 1995
DOI: 10.1039/FT9959100133
Publisher: Elsevier BV
Date: 12-2011
DOI: 10.1016/J.SAA.2011.09.040
Abstract: In order to mimic the chemical reactions in cave systems, the analogue of the mineral stercorite H(NH(4))Na(PO(4))·4H(2)O has been synthesised. X-ray diffraction of the stercorite analogue matches the stercorite reference pattern. A comparison is made with the vibrational spectra of synthetic stercorite analogue and the natural Cave mineral. The mineral in nature is formed by the reaction of bat guano chemicals on calcite substrates. A single Raman band at 920 cm(-1) (Cave) and 922 cm(-1) (synthesised) defines the presence of hydrogen phosphate in the mineral. In the synthetic stercorite analogue, additional bands are observed and are attributed to the dihydrogen and phosphate anions. The vibrational spectra of synthetic stercorite only partly match that of the natural stercorite. It is suggested that natural stercorite is more pure than that of synthesised stercorite. Antisymmetric stretching bands are observed in the infrared spectrum at 1052, 1097, 1135 and 1173 cm(-1). Raman spectroscopy shows the stercorite mineral is based upon the hydrogen phosphate anion and not the phosphate anion. Raman and infrared bands are found and assigned to PO(4)(3-), H(2)O, OH and NH stretching vibrations. Raman spectroscopy shows the synthetic analogue is similar to the natural mineral. A mechanism for the formation of stercorite is provided.
Publisher: Elsevier BV
Date: 06-2016
Publisher: MDPI AG
Date: 22-04-2021
DOI: 10.3390/MEMBRANES11050308
Abstract: Direct Contact Membrane Distillation (DCMD) is a promising and feasible technology for water desalination. Most of the models used to simulate DCMD are one-dimensional and/or use a linear function of vapour pressure which relies on experimentally determined parameters. In this study, the model of DCMD using Nusselt correlations was improved by coupling the continuity, momentum, and energy equations to better capture the downstream alteration of flow field properties. A logarithmic function of vapour pressure, which is independent from experiments, was used. This allowed us to analyse DCMD with different membrane properties. The results of our developed model were in good agreement with the DCMD experimental results, with less than 7% deviation. System performance metrics, including water flux, temperature, and concentration polarisation coefficient and thermal efficiency, were analysed by varying inlet feed and permeate temperature, inlet velocity, inlet feed concentration, channel length. In addition, twenty-two commercial membranes were analysed to obtain a real vision on the influence of membrane characteristics on system performance metrics. The results showed that the feed temperature had the most significant effect on water flux and thermal efficiency. The increased feed temperature enhanced the water flux and thermal efficiency however, it caused more concentration and temperature polarisation. On the other hand, the increased inlet velocity was found to provide increased water flux and reduced temperature and concertation polarisation as well. It was also found that the membrane properties, especially thickness and porosity, can affect the DCMD performance significantly. A two-fold increase of feed temperature increased the water flux and thermal efficiency, 10-fold and 27%, respectively however, it caused an increase in temperature and concertation polarisation, at 48% and 34%, respectively. By increasing Reynolds number from 80 to 1600, the water flux, CPC, and TPC enhanced by 2.3-fold, 2%, and 21%, respectively. The increased feed concentration from 0 to 250 [g/L] caused a 26% reduction in water flux. To capture the downstream alteration of flow properties, it was shown that the ratio of inlet value to outlet value of system performance metrics decreased significantly throughout the module. Therefore, improvement over the conventional model is undeniable, as the new model can assist in achieving optimal operation conditions.
Publisher: Royal Society of Chemistry (RSC)
Date: 1993
DOI: 10.1039/FT9938901109
Publisher: Elsevier BV
Date: 06-2016
Publisher: Elsevier BV
Date: 03-2022
Publisher: Elsevier BV
Date: 03-2023
Publisher: Elsevier BV
Date: 06-2022
Publisher: Elsevier BV
Date: 04-2017
Publisher: American Chemical Society (ACS)
Date: 16-01-2013
DOI: 10.1021/IE301618P
Publisher: Elsevier BV
Date: 12-2019
DOI: 10.1016/J.JES.2019.04.023
Abstract: This study revealed the relationship between the presence of calcium impurities and ammoniacal nitrogen concentration upon crystallization of struvite. The research hypothesis was that the presence of both calcium and high concentrations of ammoniacal nitrogen (328-1000 mg/L) in waste activated sludge may influence the struvite quality and acid stability. Hence, we studied the impact of Ca:Mg ratio upon morphology, particle size, purity and dissolution of struvite, in the presence of varying levels of excess ammoniacal nitrogen. X-ray diffraction revealed that up to 31.4% amorphous material was made which was assigned to hydroxyapatite. Increasing the ammoniacal nitrogen concentration and elevation of the Mg:Ca ratio maximized the presence of struvite. Struvite particle size was also increased by ammoniacal nitrogen as was twinning of the crystals. Tests with dilute solutions of organic acid revealed the sensitivity of struvite dissolution to the physical characteristics of the struvite. Smaller particles (21.2 μm) dissolved at higher rates than larger particles (35.86 μm). However, struvite dissolved rapidly as the pH was further reduced irrespective of the physical characteristics. Therefore, addition of struvite to low pH soils was not viewed as beneficial in terms of controlled nutrient release. Overall, this study revealed that waste activated sludge effluent with high ammoniacal nitrogen was prospective for synthesis of high quality struvite material.
Publisher: Elsevier BV
Date: 08-1995
Publisher: Elsevier BV
Date: 06-2018
Publisher: Elsevier BV
Date: 04-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 1994
DOI: 10.1039/FT9949002579
Publisher: Elsevier BV
Date: 11-2015
Publisher: Springer Science and Business Media LLC
Date: 28-01-2022
DOI: 10.1007/S00128-021-03434-X
Abstract: Bauxite residue is a highly alkaline waste from alumina refining, and is mainly disposed by stacking with high environmental risks. Here, the migration of alkaline constituents and the restoration evaluation with phosphogypsum were discussed by soil column experiments to investigate the alkaline regulation in bauxite residue disposal areas (BRDAs). The pH, free alkali, exchangeable sodium in the top layer (0-25 cm depth) covered with BR and phosphogypsum mixtures were reduced from 10.89 ± 0.02, 285.45 ± 21.15 mmol/kg, 385.63 ± 30.34 mg/kg to 9.00 ± 0.50, 12.50 ± 1.50 mmol/kg, 97.00 ± 10.50 mg/kg. For the sublayers, including depths of 35, 45, 55 cm, these values dropped to 9.86, 10.06, 10.03 38.23, 86.12, 148.00 mmol/kg 152.90, 246.00, 305.00 mg/kg, respectively. These results indicated alkaline indicators for phosphogypsum amended BR declined dramatically, and the parameters for sublayers were also decreased due to the migration of alkaline constituents. The physicochemical properties for amended BR could meet the conditions for plant growth. This research provided a reference for alkalinity regulation in BRDAs by phosphogypsum.
Publisher: Royal Society of Chemistry (RSC)
Date: 1998
DOI: 10.1039/A706730E
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7RA13348K
Abstract: A functional diatomite-supported Fe/Ni nanocomposite successfully remediated Orange II contaminant in aqueous solution.
Publisher: Royal Society of Chemistry (RSC)
Date: 1998
DOI: 10.1039/A802674B
Publisher: Elsevier BV
Date: 04-2012
Publisher: American Chemical Society (ACS)
Date: 08-1997
DOI: 10.1021/JP971366+
Publisher: Elsevier BV
Date: 07-1993
Publisher: Elsevier BV
Date: 07-1997
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 12-2022
DOI: 10.1016/J.CHEMOSPHERE.2022.136237
Abstract: Membrane cleaning is critical for economic and scientific reasons in wastewater treatment systems. Sodium docusate is a laxative agent and removes cerumen (ear wax). Docusate penetrates the hard ear wax, making it softer and easier to remove. The same concept could be applied to soften and remove fouling layers on the membrane surface. Once softened, the foulants can be easily flushed with water. This innovative approach can address the challenge of developing superior methods to mitigate membrane fouling and material degradation. In this study, we evaluated the efficiency of sodium docusate for cleaning fouled forward osmosis membranes with real landfill leachate wastewater. Experiments were conducted to examine the impact of dose rate, contact time, flow or static conditions, and process configuration (forward osmosis (FO) or pressure retarded osmosis (PRO) upon fouling created by landfill leachate dewatering. A remarkable (99%) flux recovery was achieved using docusate at a small concentration of only 0.1% for 30 min. Furthermore, docusate can also effectively restore flux with static cleaning without using pumps to circulate the cleaning solution. Furthermore, cleaning efficiency can be achieved at neutral pH compatible with most membrane materials. From an economic and energy-saving perspective, static cleaning can almost achieve the same cleaning efficiency as kinetic cleaning for fouled forward osmosis membranes without the expense of additional pumping energy compared to kinetic cleaning. Since pumping energy is a major contributor to the overall energy of the forward osmosis system, it can be minimized to a certain degree by using a static cleaning approach and can bring good energy savings when using larger membrane areas. Studies of the contact angle on the membrane surface indicated that the contact angle was decreased compared to the fouled membrane after cleaning (e.g. 70.3° to 63.2° or FO mode and static cleaning). Scanning Electron Microscopy revealed that the cleaning strategy was successful. Infrared Spectroscopy showed that a small amount of sodium docusate remained on the membrane surface. Docusate is more environmentally friendly than acid or alkaline solutions from an environmental perspective. Furthermore, the cleaning solution can be reused for several cycles without discarding it due to the surfactant properties of docusate.
Publisher: Elsevier BV
Date: 04-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 1998
DOI: 10.1039/A703954I
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 06-2017
Publisher: Elsevier BV
Date: 06-2017
Publisher: Elsevier BV
Date: 08-2022
Publisher: Elsevier BV
Date: 10-2022
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 09-1996
Publisher: Wiley
Date: 08-1993
Publisher: Elsevier BV
Date: 2012
DOI: 10.1016/J.SAA.2011.09.057
Abstract: Some minerals are colloidal and show no X-ray diffraction patterns. Vibrational spectroscopy offers one of the few methods for the determination of the structure of these minerals. Among this group of minerals is pitticite, simply described as (Fe, AsO(4), SO(4), H(2)O). In this work, the analogue of the mineral pitticite has been synthesised. The objective of this research is to determine the molecular structure of the mineral pitticite using vibrational spectroscopy. Raman and infrared bands are attributed to the AsO(4)(3-), SO(4)(2-) and water stretching and bending vibrations. The Raman spectrum of the pitticite analogue shows intense peaks at 845 and 837cm(-1) assigned to the AsO(4)(3-) stretching vibrations. Raman bands at 1096 and 1182cm(-1) are attributed to the SO(4)(2-) antisymmetric stretching bands. Raman spectroscopy offers a useful method for the analysis of such colloidal minerals.
Publisher: Springer Science and Business Media LLC
Date: 1996
DOI: 10.1007/BF00806896
Publisher: Elsevier BV
Date: 05-2016
Publisher: Elsevier BV
Date: 12-2023
Publisher: Informa UK Limited
Date: 10-09-2018
Publisher: Elsevier BV
Date: 04-2021
Publisher: Wiley
Date: 15-07-2019
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 11-1995
Publisher: Elsevier BV
Date: 03-2015
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 05-2016
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 10-2019
Publisher: Springer Science and Business Media LLC
Date: 05-1996
DOI: 10.1007/BF02431180
Publisher: Royal Society of Chemistry (RSC)
Date: 1992
DOI: 10.1039/FT9928801477
Publisher: Elsevier BV
Date: 2023
Publisher: Royal Society of Chemistry (RSC)
Date: 1992
DOI: 10.1039/FT9928803497
Publisher: Elsevier BV
Date: 10-2016
Publisher: Wiley
Date: 21-09-2018
Publisher: Springer Science and Business Media LLC
Date: 02-2019
Publisher: Informa UK Limited
Date: 2013
Publisher: Verlag Dr. Albert Bartens KG
Date: 05-05-2023
DOI: 10.36961/SI29817
Abstract: During evaporation, the loss of sucrose can occur due to acid-catalysed hydrolysis to glucose and fructose, a reaction that is exponential with temperature. This paper reviews non-thermal methods for concentrating juices, mainly focusing on the developments of forward osmosis (FO) membranes for juice processing, detailing the benefits and limitations of this technology. A laboratory FO membrane was used in this preliminary study to concentrate pure sucrose solutions and clarified juice from ~10 to 45% rds using a calcium chloride draw solution. A small amount of reverse salt flux was observed. The non-sucrose substances in factory juices had little impact on flux performance, with the flux reducing inversely with the volumetric concentration factor. By concentrating to a limit of 45% rds, concentration polarisation factors that can have a detrimental impact on the flux were not realised. Possible strategies were also explored for the integration into the sugar-manufacturing process.
Publisher: Royal Society of Chemistry (RSC)
Date: 1991
DOI: 10.1039/FT9918702795
Publisher: Informa UK Limited
Date: 19-02-2016
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 10-2020
Publisher: American Chemical Society (ACS)
Date: 10-08-2017
Publisher: Springer Science and Business Media LLC
Date: 05-1996
DOI: 10.1038/381379A0
Abstract: Reverse transcriptases (RTs) catalyze the polymerization of DNA from an RNA template. These enzymes were first discovered in RNA tumor viruses in 1970, but it was not until 1989 that they were found in prokaryotes as a key component of retrons. Apart from RTs encoded by the 'selfish' mobile retroelements known as group II introns, prokaryotic RTs are extraordinarily erse, but their function has remained elusive. However, recent studies have revealed that different lineages of prokaryotic RTs, including retrons, those associated with CRISPR-Cas systems, Abi-like RTs and other yet uncharacterized RTs, are key components of different lines of defense against phages and other mobile genetic elements. Prokaryotic RTs participate in various antiviral strategies, including abortive infection (Abi), in which the infected cell is induced to commit suicide to protect the host population, adaptive immunity, in which a memory of previous infection is used to build an efficient defense, and other as yet unidentified mechanisms. These prokaryotic enzymes are attracting considerable attention, both for use in cutting-edge technologies, such as genome editing, and as an emerging research topic. In this review, we discuss what is known about prokaryotic RTs, and the exciting evidence for their domestication from retroelements to create specialized defense systems.
Publisher: Elsevier BV
Date: 2023
Publisher: Royal Society of Chemistry (RSC)
Date: 1991
DOI: 10.1039/FT9918701467
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 2020
Publisher: Elsevier BV
Date: 12-2018
Publisher: Springer Science and Business Media LLC
Date: 1993
DOI: 10.1007/BF01061096
Publisher: Wiley
Date: 03-1997
DOI: 10.1002/(SICI)1097-0029(19970301)36:5<382::AID-JEMT8>3.0.CO;2-N
Abstract: Okra pectins (OKPs) with erse structures obtained by different extraction protocols have been used to study the relationship between their molecular structure and emulsifying properties. A targeted modification of molecular structure offers a more rigorous method for investigating the emulsifying properties of pectins. In this study, three glycoside hydrolases, polygalacturonase (PG), galactanase (GL), and arabinanase (AR), and their combinations, were used to modify the backbone and side-chains of OKP, and the relationships between the pectin structure and emulsion characteristics were examined by multivariate analysis. Enzymatic treatment significantly changed the molecular structure of OKP, as indicated by monosaccharide composition, molecular weight, and structure analysis. GL- and AR- treatments reduced side-chains, while PG-treatment increased side-chain compositions in pectin structure. We compared the performance of hydrolyzed pectins in stabilizing emulsions containing 50%
Publisher: American Chemical Society (ACS)
Date: 1996
DOI: 10.1021/IE950702A
Publisher: Elsevier BV
Date: 03-2019
DOI: 10.1016/J.JES.2018.05.016
Abstract: Reduction of the high alkalinity of bauxite residue is a key problem to solve to make it suitable for plant growth and comprehensive utilization. In this study, phosphogypsum, a waste product from the phosphate fertilizer industry, was used to drive the alkaline transformation of the bauxite residue. Under optimal water washing conditions (liquid/solid ratio of 2 mL/g, 30°C, 24 hr), the impact of quantity added, reaction time and reaction mechanism during phosphogypsum application were investigated. Phosphogypsum addition effectively lowered pH levels and reduced the soluble alkalinity by 92.2%. It was found that the concentration of soluble Na and Ca ions in the supernatant increased gradually, whilst the exchangeable Na
Publisher: Elsevier BV
Date: 10-2019
Publisher: Elsevier BV
Date: 12-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 1994
DOI: 10.1039/C39940000525
Publisher: Elsevier BV
Date: 02-06-2000
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 11-2020
Publisher: SAGE Publications
Date: 07-1994
Abstract: An in situ infrared cell capable of studying reactions over heterogeneous catalysts in the temperature range 77 to 773 K has been designed. In particular, the adsorption of formic acid on a model Cu/SiO 2 methanol synthesis catalyst was investigated. Exposure of a reduced copper surface to formic acid at 300 K resulted in the formation of both formic acid molecules, which were ligated to the copper catalyst, and chemisorbed bidentate copper formate species. Under temperature-programming conditions, the bidentate species displayed a maximum rate of desorption at 433 K, which correlates to a desorption activation energy of 120 kJ mol −1 . In contrast, on the reoxidized catalyst, unidentate formate species were preferentially formed. These exhibited a maximum rate of desorption at a temperature of 408 K, and a desorption activation energy of 113 kJ mol −1 . A mechanism was postulated to explain this behavior, and evidence was presented to show that useful kinetic data can be obtained for desorption from a catalyst in the form of a pressed disk.
Publisher: Royal Society of Chemistry (RSC)
Date: 1991
DOI: 10.1039/FT9918702785
Publisher: Elsevier BV
Date: 02-2015
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier BV
Date: 06-2017
Publisher: Elsevier BV
Date: 04-2022
Publisher: Elsevier BV
Date: 03-2021
Publisher: CSIRO Publishing
Date: 2013
DOI: 10.1071/EN13048
Abstract: Environmental context Although land remediation programs for bauxite residues aim at vegetation coverage, the stability of compounds in the residues with acids produced by the vegetation has not been investigated. We show that, despite the instability of caustic components in the residues (negative effects on plant development), this instability actually assists in neutralising acidic soils. These results further affirm the suitability and sustainability of current land remediation programs for bauxite residues in terms of minimising acidic soil formation. Abstract This investigation used a combination of techniques, such as X-ray diffraction, inductively coupled plasma optical emission spectroscopy and infrared spectroscopy, to determine the dissolution mechanisms of the Bayer precipitate and the associated rate of dissolution in acetic, citric and oxalic acid environments. The Bayer precipitate is a mixture of hydrotalcite, calcium carbonate and sodium chloride that forms during the seawater neutralisation of Bayer liquors (waste residue of the alumina industry). The dissolution rate of a Bayer precipitate is found to be dependent on (1) the strength of the organic acid and (2) the number of donating H+ ions. The dissolution mechanism for a Bayer precipitate consists of several steps involving: (1) the dissolution of CaCO3, (2) formation of whewellite (calcium oxalate) when oxalic acid is used and (3) multiple dissolution steps for hydrotalcite that are highly dependent on the pH of solution. The decomposition of the Al–OH hydrotalcite layers resulted in the immediate formation of Al(OH)3, which is stable until the pH decreases below 5.5. This investigation has found that the Bayer precipitate is stable across a wide pH range in the presence of common organic acids found in the rhizosphere, and that initial decomposition steps are likely to be beneficial in supporting plant growth through the release of nutrients such as Ca2+ and Mg2+.
Publisher: American Chemical Society (ACS)
Date: 10-1993
DOI: 10.1021/CM00034A022
Publisher: Elsevier BV
Date: 10-2014
Publisher: Elsevier BV
Date: 04-2019
Publisher: Elsevier BV
Date: 03-2012
Publisher: Elsevier BV
Date: 04-2017
Publisher: Elsevier BV
Date: 02-2016
Publisher: Elsevier BV
Date: 2021
Publisher: Springer Science and Business Media LLC
Date: 26-04-2017
Publisher: Elsevier BV
Date: 12-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 1994
DOI: 10.1039/C39940001717
Publisher: Elsevier BV
Date: 09-2021
Publisher: Desalination Publications
Date: 2018
Publisher: Springer Science and Business Media LLC
Date: 02-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 1992
DOI: 10.1039/FT9928802257
Publisher: Royal Society of Chemistry (RSC)
Date: 1995
DOI: 10.1039/FT9959104149
Publisher: Springer Science and Business Media LLC
Date: 1992
DOI: 10.1007/BF00769666
Publisher: Springer Science and Business Media LLC
Date: 08-06-2018
Publisher: Elsevier BV
Date: 2023
Publisher: Springer Science and Business Media LLC
Date: 1997
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 12-2017
End Date: 12-2023
Amount: $4,000,000.00
Funder: Australian Research Council
View Funded Activity