ORCID Profile
0000-0001-8113-6556
Current Organisation
RMIT University
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Chemical Engineering | Polymers and Plastics | Membrane and Separation Technologies
Management of Greenhouse Gas Emissions from Energy Activities (excl. Electricity Generation) | Management of Greenhouse Gas Emissions from Electricity Generation | Water Services and Utilities |
Publisher: Informa UK Limited
Date: 19-10-2018
Publisher: Wiley
Date: 18-07-2019
Publisher: Elsevier BV
Date: 11-2013
Publisher: Elsevier BV
Date: 03-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6TA07350F
Abstract: A graphene oxide (GO)–polymer nanocomposite membrane was fabricated by integrating GO nanosheets into a highly crosslinked polymer network on a porous polymer substrate for desalination.
Publisher: Elsevier BV
Date: 2015
Publisher: American Chemical Society (ACS)
Date: 03-03-2014
DOI: 10.1021/JP411612G
Abstract: Recently, high free volume polymer materials have been regarded as high potential candidates for gas transport/separation membranes, since the amount of free volume in polymeric membrane can improve the diffusivity and solubility of gas molecules. In this study, we focused on how local changes in polymer structure can affect the performance of a membrane at the molecular level. The transport behavior was theoretically analyzed, and then the differences in the amount and morphology of free volume were characterized. Finally, we suggested how the "evolution of microcavities" affects the gas transport properties of hydroxyl-containing polyimide (HPI) and thermally rearranged (TR) polymers. In particular, using image analysis, we intuitively demonstrate the morphological difference between HPI and TR polymers that have been indirectly explained by experimental analyses using a wide-angle X-ray diffractometer (WAXD) and positron annihilation laser spectroscopy (PALS). Solubility results using the grand canonical Monte Carlo (GCMC) method showed marginal improvement in thermally rearranged polybenzoxazoles (TR-PBOs) from its precursor HPI, which is in good agreement with the experimental tendency. Moreover, higher diffusivities but lower selectivities of TR-PBO models compared with those of HPI models were observed, as reported experimentally. The difference in gas transport abilities between HPIs and TR-PBOs originates from the difference in their diffusion behavior, and this is strongly related to the free volume amount and morphology of polymeric materials. In addition to the higher amount of total free volume in TR-PBO, our image analysis revealed that TR-PBO has a higher amount of interconnected "hourglass-shaped free volume elements", which consist of larger and more elongated cavities with bottlenecks than the HPI model. In particular, the bottleneck diameters in the TR-PBO models are wider than those in the HPI models, enabling the larger gas molecules to diffuse through the cavities faster. However, the narrower and smaller bottleneck diameters in the HPI model can induce better selectivity for large gas molecules.
Publisher: Elsevier BV
Date: 08-2019
Publisher: Elsevier BV
Date: 03-2014
Publisher: Elsevier BV
Date: 05-2021
Publisher: Elsevier BV
Date: 2022
Publisher: Elsevier BV
Date: 05-2013
Publisher: Elsevier BV
Date: 04-2015
Publisher: Elsevier BV
Date: 05-2013
Publisher: MDPI AG
Date: 29-04-2021
DOI: 10.3390/MEMBRANES11050325
Abstract: In recent years, many industry sectors have recognised the importance of sustainable energy, reducing energy consumption and efficient production [...]
Publisher: American Chemical Society (ACS)
Date: 03-01-2017
Publisher: Elsevier BV
Date: 03-2018
Publisher: Springer Science and Business Media LLC
Date: 23-06-2012
Publisher: Elsevier BV
Date: 03-2014
Publisher: Elsevier BV
Date: 09-2018
Publisher: Wiley
Date: 11-11-2018
Abstract: Amino functionalized boron nitride nanosheets (FBN) were incorporated into a crosslinked, thermally rearranged polyimide (XTR) to fabricate FBN-XTR nanocomposite membrane. The FBN-XTR membrane exhibited a small decrease in H
Publisher: Elsevier BV
Date: 08-2013
Publisher: Wiley
Date: 17-07-2022
Abstract: Polytetrafluoroethylene (PTFE) nanofiber membranes with novel crosshatched structures are developed and applied to both water desalination by direct contact membrane distillation (MD) and CO 2 separation by membrane gas absorption. Crosshatched structures are produced from a PTFE‐poly(ethylene oxide)(PEO) emulsion by depositing alternating layers of aligned fibers oriented in perpendicular directions. This is followed by sintering to remove the PEO and to stabilize the structure. The crosshatched structure allows for rapid gas and vapor transport due to the low tortuosity and high porosity, leading to fast and effective separation. PTFE nanofiber membranes with these novel structures are ideal for membrane CO 2 stripping as this polymer is inherently strong and very hydrophobic. The mass transfer in both MD and CO 2 stripping is greatly improved in the crosshatched nanofibers (CNF) as well as in composite membranes with microparticles (CNF‐MP), as compared with conventional random nanofibers. The membranes exhibit a MD flux up to 98.5 ± 1.2 kg m −2 h −1 , significantly greater than a standard PTFE membrane with asymmetric morphology, when tested with a 3.5 wt% sodium chloride feed solution at 80 °C in direct contact with water at 20 °C.
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2CP23729F
Abstract: Microporous materials have a great importance in catalysis, delivery, storage and separation in terms of their performance and efficiency. Most microporous materials are comprised of inorganic frameworks, while thermally rearranged (TR) polymers are a microporous organic polymer which is tuned to optimize the cavity sizes and distribution for difficult separation applications. The sub-nano sized microcavities are controlled by in situ thermal treatment conditions which have been investigated by positron annihilation lifetime spectroscopy (PALS). The size and relative number of cavities increased from room temperature to 230 °C resulting in improvements in both permeabilities and selectivities for H(2)/CO(2) separation due to the significant increase of gas diffusion and decrease of CO(2) solubility. The highest performance of the well-tuned TR-polymer membrane was 206 Barrer for H(2) permeability and 6.2 of H(2)/CO(2) selectivity, exceeding the polymeric upper bound for gas separation membranes.
Publisher: Elsevier BV
Date: 07-2019
Publisher: Wiley
Date: 10-07-2018
Abstract: Regenerable, high-efficiency salt sorption materials are highly desirable for water treatment. Here, a thermoresponsive, hoteric metal-organic framework (MOF) material is reported that can adsorb multiple salts from saline water at room temperature and effectively release the adsorbed salts into water at elevated temperature (e.g., 80 °C). The hoteric MOF, integrated with both cation-binding carboxylic groups and anion-binding tertiary amine groups, is synthesized by introducing a polymer with tertiary amine groups into the cavities of a water-stable MOF such as MIL-121 with carboxylic groups inside its frameworks. The hoterized MIL-121 exhibits excellent salt adsorption properties, showing stable adsorption-desorption cycling performances and high LiCl, NaCl, MgCl
Publisher: Elsevier BV
Date: 02-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TA02256A
Abstract: A 2D scaffold of graphene oxide is formed inside a polymer to assist the fabrication of a defect-free and ultrathin ( nm) selective layer of thermally rearranged polybenzoxazole- co -imide membrane for energy-efficient CO 2 separation.
Publisher: Springer International Publishing
Date: 2012
Publisher: American Chemical Society (ACS)
Date: 09-2010
DOI: 10.1021/MA101549Z
Publisher: Elsevier BV
Date: 04-2015
Publisher: Elsevier BV
Date: 06-2012
Publisher: American Chemical Society (ACS)
Date: 24-04-2013
DOI: 10.1021/IE3034027
Publisher: American Chemical Society (ACS)
Date: 29-05-2018
Abstract: Carbon molecular sieve (CMS) membranes have shown great potential for gas separation owing to their low cost, good chemical stability, and high selectivity. However, most of the conventional CMS membranes exhibit low gas permeance due to their thick active layer, which limits their practical applications. Herein, we report a new strategy for fabricating CMS membranes with a 100 nm-thick ultrathin active layer using poly(furfuryl alcohol) (PFA) as a carbon precursor and carbon nanotubes (CNTs) as nanoscaffolds. CNT networks are deposited on a porous substrate as nanoscaffolds, which guide PFA solution to effectively spread over the substrate and form a continuous layer, minimizing the penetration of PFA into the pores of the substrate. After pyrolysis process, the CMS membranes with 100-1000 nm-thick active layer can be obtained by adjusting the CNT loading. The 322 nm-thick CMS membrane exhibits the best trade-off between the gas permeance and selectivity, a H
Start Date: 05-2022
End Date: 05-2025
Amount: $438,400.00
Funder: Australian Research Council
View Funded Activity