Omniphobic membrane via bioinspired silicification for the treatment of RO concentrate by membrane distillation

Meng, L; Mansouri, J; Li, X; Liang, J; Huang, M; Lv, Y; Wang, Z; Chen, V

Omniphobic membrane via bioinspired silicification for the treatment of RO concentrate by membrane distillation

Meng, L Mansouri, J Li, X Liang, J Huang, M Lv, Y Wang, Z Chen, V

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Journal of Membrane Science, 2022, 647, pp. 120267
Issue Date:: 2022-04-05

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Field	Value	Language
dc.contributor.author	Meng, L
dc.contributor.author	Mansouri, J
dc.contributor.author	Li, X
dc.contributor.author	Liang, J
dc.contributor.author	Huang, M
dc.contributor.author	Lv, Y
dc.contributor.author	Wang, Z
dc.contributor.author	Chen, V https://orcid.org/0000-0002-6604-6197
dc.date.accessioned	2023-07-03T04:51:13Z
dc.date.available	2023-07-03T04:51:13Z
dc.date.issued	2022-04-05
dc.identifier.citation	Journal of Membrane Science, 2022, 647, pp. 120267
dc.identifier.issn	0376-7388
dc.identifier.issn	1873-3123
dc.identifier.uri	http://hdl.handle.net/10453/171140
dc.description.abstract	Membrane distillation (MD) is promising for the reclamation of reverse osmosis (RO) concentrate ascribed to the advantages of moderate membrane fouling, space-saving and theoretical 100% rejection to non-volatile substances. However, wetting issues remain great challenges for the hydrophobic porous membrane in the treatment of industrial wastewater by MD. In this study, a novel omniphobic membrane is developed via bioinspired silicification and fluorosilanization. The effects of polydopamine/polyethylenimine (PDA/PEI) co-deposition and silicification time on the morphology, pore structure, wettability and separation performance of the membrane are systematically investigated. The results show that the membrane surface is evenly covered by a rough silica layer after bioinspired silicification. The omniphobic membrane exhibits excellent anti-wetting properties with high liquid entry pressure (326.4 kPa) and contact angles to liquids with various surface tensions such as water (162.50°), diiodomethane (149.20°), mineral oil (135.97°), etc. The omniphobic modification has little effect on the pore structure but increases the mechanical strength of membranes significantly. The MD operation results reveal that the virgin membrane is rapidly wetted by a feed solution of 0.1 mM sodium dodecyl sulfate (SDS) in 35 g/L NaCl, while the omniphobic membranes maintain stable MD performance over a 420 min operation against the feed with a SDS concentration of up to 0.3 mM. The omniphobic membrane shows a superior separation performance in the treatment of RO concentrates from dyeing and printing industry without wetting and fouling observed. Meanwhile, high rejections to salts, SDS, metals, water quality indexes (COD, TOC, TN, NH3–N) and organic matters are achieved, demonstrating a high efficiency of the omniphobic membrane for the reclamation of RO concentrates.
dc.language	en
dc.publisher	Elsevier
dc.relation.ispartof	Journal of Membrane Science
dc.relation.isbasedon	10.1016/j.memsci.2022.120267
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	03 Chemical Sciences, 09 Engineering
dc.subject.classification	Chemical Engineering
dc.title	Omniphobic membrane via bioinspired silicification for the treatment of RO concentrate by membrane distillation
dc.type	Journal Article
utslib.citation.volume	647
utslib.for	03 Chemical Sciences
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Provost
utslib.copyright.status	closed_access	*
dc.date.updated	2023-07-03T04:51:04Z
pubs.publication-status	Published
pubs.volume	647

Abstract:

Membrane distillation (MD) is promising for the reclamation of reverse osmosis (RO) concentrate ascribed to the advantages of moderate membrane fouling, space-saving and theoretical 100% rejection to non-volatile substances. However, wetting issues remain great challenges for the hydrophobic porous membrane in the treatment of industrial wastewater by MD. In this study, a novel omniphobic membrane is developed via bioinspired silicification and fluorosilanization. The effects of polydopamine/polyethylenimine (PDA/PEI) co-deposition and silicification time on the morphology, pore structure, wettability and separation performance of the membrane are systematically investigated. The results show that the membrane surface is evenly covered by a rough silica layer after bioinspired silicification. The omniphobic membrane exhibits excellent anti-wetting properties with high liquid entry pressure (326.4 kPa) and contact angles to liquids with various surface tensions such as water (162.50°), diiodomethane (149.20°), mineral oil (135.97°), etc. The omniphobic modification has little effect on the pore structure but increases the mechanical strength of membranes significantly. The MD operation results reveal that the virgin membrane is rapidly wetted by a feed solution of 0.1 mM sodium dodecyl sulfate (SDS) in 35 g/L NaCl, while the omniphobic membranes maintain stable MD performance over a 420 min operation against the feed with a SDS concentration of up to 0.3 mM. The omniphobic membrane shows a superior separation performance in the treatment of RO concentrates from dyeing and printing industry without wetting and fouling observed. Meanwhile, high rejections to salts, SDS, metals, water quality indexes (COD, TOC, TN, NH3–N) and organic matters are achieved, demonstrating a high efficiency of the omniphobic membrane for the reclamation of RO concentrates.

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