Anti-fouling membranes by manipulating surface wettability and their anti-fouling mechanism

Lu, Xuemei and Peng, Yuelian and Qiu, Haoran and Liu, Xinrui and Ge, Lei (2017) Anti-fouling membranes by manipulating surface wettability and their anti-fouling mechanism. Desalination, 413. pp. 127-135. ISSN 0011-9164

Abstract

This study aims to compare the anti-wetting and anti-fouling surface behavior in membrane distillation (MD) by two surface modification routes on porous polyvinylidene fluoride (PVDF) membranes. A superhydrophobic membrane (SiO2-PFTS/PVDF) was obtained by dynamically forming 1H,1H,2H,2H-perfluorooctyl trichlorosilane containing SiO2 nanoparticles on the membrane surface as in our previous study; whereas a superhydrophilic membrane (PVA/PVDF) was developed by attaching a thin layer of poly(vinylalcohol) hydrogel onto the membrane's surface. The effects of surface modification on their anti-wetting or anti-fouling properties were examined in MD using an aqueous NaCl solution with various organic foulants (e.g., kerosene, humic acid (HA), and sodium dodecyl benzene sulfonate (SDBS)). The results showed that the superhydrophobic SiO2-PFTS/PVDF membrane displayed excellent self-cleaning characteristics and wetting resistance against all three studied foulants. In contrast, the hydrophilic surface layer of the PVA/PVDF membrane only slowed down wetting and fouling when in contact with kerosene and HA. Nonetheless, when dealing with SDBS, its anti-wettability performance was comparable to that of the SiO2-PFTS/PVDF membrane. The superhydrophobic SiO2-PFTS/PVDF membrane exhibited anti-fouling and anti-wetting behaviors even though the extended Derjaguin–Landau–Verwey–Overbeek theory indicated the attraction force between the membrane surface and all three foulants.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - No Department
Date Deposited: 25 May 2017 03:24
Last Modified: 17 Apr 2018 23:48
Uncontrolled Keywords: anti-wetting; anti-fouling; superhydrophobic; superhydrophilic; membrane distillation
Fields of Research : 09 Engineering > 0904 Chemical Engineering > 090404 Membrane and Separation Technologies
Socio-Economic Objective: D Environment > 96 Environment > 9611 Physical and Chemical Conditions of Water > 961199 Physical and Chemical Conditions of Water not elsewhere classified
Identification Number or DOI: 10.1016/j.desal.2017.02.022
URI: http://eprints.usq.edu.au/id/eprint/31118

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