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http://dx.doi.org/10.12989/mwt.2012.3.1.035

A novel method of surface modification to polysulfone ultrafiltration membrane by preadsorption of citric acid or sodium bisulfite  

Wei, Xinyu (Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University)
Wang, Zhi (Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University)
Wang, Jixiao (Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University)
Wang, Shichang (Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University)
Publication Information
Membrane and Water Treatment / v.3, no.1, 2012 , pp. 35-49 More about this Journal
Abstract
In membrane processes, various agents are used to enhance, protect, and recover membrane performance. Applying these agents in membrane modification could potentially be considered as a simple method to improve membrane performance without additional process. Citric acid (CI) and sodium bisulfite (SB) are two chemicals that are widely used in membrane feed water pretreatment and cleaning processes. In this work, preadsorptions of CI and SB were developed as simple methods for polysulfone ultrafiltration membrane modification. It was found that hydrogen bonding and Van Der Waals attraction could be responsible for the adsorptions of CI and SB onto membranes, respectively. After modification with CI or SB, the membrane surfaces became more hydrophilic. Membrane permeability improved when modified by SB while decreased a little when modified by CI. The modified membranes had an increase in PEG and BSA rejections and better antifouling properties with higher flux recovery ratios during filtration of a complex pharmaceutical wastewater. Moreover, membrane chlorine tolerance was elevated after modification with either agent, as shown by the mechanical property measurements.
Keywords
ultrafiltration; modification; citric acid; sodium bisulfite; membrane property;
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