Anti-Fouling Behavior of Hyperbranched Polyglycerol-Grafted Poly(ether sulfone) Hollow Fiber Membranes for Osmotic Power Generation 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Environmental Science & Technology: ES&T
年/卷/期
2014 / 48 / 16
页码
9898-9907
ISSN号
0013-936X
作者单位
Department of Chemical & Biomolecular Engineering, National University of Singapore, Singapore 117585, Singapore;Department of Chemical & Biomolecular Engineering, National University of Singapore, Singapore 117585, Singapore;Department of Chemical & Biomolecular Engineering, National University of Singapore, Singapore 117585, Singapore;
作者
Xue Li;Tao Cai;Tai-Shung Chung;
摘要
To sustain high performance of osmotic power generation by pressure-retarded osmosis (PRO) processes, fouling on PRO membranes must be mitigated. This is especially true for the porous support of PRO membranes because its porous structure is very prone to fouling by feeding river water. For the first time, we have successfully designed antifouling PRO thin-film composite (TFC) membranes by synthesizing a dendritic hydrophilic polymer with well-controlled grafting sites, hyperbranched polyglycerol (HPG), and then grafting it on poly(ether sulfone) (PES) hollow fiber membrane supports. Compared to the pristine PES membranes, polydopamine modified membranes, and conventional poly(ethyIene glycol) (PEG)-grafted membranes, the HPG grafted membranes show much superior fouling resistance against bovine serum albumin (BSA) adsorption, E. coli adhesion, and S. aureus, attachment. In high-pressure PRO tests, the PES TFC membranes are badly fouled by model protein foulants, causing a water flux decline of 31%. In comparison, the PES TFC membrane grafted by HPG not only has an inherently higher water flux and a higher power density but also exhibits better flux recovery up to 94% after cleaning and hydraulic pressure impulsion. Clearly, by grafting the properly designed dendritic polymers to the membrane support, one may substantially sustain PRO hollow fiber membranes for power generation.
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