Negatively charged hyperbranched polyglycerol grafted membranes for osmotic power generation from municipal wastewater 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Water research: A journal of the international water association
年/卷/期
2016 / 89 / Feb.1
页码
50-58
ISSN号
0043-1354
作者单位
Natl Univ Singapore, Dept Chem & Biomol Engn, Kent Ridge 117585, Singapore;Natl Univ Singapore, Dept Chem & Biomol Engn, Kent Ridge 117585, Singapore;Natl Univ Singapore, Dept Chem & Biomol Engn, Kent Ridge 117585, Singapore;Natl Univ Singapore, Dept Chem & Biomol Engn, Kent Ridge 117585, Singapore;
作者
Li, Xue;Cai, Tao;Chen, Chunyan;Chung, Tai-Shung;
摘要
Osmotic power holds great promise as a clean, sustainable and largely unexploited energy resource. Recent membrane development for pressure-retarded osmosis (PRO) is making the osmotic power generation more and more realistic. However, severe performance declines have been observed because the porous layer of PRO membranes is fouled by the feed stream. To overcome it, a negatively charged antifouling PRO hollow fiber membrane has been designed and studied in this work. An antifouling polymer, derived from hyperbranched polyglycerol and functionalized by a-lipoic acid and succinic anhydride, was synthesized and grafted onto the polydopamine (PDA) modified poly(ether sulfone) (PES) hollow fiber membranes. In comparison to unmodified membranes, the charged hyperbranched poly glycerol (CHPG) grafted membrane is much less affected by organic deposition, such as bovine serum albumin (BSA) adsorption, and highly resistant to microbial growths, demonstrated by Escherichia coli adhesion and Staphylococcus aureus attachment. CHPG-g-TFC was also examined in PRO tests using a concentrated wastewater as the feed. Comparing to the plain PES-TFC and non-charged HPG-g-TFC, the newly developed membrane exhibits not only the smallest decline in water flux but also the highest recovery rate. When using 0.81 M NaCl and wastewater as the feed pair in PRO tests at 15 bar, the average power density remains at 5.6 W/m(2) in comparison to an average value of 3.6 W/m(2) for unmodified membranes after four PRO runs. In summary, osmotic power generation may be sustained by properly designing and anchoring the functional polymers to PRO membranes. (C) 2015 Elsevier Ltd. All rights reserved.
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关键词/主题词
Poly(ether sulfone);Pressure-retarded osmosis;Thin-film composite membranes;Fouling;Municipal wastewater;Osmotic power;
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