Dual-layered nanocomposite membrane incorporating graphene oxide and halloysite nanotube for high osmotic power density and fouling resistance 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Journal of Membrane Science
年/卷/期
2018 / 564 /
页码
382-393
ISSN号
0376-7388
作者单位
UTS, Sch Civil & Environm Engn, CTWW, Sydney, NSW, Australia;UTS, Sch Civil & Environm Engn, CTWW, Sydney, NSW, Australia;UTS, Sch Civil & Environm Engn, CTWW, Sydney, NSW, Australia;Commonwealth Sci & Ind Res Org CSIRO Mfg, Sydney, NSW, Australia;Commonwealth Sci & Ind Res Org CSIRO Mfg, Sydney, NSW, Australia;UTS, Sch Civil & Environm Engn, CTWW, Sydney, NSW, Australia;Commonwealth Sci & Ind Res Org CSIRO Mfg, Sydney, NSW, Australia;
作者
Lim, Sungil;Park, Myoung Jun;Phuntsho, Sherub;Mai-Prochnow, Anne;Murphy, Anthony B.;Shon, Hokyong;Seo, Donghan;
摘要
This study introduces a thin-film composite (TFC) membrane with a dual-layered nanocomposite substrate synthesized using a dual-blade casting approach for application in osmotic power generation by the pressure-retarded osmosis (PRO) process. The approach incorporates halloysite nanotubes (HNTs) into the bottom polymer substrate layer and graphene oxide (GO) on the top layer substrate, on which a thin polyamide active layer is formed. The fabricated membrane substrate showed highly desirable membrane substrate properties such as a high porosity, opened-bottom surface, suitable top-skin surface morphology for subsequent active layer formation and high mechanical strength, which are essential for high-performance PRO processes. At a GO loading of 0.25 wt% and HNT loading of 4 wt%, the power density (PD) of the nanocomposite membrane was 16.7 W/m(2) and the specific reverse solute flux (SRSF) was 2.4 g/L operated at 21 bar applied pressure using 1 M NaCl as draw solution and deionized water as feed, which is significantly higher than the those for a single-layered or commercial PRO membrane. This membrane performance was observed to be stable in the pressure cycle test and under long-term operation. The membrane substrate with HNTs incorporated exhibited high fouling resistance to sodium alginate and colloidal silica foulants, with the PD decreasing by 17% after 3 h of operation, compared to a membrane substrate without HNTs and commercial PRO membranes, which decreased by 26% and 57%, respectively. A fluorescence microscope study of the membranes subjected to feed water containing Escherichia coli confirmed the good antibacterial properties of the dual-layered TFC membrane. The study provides an attractive alternative approach for developing PRO membranes with high PD and fouling resistance.
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关键词/主题词
Dual-blade casting;Nanocomposite membrane;Graphene oxide;Halloysite nanotube;Pressure-retarded osmosis;
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