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	Middle support layer formation and structure in relation to performance of three-tier thin film composite forward osmosis membrane
	Tian, Enling1; Wang, Xingzu1; Zhao, Yuntao1; Ren, Yiwei1,2; Tian, Enling3; Wang, Xingzu3; Zhao, Yuntao3; Ren, Yiwei3,4
	2017-11-01
摘要	In recent years, nanofibers have been directly used as the support layer for developing high-flux forward osmosis (FO) membrane due to their high porosity and low tortuosity. However, the rougher surface and larger pore size weaken the adhesion to the polyamide (PA) active layer. Conventional FO membrane made of phase inversion support layer exhibits favorable mechanical stability, however the water flux is poor due to severe internal concentration polarization (ICP). In order to simultaneously reduce the ICP and enhance the mechanical stability of FO membrane, a thin film composite (TFC) FO membrane composed of three layers was prepared, namely bottom electrospun hydrophobic/hydrophilic interpenetrating network composite nanofibers (HH-IPN-CNF) support layer, a phase separation formed microporous polyvinylidene fluoride (PVDF) middle support layer, and the top PA active layer formed by interfacial polymerization. The factors including polymer concentration, coagulation bath composition and the gate height of the casting blade that affect the mid-layer structure formation were investigated, respectively. With the mid-layer of FO membrane cast under different conditions, water flux ranged from 1039 to 30.62 LMH, by using 0.5 M NaCl draw solution and deionized water feed solution. The TFC FO membrane with high structure integrity may be promising candidate for engineered osmosis. (C) 2017 Elsevier B.V. All rights reserved.
关键词	Forward osmosis Thin film composite membrane Middle support layer structure Double support layers Membrane performance
DOI	10.1016/j.desal.2017.02.014
发表期刊	DESALINATION
ISSN	0011-9164
卷号	421页码:190-201
通讯作者	Ren, YW (reprint author), Chinese Acad Sci, Ctr Membrane Technol & Applicat Engn, Chongqing Inst Green & Intelligent Technol, Key Lab Reservoir Aquat Environm, 266 Fangzheng Ave,Shuitu Hitech Ind Pk, Chongqing 400714, Peoples R China.
收录类别	SCI
WOS记录号	WOS:000412608700020
语种	英语