Improving the separation performance of the forward osmosis membrane based on the etched microstructure of the supporting layer

被引：49

作者：

Zhao, Xinzhen ^{[1
]}

Li, Jing ^{[2
]}

Liu, Changkun ^{[1
]}

机构：

[1] Shenzhen Univ, Coll Chem & Environm Engn, Shenzhen Key Lab Environm Chem & Ecol Remediat, Shenzhen 518060, Peoples R China

[2] Chongqing Univ, Sch Chem & Chem Engn, Chongqing 400044, Peoples R China

来源：

DESALINATION | 2017年 / 408卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Forward osmosis; Supporting layer; Concentration polarization; Etched microstructure; THIN-FILM COMPOSITE; INTERNAL CONCENTRATION POLARIZATION; FO MEMBRANE; DESALINATION; SUBSTRATE; TFC; NANOCOMPOSITE; REDUCTION; PRESSURE; POLYMER;

D O I：

10.1016/j.desal.2017.01.021

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The physical and chemical characteristics of the porous supporting layer play a key role in the separation efficiency and concentration polarization of the forward osmosis (FO) membranes. In this paper, the modified polyvinylidene fluoride (PVDF) porous membranes with high porosity and large amounts of surface membrane pores were prepared with zinc oxide (ZnO) nanoparticles as the template, and used as the supporting layer of the FO membrane. The modified FO membranes showed enhanced water permeability and separation selectivity. The increased water flux was based on the increase of the effective membrane area, and the decreased tau/epsilon (tortuosity factor/porosity) value obviously alleviated the concentration polarization phenomenon based on the optimization of the flow channel. The etching of the porous microstructure could reduce the limit of the supporting layer on the separation performance of the FO membrane, and provide a simple method to improve the separation efficiency of the thin film composite (TFC)-type FO membranes. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：102 / 109

页数：8

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