Layer-by-layer assembly of polyethyleneimine/graphene oxide membranes for desalination of high-salinity water via pervaporation

被引:91
作者
Halakoo, Elnaz [1 ]
Feng, Xianshe [1 ]
机构
[1] Univ Waterloo, Dept Chem Engn, Waterloo, ON N2L 3G1, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Layer-by-layer assembly; Graphene oxide; Polyethyleneimine; High-salinity water; HOLLOW-FIBER MEMBRANES; GRAPHENE OXIDE; COMPOSITE MEMBRANES; REVERSE-OSMOSIS; NANOFILTRATION MEMBRANE; POLYAMIDE MEMBRANES; CROSS-LINKING; PERFORMANCE; DEHYDRATION; SEPARATION;
D O I
10.1016/j.seppur.2019.116077
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
This study reports on surface modification of thin-film-composite (TFC) polyamide membranes for desalination of high-salinity water via pervaporation. The membrane modification involves surface treatment of the polyamide membrane with chlorine, followed by layer-by-layer (LbL) deposition of positively charged poly-ethyleneimine (PEI) and negatively charged graphene oxide (GO). It was shown that the controlled membrane chlorination significantly increased water permeability and incorporating PEI and GO to the chlorine-treated polyamide membrane improved the salt rejection. The pure water flux through the PEI/GO LbL membrane was two times higher than that through the original membrane. The PEI/GO LbL membrane was tested for desalination of aqueous solutions containing NaCl, Na2SO4, MgSO4 andMgCl(2) salts, and a water flux as high as 8 kg/m(2) h with a high salt rejection ( > 99.9%) was obtained for all the tested salts at various temperatures and feed concentrations.
引用
收藏
页数:12
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