渗透
纳滤
聚砜
膜
相位反转
化学工程
材料科学
共聚物
高分子化学
化学
复合材料
聚合物
渗透
生物化学
工程类
作者
Tao Liu,Longlong Wang,Wenliang Wang,Jianhua Yang,Yunxia Hu
出处
期刊:Desalination
[Elsevier]
日期:2024-01-12
卷期号:575: 117314-117314
被引量:8
标识
DOI:10.1016/j.desal.2024.117314
摘要
The nanofiltration (NF) membranes having excellent chlorine resistance and sufficient perm-selectivity are highly desired in drinking water treatment and other applications. Herein, a novel block copolymer NF membrane with superior chlorine resistance, especially high water permeance was prepared via phase inversion, using a tailor-made polysulfone-block-hyperbranched polyglycerol (PSf-b-hPG) material. The fabricated PSf-b-hPG NF membrane shows an extremely thin separation layer with a thickness of around 80 nm and a high overall porosity of 65 %, thanks to the structural advantage of hyperbranched hydrophilic hPG segments and the unique feature of the PSf-b-hPG casting solution of possessing a very low viscosity at a high solid content. The membrane exhibits an effective pore diameter of 1.6 nm, and the molecular weight cut-off (MWCO) was around 4 kDa. The membrane displayed extremely high pure water permeance of 34 LMH/bar as well as a satisfactory Na2SO4 rejection of 74 %. Moreover, the membrane exhibits superior chlorine resistance with no change in separation performance when challenged with 36,000 ppm∙h chlorination intensity and also maintains a stable Na2SO4 rejection and water permeance during the 14 h NF test. Our results suggest the NF membrane prepared by PSf-b-hPG has superior chlorine resistance and high water permeance, and is capable of efficiently removing sulfate from drinking water or others.
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