文献类型：期刊文献

英文题名：Triethanolamine modification produces ultra-permeable nanofiltration membrane with enhanced removal efficiency of heavy metal ions

作者：Zhang, Xin[1,2];Jin, Pengrui[1];Xu, Daliang[1,3];Zheng, Junfeng[1];Zhan, Zi-Ming[2];Gao, Qieyuan[1];Yuan, Shushan[4];Xu, Zhen-Liang[2];van der Bruggen, Bart[1,5]

机构：[1]Katholieke Univ Leuven, Dept Chem Engn, Celestijnenlaan 200F, B-3001 Heverlee, Belgium;[2]East China Univ Sci & Technol, Membrane Science& Engn R&D Ctr, Chem Engn Res Ctr, Sch Chem Engn,State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]Harbin Inst Technol, Sch Environm, State Key Lab Urban Water Resource & Environm, Harbin 1550090, Peoples R China;[4]Huazhong Univ Sci & Technol, Sch Environm Sci & Engn, Wuhan 430074, Peoples R China;[5]Tshwane Univ Technol, Fac Engn & Built Environm, Private Bag X680, ZA-0001 Pretoria, South Africa

年份：2022

卷号：644

外文期刊名：JOURNAL OF MEMBRANE SCIENCE

收录：;EI(收录号：20215011319707);WOS:【SCI-EXPANDED(收录号:WOS:000788496200003)】；

基金：Acknowledgment Xin Zhang would like to acknowledge the support provided by China Scholarship Council (CSC) of the Ministry of Education, P.R.China (CSC No. 202006740062) and the National Natural Science Foundation of China (22078092 and 21978082) .

语种：英文

外文关键词：Divalent heavy metal ions; Kevlar support; Triethanolamine; Nanofiltration; Grafting modification

摘要：Nanofiltration membranes are attractive for the removal of the heavy metal ions but limited by the trade-off between permeance and solute rejection. Membrane permeance is closely correlated to hydrophilicity and so-lute rejection is closely linked to size exclusion and Donnan electrostatic repulsion. Here, triethanolamine was employed as a crosslinking agent to prepare modified polyethyleneimine/trimesoyl chloride nanofiltration (PEI/ TMC NF) membranes with excellent separation performance for the removal of heavy metal ions from contaminated water. The permeance was more than 2 times increased from 6.4 Lm(-2)h(-1)bar(-1) to 13.6 Lm(-2)h(-1)bar(-1) due to the increase in membrane hydrophilicity resulting from the incorporation of hydrophilic hydroxyl groups on the membrane surface; the rejection of metals was high (around 97% rejection for Zn2+, Cd2+, Ni2+, Cu2+; around 92% rejection for Pb2+) due to the enhancement of positive charges on the membrane surface resulting from lone pair electrons of N elements on triethanolamine and the decrease in pore size of the membrane (MWCO from 280 Da to 220 Da). The short-term filtration test (72 h) of the simulated wastewater with various metal ions shows that the prepared membranes have excellent stability for industrial application. Unlike the traditional superior permeance achieved by ultrathin membranes with weakness and defects, the triethanolamine modification endows the pristine PEI-TMC NF membranes with superior performance without the complicated methods for thickness reduction.