文献类型：期刊文献

英文题名：Alkali assisted poly(allylamine hydrochloride) surface-grafted nanofiltration membrane for enhancing removal properties of heavy metal ions

作者：Wang, Jiao[1,2];Han, Rui[1];Xu, Zhen-Liang[1,3];Jin, Xiao-Gang[1];Ma, Xiao-Hua[1]

机构：[1]East China Univ Sci Technol, Natl Engn & Technol Res Ctr Comprehens Utilizat Sa, Membrane Science& Engn R&D Lab, Chem Engn Res Ctr,Sch Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Natl Sch Elite Engineers, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Shanghai Elect Chem Innovat Inst, Shanghai 200237, Peoples R China

年份：2026

卷号：403

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20262220822426);WOS:【SCI-EXPANDED(收录号:WOS:001789186800001)】；

基金：The authors gratefully acknowledge for the financial support received from National Key Research and Development Program of China (2021YFB3801103 and 2021YFB3801101) and National Natural Science Foundation of China (22078092, 22208101, and 22078088) , as well as the research funding provided by the Fundamental Research Funds for the Central Universities (JKA01241502) .

语种：英文

外文关键词：Poly(allylamine hydrochloride); Surface grafting; Heavy metal removal; NaOH; Nanofiltration membrane

摘要：The treatment of industrial wastewater containing heavy metal ions remains a significant environmental challenge, with conventional methods often suffering from limitations such as low efficiency and secondary pollution. Nanofiltration (NF) membranes offer a promising alternative, but their performance is frequently constrained by inherent limitations like low permeability and insufficient selectivity, particularly for cations due to the typical negative surface charge of polyamide membranes. To address this, this study developed a novel NF membrane through surface grafting modification. A pristine polyamide (PA) selective layer was first fabricated via interfacial polymerization (IP) of piperazine (PIP) and trimesoyl chloride (TMC). Subsequently, poly(allylamine hydrochloride) (PAH) was grafted onto the membrane surface via a reaction with residual acyl chloride groups, with the assistance of NaOH to promote covalent bonding. The optimized PAH-1 membrane (0.5 w/v% PAH, 1.0 w/v% NaOH, 10 min grafting) achieved a high permeability of 10.3 L m(-2) h(-1) bar(-1) and a rejection of 97.8% for MgCl2. More importantly, the membrane demonstrated superior and stable removal efficiency (>95%) for divalent heavy metal ions (Mn2+, Co2+, and Ni2+). Furthermore, the PAH-1 membrane showed improved acid resistance compared to control samples, maintaining robust performance after immersion in a pH = 1 solution for 7 days, indicating its potential for treating acidic wastewater, such as those involved in lithium recovery. This work provides a feasible and effective strategy for fabricating high-performance NF membranes tailored for efficient heavy metal ion removal.