A novel acid resistant thin-film composite nanofiltration membrane with polyurea enhanced dually charged separation layer

IF 4.9 Q1 ENGINEERING, CHEMICAL
Yang Cao , Yinhua Wan , Chulong Chen , Jianquan Luo
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引用次数: 11

Abstract

Fabricating acid resistant nanofiltration (NF) membranes with precise solute separation performance is highly demanded for acidic wastewater treatment but remains a challenge. Herein, we propose a facile strategy for preparing dually charged acid resistant NF membranes with both high cations and anions rejections via a two-layer reverse interfacial polymerization (r-IP) process. Organic monomers of trimesoyl chloride (TMC) and 1,4-phenylene diisocyanate (PPDI) are firstly applied to react with 3-aminobenzenesulfonamide (ABSA) to construct a negatively charged loose intermediate layer, followed by the r-IP of TMC/PPDI and polyethyleneimine (PEI) to engineer a dense positively charged top layer. The highly cross-linked polyurea (PU) formed by isocyanate and amine leads to an enhanced size sieving effect, and the well-arranged dually charged layer endows the membrane stronger electrostatic exclusion. The resultant membrane has 97.7% rejection of Na2SO4 and 93.0% of MgCl2, and it exhibits fairly high rejections to various heavy metals, as well as impressive long-term stability after exposure to strong acid (10 wt% of H2SO4 for 400 h).

一种新型聚脲增强双荷电分离膜耐酸复合纳滤膜
制备具有精确溶质分离性能的耐酸纳滤膜是酸性废水处理的迫切要求,但仍是一个挑战。在此,我们提出了一种简单的策略,通过两层反向界面聚合(r-IP)工艺制备具有高阳离子和阴离子排斥的双电荷耐酸NF膜。首先用有机单体三甲基氯(TMC)和1,4-苯基二异氰酸酯(PPDI)与3-氨基苯磺酰胺(ABSA)反应形成带负电的松散中间层,然后用TMC/PPDI和聚乙烯亚胺(PEI)的r-IP反应形成带正电的致密顶层。异氰酸酯与胺形成的高交联聚脲(PU)增强了浆料的筛分效果,排列良好的双荷电层使膜具有更强的静电阻隔性。所得膜对Na2SO4的截留率为97.7%,对MgCl2的截留率为93.0%,对各种重金属的截留率相当高,并且在强酸(10 wt% H2SO4)下暴露400小时后具有令人印象深刻的长期稳定性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
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