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High throughput composite nanofiltration membranes were prepared based on BTP/PIP-TMC interfacial polymerization system

Authors： WANG Xinle, LIU Minghui, YU Haijun, ZHANG Zhao, WANG Cong, KANG Guodong, CAO Yiming, FU Xiaoyan

Units： 1. CNOOC EnerTech Beijing Research Institute of Engineering & Technology for Safety & Environment, Tianjin 300457; 2. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023; 3. Dalian Ecological Environment Monitoring Center, Dalian 116023

KeyWords： nanofiltration membrane; interfacial polymerization; 1, 3-bis [tri (hydroxymethyl) methylamino] propane; structural control

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2022,42(2):40-46

Abstract：

1, 3-bis [tri (hydroxymethyl) methylamino] propane (BTP) with good hydrophilic and linear structure characteristics and piperazine (PIP) were selected to form aqueous monomer, and the composite nanofiltration membrane was synthesized with homophentriacyl chloride (TMC) through interfacial polymerization. The membrane was characterized by ATR/FTIR, SEM and contact angle analyzer, and the effects of BTP content in aqueous monomer on the permeance and hydrophilicity of nanofiltration membranes were investigated. The results showed that BTP was successfully introduced into the polyamide separation layer. With the increase of BTP content in aqueous monomer, the thickness and water flux of the polyamide separation layer increased, but the salt rejection slightly decreased. The optimal water phase composition is: PIP concentration was 0.4wt %, BTP concentration was 0.6wt %, at this time, the pure water permeability coefficient of nanofiltration membrane was 10.5 Lm-2 h-1 bar-1, 1.54 times of the original membrane. The rejection rates of Na2SO4, MgSO4, MgCl2 and NaCl were 97.3%, 91.4%, 40.7% and 31.7%, respectively.

Funds：

海油发展科技项目“高性能膜法油水分离技术”（HFKJ-CGXM-AQ-2020-01）；大连市科技创新基金应用基础研究项目“新型碟管式反渗透膜组件研发”（2019J12SN67）；辽宁省自然科学基金“新型油水分离膜的制备与应用基础研究”（2019-MS-313）；

AuthorIntro：

王新乐（1989-），男，山东聊城人，工程师，硕士，主要从事工业废水膜处理技术研究

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