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Preparation and desalting performance of positively charged composite nanofiltration membrane with N, N'- bis (3-aminopropyl) methylamine as a monomer

Authors： Ye qian1，Li junjun2，Han zilong1，Chen tao2，Gao congjie1，Pan qiaoming2

Units： 1，Second Institute of Oceanography of the State Oceanic Administration, Zhejiang, Hangzhou 310012；2，Hangzhou water treatment technology research and development center, Zhejiang, Hangzhou 310012

KeyWords： nanofiltration; positively charged membrane; N,N’-bis(3-aminopropyl)methylamine; trimesoyl chloride; Diethylenetriamine

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2016,36(5):53-59

Abstract：

A positively charged composite nanofiltration membrane was prepared via interfacial polymerization with N, N'- bis (3-aminopropyl) methylamine as an aqueous phase monomer and trimesoyl chloride as an oil phase monomer. To adjust and finally optimize rejection rate of magnesium sulfate of the nanofiltration membrane, diethylenetriamine was added into the aqueous phase.The rejection rates of different inorganic salt by the composite nanofiltration membrane were MgCl2> MgSO4> NaCl> Na2SO4, and the retention rate of MgCl2 could be maintained at about 98%. The rejection rate of MgSO4 rose from 75% to 98% by adjusting the dosage of diethylenetriamine. The rejection rates of monovalent cation salt such as Na2SO4 and NaCl were small. The structures of some representative nanofiltration membranes were characterized by scanning electron microscopy, attenuated total reflection infrared spectroscopy and X-ray photoelectron spectroscopy. Zeta potential was used to characterize the surface charge, meanwhile, hydrophilic property of membrane surface was measured by using a contact angle measuring instrument.

Funds：

浙江省海水淡化技术研究重点实验室项目（2012E10001 ）；杭州市创新链产业链重大创新项目（ 20132111A01）；工信部新材料产业化专项项目

AuthorIntro：

第一作者简介（1991-），男，籍贯，主要从事膜材料研究，邮箱：zjyeqian@163.com，电话：18968405295。通讯作者信息：电子邮箱：panqm@chinawatertech.com。

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