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Preparation and desalination performance of PVDF / PI cation exchange membrane

Authors： Qianjie Wang, Honghai Li1,Baowei Su

Units： 1. School of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China; 2. College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao, 266100, China

KeyWords： Cation exchange membrane; Surface modification; Electrodialysis; Immersion precipitation phase transformation; Crosslinking

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(1):1-9

Abstract：

Polyvinylidene fluoride (PVDF)/Polyimide (PI) blend membrane was prepared by the immersion precipitation phase transformation method. Then the PVDF/PI membrane was modified using 4,4'-diaminostilbene-2,2'-disulfonic acid and triethylamine (DASD-TEA) aqueous solution to prepare PVDF/PI cation exchange membrane. The effects of soaking time, temperature, concentration of DASD-TEA solution and PI concentration on the desalination rate of the PVDF/PI cation exchange membrane were explored. The optimal composition of the casting solution is 19.0 wt% PVDF, 1.0 wt% PI and 80.0 wt% N, N-dimethylformamide (DMF). The optimal conditions of the DASD-TEA modification are 0.03 wt% DASD in the DASD-TEA aqueous solution, and soaking at 50.0 ℃ for 10 min. The ion exchange capacity (IEC) of the PVDF/PI cation exchange membrane is 0.32 mmol·g-1, the water content is 38.6%, the pure water permeability is 50 L·m-2·h-1·bar-1, the contact angle is 81.9 °, and the transmembrane resistance is 2.96 Ω·cm2. The desalination experiment was carried out in the electrodialysis device with three membrane pairs under 4 V voltage for 120 min, with 2000 mg/L NaCl solution as feed at a flow rate of 40 L·h-1. The desalination rate of the PVDF/PI cation exchange membrane is 1.33 times that of the commercial cation exchange membrane.。

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AuthorIntro：

王乾杰（1994-），男，山东聊城人，硕士研究生，研究方向：传质与分离工程，E-mail: wqjqust@163.com。

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