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Preparation of univalent selective cation exchange membrane by modification of polypyrrole-chitosan

Authors： LI Fuqin,WANGShaozhou,GUOYanfu

Units： College of Energy and Environmental Engineering,Hebei University of Engineering,Handan 056038,China

KeyWords： polypyrrole-chitosan; static electrodialysis; surface modification; crosslinking; monovalent selectivity

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2022,42(3):106-112

Abstract：

The common homogeneous cation exchange membrane was impregnated with a mixture of polypyrrole and chitosan at a volume ratio of 1:1, and then crosslinked with 2.5% glutaraldehyde to prepare the cation exchange membrane with monovalent selectivity. The effects of oxidizer type, oxidizer concentration, impregnation time and crosslinking time on the separation performance of the modified membrane were investigated by static electrodialysis test. The optimal modification conditions were determined as follows: oxidizer was 0.8mol/L Na2S2O8, impregnation time was 6 h, crosslinking time was 16 h. After modification, the surface of the membrane is smoother, the ion exchange capacity is 0.93mmol/g, the water content and swelling degree are 13.92% and 9.95%, respectively, and the contact Angle is 103.03°. The chemical stability of the membrane is significantly improved. After 2 hours of static electrodialysis, the transmittance of H+ was 79.88%, the leakage rate of Zn2+ was only 1.59%, and the selective transmittance coefficient reached 50.24.

Funds：

河北省自然科学基金资助项目（E2021402015），河北省重点研发计划项目（19213602D）

AuthorIntro：

李福勤（1966-），男，山西临县人，博士，教授，研究方向为膜分离理论与技术

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