膜科学与技术

聚吡咯-壳聚糖改性制备单价选择性阳离子交换膜试验

作者：李福勤，王绍州，郭彦夫

单位：河北工程大学能源与环境工程学院，河北省邯郸市 056038

关键词：聚吡咯-壳聚糖；静态电渗析；表面改性；交联；单价选择性

出版年,卷(期):页码： 2022,42(3):106-112

摘要：

以体积比为1:1的聚吡咯和壳聚糖混合液浸渍改性普通均相阳离子交换膜，再通过2.5%戊二醛交联制备具有单价选择性能的阳离子交换膜。通过静态电渗析试验考察氧化剂种类、氧化剂浓度、浸渍时长、交联时长等因素对改性膜分离性能的影响，确定了最佳改性条件：氧化剂为0.8mol/L的Na2S2O8，浸渍时间为6 h，交联时间为16 h。改性后膜表面更加平整，离子交换容量为0.93mmol/g，含水率、溶胀度分别为13.92%、9.95%，接触角为103.03°，化学稳定性显著提高。静态电渗析2h后H+的透过率为79.88%，Zn2+的泄漏率仅为1.59%，选择透过性系数达到50.24。

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.

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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