摘要
基于国内尚没有市售的良好双极膜,本研究以氯甲基化聚砜和磺化聚苯醚作为双极膜的阴阳膜层,在双极膜中间界面层固定络合金属作为催化剂,分别利用SnSO4、CrCl3、NiSO4作为催化剂制得3种双极膜,并与不添加任何催化剂制得的双极膜进行了比较.实验表明,络合金属对双极膜水解离有很好的催化作用,当中间界面层含有络合金属催化剂时,双极膜的水解离电势大大降低,并得到3种络合金属的催化活性为:Cr3+>Ni2+>Sn2+;过多催化剂用量会使双极膜的膜电阻增加;络合金属催化剂对双极膜的选择透过度影响不大,可以忽略;双极膜中间界面层中的络合金属催化剂与阴阳膜面的附着力不强,在酸碱环境中有些出现脱落或溶解.
Aimed at the preparation and property improvement of bipolar membranes used in water splitting electrodialysis technology, ehloromethylation polysulfone and sulfonation polyphenylene oxide were taken as the anion exchange membrane layer and the cation exchange membrane layer, then the metal complex was fixed between them as catalyst to prepare three kinds of bipolar membranes : BPMSn0.1, BPMCr0.1 and BPMNi0.1. They were compared with the bipolar membrane without any catalyst fixed. Experimental res@ uhs show that metal complex is effective catalyst for hydrolytic dissociation, and the electric potential is decreased greatly. The catalytic activity of three catalysts is as follows : Cr^3 + 〉 Ni^2 + 〉 Sn^2 +. The excessive amount of catalyst will increase the membrane resistance. The metal complex has little effect on selecting permeation; the adhesive force of catalyst with anion and cation layers is weak, and the falling off or dissolving of catalyst occurs in the electrodialysis process.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2009年第3期311-314,共4页
Materials Science and Technology
基金
国家高技术研究发展计划资助项目(2008AA06Z341)
关键词
络合金属
催化剂
双极膜
中间界面层
metal complex
catalyst
bipolar membrane
intermediate layer