SiO_2-PWA/PVA改性阳离子交换膜选择透过性研究  

Study on Selective Permeability of Cation Exchange Membrane Modified by Si O2-PWA/PVA

作　　者：张亚涛 周键 王三反 ZHANG Yatao;ZHOU Jian;WANG Sanfan(School of Environmental and Municipal Engineering,Lanzhan Jiaotong Universit;Engineering Research Center for Cold and Arid Regions Water Resource Comprehensive Utilization,Ministry of Education： Lanzhou 730070,Chin)

机构地区：[1]兰州交通大学环境与市政工程学院寒旱地区水资源综合利用教育部工程中心,甘肃兰州730070

出　　处：《水处理技术》2018年第8期31-34,40,共5页Technology of Water Treatment

基　　金：国家科技支撑计划项目(2015BAE04B01);国家自然科学基金项目(21466019);甘肃省省青年科技基金计划(17JR5RA088)

摘　　要：对阳离子选择透过性不高的离子交换膜,采用固定了荷电基团磷钨酸(PWA)的溶胶Si O_2-PWA/聚乙烯醇(PVA)对其进行改性,以电解时膜的Cl^-泄漏率为评价指标,研究改性条件对膜选择透过性的影响,并对膜的表面形貌和官能基团进行表征。结果表明,在原膜预处理时间为2 h,溶胶溶质质量比1:2:10,溶胶的质量浓度0.5 kg/L,热处理温度与时间60℃和2 h的情况下,膜改性效果最佳,相比于原膜,Cl^-泄漏率降低了8.5%,膜电阻降低了3.5Ω·cm^2,亲水角降低了45°。具有应用于需要高选择透过性离子交换膜相关的水处理领域潜力。For the cation selective permeability of some ion exchange membranes were not very high,sol Si O2-PWA/PVA was used to modify the membrane.The chloride ion leakage rate of membrane as the evaluation index in electrolysis process to study the effect of modification conditions on the selective permeability of membranes,and the surface topography and functional group of membrane were characterized.The results showed that,under the condition of the pretreatment time was 2 h,solute proportion of sol was 1：2：10,the mass concentration of sol was 1 kg/L,the heat treatment temperature and time was60℃and 2 h respectively,the modification effect was optimal.Compared to the original membrane,the chloride ion leakage rate,membrane resistance and hydrophilic angle modified membrane was reduced by 8.5%,3.5Ω·cm^2and 45 degrees respectively,it had the potential to be applied in water treatment fields.

关 键 词：SiO2-PWA/PVA 磷钨酸 聚乙烯醇 表面改性 阳离子交换膜 选择透过性 Cl^-泄漏率 

分 类 号：TQ050.425[化学工程]