两价重金属阳离子透过阳离子交换膜选择透过性的研究
来源期刊：中南大学学报(自然科学版)1993年第1期
论文作者：薛德明 罗爱平 马建红
文章页码：52 - 57
关键词：选择透过性; 电渗析; 淌度; 脱盐; 浓缩
Key words：permselectivity; electrodialysis; mobility; desalt; concentrate
摘 要：本文研究了电渗析过程中两份重金属阳离子Cu2+,Co2+,Ni2+,Zn2+等对基准离子Mg2+透过国产聚乙烯异相阳膜的选择透过系数,它们在膜内的淌度比以及它们在膜内的选择吸附系数;试验研究了Cu2+,Co2+,Ni2+,Zn2+等分别和Mg2+组成的混合溶液体系中二价重金属离子的电渗析脱盐和浓缩特性。结果表明,Cu2+,Co2+,Ni2+,Zn2+等对Mg2+透过阳膜的选择透过性系数、在膜内的淌度比均稍大于1,而在膜内的选择吸附系数均稍小于1,亦即Cu2+,Co2+,Ni2+,Zn2+等离子在电渗析过程中透过阳膜的选择透过性、淌度和在膜内的选择吸附系数均与Mg2+相当。
Abstract: The permselectivities of the bivalent heavy metal cation Cu2+, Co2+ , Ni2+, Zn2+ to mag-nesium ion Mg2+ across the home-made ELM cation exchange membrane were studied duringthe electrodialysis process. Also the mobility ratio and selective absorption coefficiency in themembrane were measured. And the desalting and concentrating characteristics of these biva-lent heavy metal ions were investigated. The results show that the permselectivities and the mobility ratio in the membrane forbivalent heavy metal ions to magnesium is larger than 1, and the distribution coefficient inthe membrane is less than 1. It was recognized that the wastewater containing bivalent metalions could be more easily treated by ion exchange membrane electrodialysis.
