两价重金属阳离子透过阳离子交换膜选择透过性的研究

THE STUDY ON PERMSELECTIVITIES OF BIVALENT HEAVY CATION ACROSS CATION EXCHANGE MEMBRANE

本文研究了电渗析过程中两份重金属阳离子Cu^(2+),Co^(2+),Ni^(2+),Zn^(2+)等对基准离子Mg^(2+)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Cu^(2+),Co^(2+),Ni^(2+),Zn^(2+)等分别和Mg^(2+)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,Cu^(2+),Co^(2+),Ni^(2+),Zn^(2+)等对Mg^(2+)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Cu^(2+),Co^(2+),Ni^(2+),Zn^(2+)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Mg^(2+)相当。

The permselectivities of the bivalent heavy metal cation Cu^(2+), Co^(2+) , Ni^(2+), Zn^(2+) to mag-nesium ion Mg^(2+) 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.