新疆沸石对放射性核素锶和铯的吸附性能研究

Study on Adsorption Performance of Zeolite from Xinjiang Province for Radioactive Strontium and Caesium

采用静态吸附实验方法,研究了吸附时间、溶液p H值、吸附剂投加量和溶液初始浓度等因素对新疆沸石吸附Sr2+和Cs+的性能的影响。结果表明:新疆沸石对含Cs+放射性废水的处理效果要优于对含Sr2+的处理效果,其原因在于Cs+离子水合半径比Sr2+的离子水合离子小,当Sr2+和Cs+与沸石层间Na+、K+、Ca2+和Mg2+等发生离子交换时,Cs+离比Sr2+离子更易于进入蒙脱石层间而被固定。

The static adsorption experiments are carried out to investigate the adsorption performance of strontium and caesium on zeolite in different adsorption time, pH values, adsorbent dosage and initial concentration. These results indicates that the adsorption performance of zeolite for Cs^＋ is better than Sr^2＋ , and the reason is that hydrated ionic radius of caesium is bigger than hydrated ionic radius of strontium, so that Cs^＋ is more easily to be adsorbed into the interlayer of zeolite than Sr^2＋, when Sr^2＋ and Cs ^＋ are respectively exchanged with Na^＋ ,K^＋ ,Ca^2＋ and Mg^2 ＋ of zeolite.