活性炭自水溶液中对钇(Ⅲ)离子及其配合物的吸附

Adsorption of Y(Ⅲ) Ion and Its Complexes on Active Carbon from Aqueous Solution

测定了吸附的速度曲线和等温线，研究了浓度、温度、溶液ｐＨ值、无机离子、配体和表面活性剂对吸附的影响．结果表明：吸附服从通用吸附等温式，吸附过程是焓驱动的放热、熵减的自发过程；吸附最佳ｐＨ值为４．８～５．５；ＯＸ－，ＳＣＮ－，Ｐ２Ｏ４－７，ＥＤＴＡ等配体与Ｙ（Ⅲ）的配合物的吸附符合Ｌｅｃｋｉｅ提出的吸附模型Ⅰ和Ⅲ；各类表面活性剂在活性炭的等电点前后，对吸附有转折性影响，阴离子表面活性剂ＳＤＳ有明显的增吸作用。

The rate curves and isotherms for the adsorption of Y(Ⅲ) ion and its hydroxo complexes from aqueous solutions on active carbon have been measured. The effects of concentration,temperature,solution pH values,ligands,surfactants on adsorption were studied.The results show: (1)The isotherm in common use is obeyed,and the calculations show △G<0,△H<<0(-41.4kJ/mol),△S<0 in the adsorption process; the optimum pH values of adsorption are 4.8 5.5;(2)The adsorption model of SCN -,P 2O 4- 7,OX complexes with Y 3+ fits Leckie's model Ⅰ,and EDTA Y(Ⅲ) complex fits Leckie's model Ⅲ;(3)The effcts of surfactants are in relation with solution pH,surfactant concentration and type of surfactant;anionic surfactant SDS increases the adsorption of Y(Ⅲ),cationic surfactant CTABr decreases the adsorption.