改性伊利石对水中放射性U(VI)的吸附性能研究  

Study on Adsorption Properties of Modified Illite Materials for U(VI)in Water

作　　者：朱益萍 王学刚[1,2] 聂世勇 徐苏北 郭亚丹[1,2] 李鹏[1,2] ZHU Yiping;WANG Xuegang;NIE Shiyong;XUE Subei;GUO Yadan;LI Peng(School of Water Resource and Environmeriled Engineering,East China University of Technology;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology:Nanchang 330013,China)

机构地区：[1]东华理工大学水资源与环境工程学院 [2]东华理工大学省部共建核资源与环境国家重点实验室,江西南昌330013

出　　处：《水处理技术》2020年第5期30-35,共6页Technology of Water Treatment

基　　金：国家自然科学基金项目(51564001,51764001);省部共建核资源与环境国家重点实验室自主基金项目(Z1602);东华理工大学研究生创新项目(DHYC-201915)。

摘　　要：采用γ-氨丙基三乙氧基硅烷(KH550)对黏土矿物伊利石(Illite)进行改性,制备了吸附材料KH550@Illite。运用扫描电子显微镜、X射线衍射仪、傅里叶变换红外光谱仪等手段对其进行了表征,并考察了对模拟废水中U(VI)的吸附性能。结果表明:KH550已成功嫁接在伊利石表面,KH550对伊利石的改性为表面修饰作用。在溶液pH为5.0、初始U(VI)的质量浓度为5 mg/L、KH550@Illite投加量为8 g/L的优化条件下,反应60 min后达到吸附平衡,反应结束后U(VI)去除率达到99.25%,废水残余U(VI)的质量浓度为0.023 mg/L,能达到GB 23727-2009中规定的废水铀含量排放标准(≤0.05 mg/L)。吸附U(VI)符合准2级动力学方程,吸附过程为化学吸附,Langmuir吸附等温模型能更好地拟合KH550改性伊利石对水中U(VI)的吸附,主要以单分子层吸附。Illite was modified by γ-aminopropyl triethoxysilane(KH550),and the adsorption material KH550@Illite was prepared.KH550@Illite was characterized by SEM,XRD,FT-IR and other methods,and the adsorption properties for U(VI)in simulated wastewater was investigated.The results showed that KH550 has been successfully grafted on the surface of Illite,and it was surface modification.Under optimized conditions with solution pH was 5.0,the initial mass concentration of U(VI)was 5 mg/L,the dosage of KH550@Illite was 8 g/L.After 10 min adsorption reaction,the adsorption equilibrium was reached,the removal rate of U(VI)was 99.25%and the residual mass concentration of U(VI)in wastewater was 0.023 mg/L which was up to the discharge standard of uranium in wastewater specified in GB 23727-2009(≤0.05 mg/L).The pseudo-second order model was more successful to fit the uranium adsorption kinetics,the adsorption process is chemical adsorption.The adsorption of U(VI)by KH550@Illite in water was fitted well by the Langmuir model,which mainly in monolayer adsorption.

关 键 词：伊利石 Γ-氨丙基三乙氧基硅烷 吸附 U(VI) 放射性元素 

分 类 号：X771[环境科学与工程—环境工程]