铀在高岭土上的吸附动力学及热力学研究

doi:10.3969/j.issn.1000-1565.2016.06.006

河北大学学报(自然科学版) ›› 2016, Vol. 36 ›› Issue (6): 596-603.DOI: 10.3969/j.issn.1000-1565.2016.06.006

铀在高岭土上的吸附动力学及热力学研究

梁诗敏^1,2,于涛^1,2

收稿日期:2016-08-12 出版日期:2016-11-25 发布日期:2016-11-25
通讯作者: 于涛(1979—),男,吉林白城人,东华理工大学副教授,主要从事环境放射化学的研究.E-mail:xiaoshan770@163.com
作者简介:梁诗敏(1993—),女,湖北鄂州人,东华理工大学在读硕士研究生. E-mail:1530043655@qq.com
基金资助:
国家自然科学基金资助项目(21561001)

Kinetic and thermodynamic study of U(Ⅵ)adsorption onto kaolin

LIANG Shimin^1,2,YU Tao^1,2

1.State Key Laboratory Breeding Base of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China; 2.School of Nuclear Science and Engineering, East China University of Technology, Nanchang 330013, China

Received:2016-08-12 Online:2016-11-25 Published:2016-11-25

摘要/Abstract

摘要： 采用静态法研究了铀(U(Ⅵ))在高岭土上的吸附特性,探讨了pH、离子强度、接触时间、温度、腐殖酸等对U(Ⅵ)在高岭土上吸附的影响.以宏观吸附实验为基础,对高岭土进行X线衍射(XRD)和扫描电镜(SEM)表征,并讨论了铀(U(Ⅵ))在高岭土上的吸附动力学及热力学行为.结果说明,准二级动力学模型可以用来描述铀在高岭土上的吸附.通过对溶液pH值和离子强度因素的研究,溶液pH值对铀的吸附影响比离子强度对铀的吸附影响更大.在较低pH值下,腐殖酸对吸附有加强的作用;在较高pH值下,腐殖酸对吸附有抑制作用.Freundlich模型可较好地描述高岭土对U(Ⅵ)的吸附过程.高岭土对U(Ⅵ)的吸附为自发且吸热的过程,主要是表面单分子层吸附.

关键词: 高岭土, 铀, 吸附, 动力学, 热力学

Abstract: By static adsorption experiments,the effects of pH,ionic strength,adsorption time,solid-liquid ratio,temperature,humic acid on the adsorption of U(Ⅵ)onto kaolin were studied.Based on macroscopic adsorption experiments,the adsorption process was analyzed by thermodynamics and kinetics methods,and the kaolin samples were characterized by X-ray diffraction and scanning electron microscopy.The results show that pseudo-second-order kinetic model can be used to describe the adsorption of uranium on kaolin.Through the study of pH and ionic strength,the effect of pH on the adsorption of uranium is greater than the effect of the ionic strength on the adsorption of uranium.The presence of HA reduces the adsorption in a high pH range,while enhances the adsorption at low pH values.The adsorption of U(Ⅵ)onto kaolin could be described by Freundlich isothermal adsorption equation.The adsorption of U(Ⅵ)onto kaolin is an endothermic process,mainly occurs on the surface as a monomolecular layer.

Key words: kaolin, U(Ⅵ), adsorption, kinetics, thermodynamics

中图分类号:

梁诗敏,于涛. 铀在高岭土上的吸附动力学及热力学研究[J]. 河北大学学报(自然科学版), 2016, 36(6): 596-603.

LIANG Shimin,YU Tao. Kinetic and thermodynamic study of U(Ⅵ)adsorption onto kaolin[J]. Journal of Hebei University (Natural Science Edition), 2016, 36(6): 596-603.

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铀在高岭土上的吸附动力学及热力学研究

Kinetic and thermodynamic study of U(Ⅵ)adsorption onto kaolin

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