锶在黑云母上的吸附及影响因素研究  

The sorption of strontium on biotite and some influencing factors

作　　者：胡娜 牛玉清[2] 常明凯 鲜东帆 周万强 周根茂[2] 杨小雨 刘春立[1] Na Hu;Yuqing Niu;Mingkai Chang;Dongfan Xian;Wanqiang Zhou;Genmao Zhou;Xiaoyu Yang;Chunli Liu(Beijing National Laboratory for Molecular Sciences,Fundamental Science Laboratory on Radiochemistry and Radiation Chemistry,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China;Beijing Institute of Chemical Engineering and Metallurgy,China National Nuclear Corporation,Beijing 101149,China)

机构地区：[1]北京大学化学与分子工程学院,北京分子科学国家研究中心,放射化学与辐射化学重点学科实验室,北京100871 [2]中国核工业集团公司,核工业北京化工冶金研究院,北京101149

出　　处：《中国科学：化学》2020年第4期498-506,共9页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金(编号:U1530112,11475008,U1730245)资助项目。

摘　　要：本文通过静态批式吸附实验研究了离子强度、pH、温度以及共存离子等对Sr2+在黑云母上吸附的影响.结果表明,当pH在3.0~5.0之间时, Sr2+在黑云母上的吸附可忽略;当pH在5.0~10.0之间时,随着pH的增加, Sr2+在黑云母上的吸附百分比迅速上升.随着离子强度的增大, Sr2+在黑云母上的吸附百分比逐渐降低. Sr2+在黑云母上的吸附动力学和吸附等温线分别符合准二级动力学模型和Freundlich等温吸附模型. X射线光电子能谱分析结果表明, Sr2+主要是与黑云母表面的铁羟基发生了配合作用.The effect of ionic strength, pH, temperature and co-existing ions on the sorption of Sr2+ on biotite was investigated by batch technique. The results showed that the sorption of Sr2+ on biotite was ignorable at pH range from3.0 to 5.0, and then increased sharply with the increase of pH from 5.0 to 10.0. Besides, the sorption percentage of Sr2+ on biotite significantly decreased with the increase of ionic strength. The sorption kinetics and isotherms of Sr2+ on biotite can be well fitted by pseudo-second-order kinetic model and Freundlich model, respectively. The results of XPS analysis indicated that Sr2+ was mainly complexed with the iron hydroxyl on the surface of the biotite.

关 键 词：锶 黑云母 吸附 环境放射化学 

分 类 号：X771[环境科学与工程—环境工程] O647.3[理学—物理化学]