蒙脱土吸附稀土离子综合化学实验  

Comprehensive chemical experiment of montmorillonite adsorbing rare earth ions

作　　者：周芳[1] 冯健[1] 吴柏宏 张臻悦[1] 吴晓燕[1] 池汝安 

机构地区：[1]武汉工程大学绿色化工过程教育部重点实验室,湖北武汉430073

出　　处：《实验技术与管理》2018年第1期60-65,共6页Experimental Technology and Management

基　　金：国家自然科学基金面上项目(41472071)

摘　　要：分别以La^(3+)和Y^(3+)为轻稀土元素和重稀土元素的代表,探讨了蒙脱土吸附稀土离子的吸附性能和吸附机理。采用密封振荡平衡法考察了初始浓度、温度和时间对蒙脱土吸附稀土离子的影响。确定蒙脱土吸附La^(3+)和Y^(3+)符合Freundlich吸附等温模型,属于非均匀表面的单层吸附,蒙脱土吸附La^(3+)和Y^(3+)动力学符合准二级动力学方程,蒙脱土吸附La^(3+)活化能为28.1kJ/mol、吸附重稀土钇离子的活化能为13.8kJ/mol。该综合化学实验将理论知识与实验紧密结合起来,锻炼了学生的实验动手能力,激发了学生的科研兴趣。With La^(3+)and Y^(3+)as the representatives of light and heavy rare earth elements respectively,the adsorption properties and adsorption mechanism of montmorillonite adsorbing rare earth ions are discussed.The effects of initial concentration,temperature and time on the montmorillonite adsorbing rare earth ions are investigated by means of a sealing oscillation balance method.It is determined that the montmorillonite adsorption of La^(3+)and Y^(3+)conforms to the Freundlich adsorption isotherm model,which belongs to the monolayer adsorption of inhomogeneous surface.The dynamics of montmorillonite adsorption of La^(3+)and Y^(3+)accords with the pseudo-second-order dynamic equation.The activation energy of montmorillonite adsorption of La^(3+)is 28.1 kJ/mol,and the activation energy of adsorption of heavy rare earth yttrium ion is 13.8 kJ/mol.This comprehensive chemical experiment closely combines theoretical knowledge with the experiment,and exercises the students' practical ability,and stimulates their interest in scientific research.

关 键 词：综合化学实验 蒙脱土 稀土离子 吸附 

分 类 号：O6-3[理学—化学] TB383[一般工业技术—材料科学与工程]