摘要
采用静态实验方法研究了蒙脱石对水溶液中Ce（Ⅲ）的吸附特性,考察了pH值、吸附时间、固液比等参数对吸附的影响;通过研究蒙脱石吸附Ce（Ⅲ）的动力学和热力学行为,探讨蒙脱石对Ce（Ⅲ）的吸附机制。结果表明：蒙脱石吸附Ce（Ⅲ）受pH值的影响较大,随pH值的增加,吸附量增大;吸附动力学能很好地用准二级动力学方程（R^2=0.9997）拟合,吸附主要是化学吸附过程;以Langmuir拟合,获得其饱和吸附容量为73.53 mg/g,Freundlich模型能够对吸附等温线很好地拟合;以分配系数与温度的线性关系推出热力学参数（ΔH^Θ〉0、ΔS^Θ〉0和ΔG^Θ〈0）,数据表明蒙脱石对Ce（Ⅲ）吸附是一个自发的吸热过程。
The adsorption properties of Ce（Ⅲ） onto montmorillonite in aqueous solution was studied by static experiment. The adsorption effect of solution p H value, adsorption time, solid-liquid ratio was investigated, and the adsorption mechanism of Ce（Ⅲ） on montmorillonite was explored by studying the adsorption kinetics and thermodynamics behavior of montmorillonite for Ce（Ⅲ）. The results showed that the adsorption of Ce（Ⅲ） on montmorillonite is strongly influenced by p H value, and adsorption capacity increased with the increasing of pH value. The adsorption kinetics accords with pseudo-second dynamics equations（R^2=0.9997）, the adsorption is a chemical adsorption process. According to the Langmuir model, the maximum adsorption capacity is 73.53 mg/g, and the adsorption isotherm fitted Freundlich model very well. The thermodynamics parameters was calculated through the relationship between distribution coefficient and temperature, which showed that the adsorption of Ce（Ⅲ） onto montmorillonite is a spontaneous and endothermic process.
出处
《非金属矿》
CAS
CSCD
北大核心
2016年第2期31-34,共4页
Non-Metallic Mines
基金
国家自然科学基金(41372052)
四川省创新团队项目(14TD0012)
西南科技大学大学生创新基金(15yc049)
关键词
蒙脱石
吸附
Ce(Ⅲ)
动力学
热力学
montmorillonite
adsorption
cerium（Ⅲ）
dynamics
thermodynamics
