阴离子有机改性膨润土吸附废水中甲基紫的热力学规律研究

采用十二烷基磺酸钠对膨润土进行改性，制得阴离子有机改性膨润土。通过静态吸附法探讨了改性膨润土对染料废水中甲基紫的吸附等温式和吸附热力学规律。结果表明，随着温度的升高，平衡吸附量增加；随着平衡浓度的增加，平衡吸附量不断增大，并趋于饱和。不同温度下吸附等温式与Langmuir方程拟合较好，热力学分析表明，吸附过程吸热，吸附焓变和熵变均为正值，吸附自由能变为负值。

Study on Adsorption of Anionic Organic Modified Bentonite for Methyl Violet

A type of anionic organic modified bentonite, SDS-Bt, was synthesized by modifying bentonite with sodium dodecyl sulfate. The adsorption performance such as adsorption isotherms and thermodynamics have been investigated through batch experiments of adsorbing methyl violet by modified bentonite. The equilibrium adsorption increased with increasing temperature and increasing balance concentration until being saturated. The adsorption isotherms of different temperatures followed the Langmuir equation. What＇s more, the adsorption process was endothermic. Both the enthalpy changes （△H） and the entropy changes （△S） were positive, while the free energy changes （△G） were negative.