钛柱撑蒙脱石对罗丹明B的吸附性能

Study on Rhodamine B Adsorption onto Titanium Pillared Montmorillonite

采用酸性溶胶法制备了钛柱撑蒙脱石,研究了不同温度、pH值条件下样品对罗丹明B的吸附性能。结果表明,钛柱撑可以提高蒙脱石对水溶液中罗丹明B染料的吸附能力,吸附过程动力学符合准二级近似,为不可逆化学吸附,平衡吸附数据基本符合Langmuir和Freundlich吸附等温式;随着温度升高和pH值增大,钛柱撑蒙脱石对罗丹明B的吸附量下降,在温度298 K左右,pH值低于3时吸附效果较好。

The adsorption of rhodamine B onto titanium pillared montmorillonite prepared by sol-acid method has been studied at different temperature and pH. The results indicate that the titanium pillaring can enhance the adsorption performance of rhodamine B in solution by montmorillonite. The adsorption kinetics, which followed pseudo-second order approximate model, is irreversible. The equilibrium adsorption data can better fit with both Langmuir and Freundlich adsorption isothermal equation. The adsorption capacity of rhodamine B onto titanium pillared montmorillonite decreases with the increasing of temperature and pH. The adsorption effect is better at temperature about 298 K and below pH 3.