研究了甲基对硫磷和西维因在蒙脱石、高岭石和针铁矿表面的吸附-解吸特征. 结果表明,Langmuir方程能较好的描述甲基对硫磷和西维因在3种矿物表面的等温吸附过程,且蒙脱石对农药的最大吸附量大于高岭石和针铁矿. 用动力学方程对2种农药的吸附过程进行拟合,Elovich方程、双常数方程和一级动力学方程均得到较好的结果,其中Elovich方程为最佳模型,相关系数(R~2)在0.93～0.98之间,说明该吸附为非均相扩散过程. 3种矿物对甲基对硫磷和西维因的吸附强度均为蒙脱石＞高岭石＞针铁矿.
Adsorption/desorption characteristics of methyl parathion and carbaryl on the surfaces of montmorillonite, kaolinite and goethite were investigated. The results show that the isotherm adsorption of methyl parathion or carbaryl on clay minerals fitted Langmuir equation very well. Montmorillonite had a greater adsorption capacity for the two pesticides than goethite and kaolinite. Kinetics of methyl parathion or carbaryl adsorption could be described by first-order equation, Elovich equation and two-constant equation. Elovich equation was the optimum model for its adsorption kinetics, the coefficients(R~2) of which ranged between 0.93 and 0.98, indicating that the adsorption was a non-homogeneous diffusion process. The binding strength of methyl parathion and carbaryl on the minerals followed the sequence of montmorillonite＞kaolinite＞goethite.
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