黄土中粘土矿物的提取及其对氯吡硫磷的吸附行为研究

On Loess Clay Mineral's Extraction and Its Adsorption of Chlorpyrifos

以黄土为原料并从中提取粘土矿物,研究粘土矿物对氯吡硫磷的吸附行为,并从吸附等温线,动力学和热力学角度对其吸附机理进行探讨.吸附等温线模型研究表明,粘土矿物对氯吡硫磷的吸附属于Langmuir和Freundlich的复合型吸附;吸附动力学模型研究表明,该过程符合拟二级动力学方程;吸附热力学参数研究表明,该过程是一个自发的吸热反应,且主要作用为氢键吸附.研究结果有助于进一步探究土壤中残留农药的自净机理.

We have extracted the clay mineral from loess and studied the adsorption of chlor- pyrifos by clay mineral and the adsorption mechanism in terms of isotherm, kinetics and ther- modynamics. The adsorptive isotherm model shows that clay mineral＇s adsorption of chlorpyrifos is in conformity with the isothermal adsorption equations of Langmuir and Freundlich. The ad- sorption kinetics studies indicate that the process of adsorption fits in with the pseudo-second order equation. The thermodynamics parameters manifest that the process is a spontaneous and endothermic reaction and the main mechanism is hydrogen-bonding. The research results will be helpful for further exploring the self-purification mechanism of pesticide residues in the soil.