中文摘要：

采用Batch试验研究了黏土对水溶液中Pb（Ⅱ）的吸附特性，分析了土水比、反应时间、pH和温度对Pb（Ⅱ）在黏土上吸附性能的影响，并对吸附动力学和吸附平衡试验进行了探讨。试验结果表明，当土水比增加时，吸附量相应降低，去除率却相应提高。黏土对Pb（Ⅱ）的吸附速度较快，可在120min内达到吸附平衡。pH0较低时，黏土对Pb（Ⅱ）的主要吸附机理为离子交换；pH0较高时，黏土对Pb（Ⅱ）的主要吸附机理为表面络合反应。吸附动力学特性符合伪二级动力学模型，液膜扩散速率显著大于黏土颗粒内扩散速率。Langmuir模型可较好地模拟黏土对Pb（Ⅱ）等温吸附特性，吸附量可达18．86mg／g，低温有利于黏土对Pb（Ⅱ）的吸附。

英文摘要：

Adsorption of lead on clay is studied by batch experiments. The effect of soil-water content, reaction time, solution pH and temperature on the removal of Pb（Ⅱ） by clay, and the kinetic process and adsorption equilibrium are investigated. Adsorption capacity of clay decreases with the increase of soil-water content, while the Pb（Ⅱ） removal efficiency increases sharply. The adsorption of Pb（Ⅱ） on clay is a fast process and can reach equilibrium within 120 min. The removal of Pb（Ⅱ） from aqueous solutions onto clay is strongly dependent on the value of pH. At low value of pH0, the removal of Pb（Ⅱ） is dominated by ion-exchange on clay surfaces, whereas surface complexation is the main adsorption mechanism at high value of pH0. The kinetic data fit the pseudo-second order kinetics very well and the rate of film diffusion is obviously higher than that of the diffusion into clay particles. The adsorption isotherms are best-fit with the Langrnuir isotherm. The saturated adsorption capacity of Pb（Ⅱ）D on clay is 18.86 mg/g and low temperature favors the adsorption process.