重金属Pb(II)在膨润土上去除特性研究

Removal behaviors of heavy metal Pb(II) by use of bentonite

摘要: 深入研究成本低廉的膨润土对水溶液中Pb(II)的吸附特性，采用Batch试验方法，分析了土水比、pH、离子强度、反应时间、温度及Pb(II)的初始浓度对Pb(II)在膨润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。Pb(II)在膨润土上去除率与pH、离子强度有很强的依赖性。当pH<7时，膨润土对Pb(II)的吸附主要是离子交换，而当7

Abstract: The adsorption of lead on bentonite is studied by means of the Batch experiment due to its low cost and easy availability. The effects of soil-water content, solution pH, ionic strength, reaction time, temperature and initial Pb(II) concentration on the removal of Pb(II) by use of bentonite, kinetic process and adsorption equilibrium are investigated. The removal of Pb(II) from aqueous solutions by use of bentonite is strongly dependent on pH and ionic strength. When pH<7, the removal of Pb(II) is dominated by ion-exchange on soil surfaces, whereas inner-sphere surface complexation is the main adsorption mechanism when 7