【摘要】 研究所用膨润土的主要成分为S iO2和A l2O3,属于Ca基膨润土,BET表面积为50.83 m2/g。在恒温及恒定pH条件下,用静态吸附法研究了膨润土对Pb2+、Cu2+、Cr3+的吸附特性,结果表明其较好地符合Lagergren二级吸附速率方程,对这3种离子的吸附速率为Pb2+>Cu2+>Cr3+。利用3种等温线方程对吸附过程进行拟合,发现利用Langmu ir吸附等温方程计算的值与膨润土吸附Pb2+、Cu2+、Cr3+试验数据最为吻合。膨润土对3种金属离子的平衡吸附量为Cr3+>Cu2+>Pb2+。更多还原

【Abstract】 Bentonite used in this study is mainly composed of SiO₂ and Al₂O₃ and belongs to Ca-smectites.The surface area is 50.83 m²/g.Adsorption tests of Pb（Ⅱ）,Cu（Ⅱ）,Cr（Ⅲ） in batch reactors were carried out at ambient temperature and constant pH.The adsorption kinetics fit well with Lagergren-second-order.The increasing order of the adsorption rates follows the sequence Pb（Ⅱ）> Cu（Ⅱ）> Cr（Ⅲ）.Three isotherm models were adopted to describe the adsorption.The date determined from the Langmuir model fits well with the experiment.The maximal adsorption capacities vary in the following order: Cr（Ⅲ）> Cu（Ⅱ）> Pb（Ⅱ）.更多还原