机构地区: 南京大学环境学院污染控制与资源化研究国家重点实验室
出 处: 《环境污染治理技术与设备》 2006年第10期55-58,共4页
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+。 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 ).
领 域: [环境科学与工程]