作　　者： ; ; ; ; ;

机构地区： 中国海洋大学环境科学与工程学院海洋环境与生态教育部重点实验室

出　　处： 《化工环保》 2008年第3期230-234,共5页

摘　　要： 研究了碱渣对溶液中Cd2+的吸附特征。实验结果表明,碱渣对Cd2+的吸附量随温度升高而降低,随Cd2+初始质量浓度增加而增大,随体系pH升高而增大。当体系pH<7.52时,表面吸附起主导作用,吸附作用力主要为偶极间力和氢键力,碱渣对Cd2+的吸附热力学可用Freundlich等温吸附方程较好地描述;而当吸附体系pH>8.00时,吸附作用力主要为化学键力,吸附过程可用Langmuir等温吸附方程较好地描述。当体系pH=7.00时,碱渣对Cd2+的吸附动力学用二级动力学方程拟合效果最佳;当体系pH为8.00和9.01时,用Langmuir动力学方程拟合的效果最佳。 The adsorption characteristics of Cd2＋on results show that the adsorption amount of Cd2＋ the surface of alkaline sludge were studied. The is decreasing with the increasing of system temperature, and increasing with the increasing of initial Cd2＋ concentration and system pH. When the system pH is under 7.52, the adsorption is mainly due to surface adsorption with dipole force and hydrogen bond force, the adsorption thermodynamics can be well described by Freundlich isothermal adsorption equation. When the system pH is over 8.00, the adsorption is mainly due to chemical bond force, the adsorption can be well described by Langmuir isothermal adsorption equation. When the system pH is 7.00, the adsorption kinetics can correspond best with second order kinetics equation, and when the system pH is 8.00 and 9.01, it can correspond best with Langmuir kinetics equation.

关 键 词： 碱渣 镉离子 吸附 吸附动力学 热力学

领　　域： [环境科学与工程]