期刊论文

中文

环境工程学报

1673-9108

2012

6

11

4123-4128

12JJ8016:湖南省自然科学省市联合基金 200909066:环保公益性行业科研专项 2006180:湖南省环境科学重点学科建设基金资助项目

本校为第一机构

为了提高硅藻土在重金属废水处理上的应用水平,采用静态吸附实验考察了液/固体系中硅藻土对Pb~(2+)、Cd~(2+)的吸附影响因素、吸附等温线和吸附动力学属性。结果表明,随着投加量的减少,离子初始浓度的提高,pH值的增大,吸附作用时间的延长,硅藻土对Pb~(2+)、Cd~(2+)吸附量不断上升;硅藻土对Pb~(2+)、Cd~(2+)的等温吸附都符合Langmuir模型,硅藻土对Pb~(2+)、Cd~(2+)最大吸附量分别为10.428 mg/g和7.916 mg/g,硅藻土对Pb~(2+)具有更好的吸附能力;Pb~(2+)具有较低的水合自由能,更容易脱去水膜与硅藻土孔道内的活性基团发生吸附作用;双常数扩散方程可以很好地描述硅藻土对Pb~(2+)、Cd~(2+)的吸附动力...

In order to promote application levels of diatomite in treatment of wastewater containing heavy metals,adsorption influencing factors,isotherms,kinetics of Pb2＋ and Cd2＋ on diatomite were studied by static adsorption experiment in liquid/solid systems.The results showed that adsorption quantity of Pb2＋ and Cd2＋ on diatomite will enlarge as decrease of diatomite dose and increase of ion initial concentration,pH,adsorption time.Adsorption isotherms of Pb2＋ and Cd2＋ on diatomite were both consistent with Langmuir model.The maximum adsorption...