| 液/固体系中硅藻土对Pb2+和Cd2+的吸附机制 |
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| 引用本文： | 朱健,王平,雷明婧,张烨,张伟丽.液/固体系中硅藻土对Pb2+和Cd2+的吸附机制[J].环境工程学报,2012,6(11):4123-4128. |
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| 作者姓名： | 朱健 王平 雷明婧 张烨 张伟丽 |
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| 作者单位： | 中南林业科技大学环境科学与工程研究中心,长沙,410004 |
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| 基金项目： | 湖南省自然科学省市联合基金资助项目(12JJ8016);环保公益性行业科研专项(200909066);湖南省环境科学重点学科建设基金资助项目(2006180) |
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| 摘 要： | 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Pb2＋、Cd2＋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Pb2＋、Cd2＋吸附量不断上升;硅藻土对Pb2＋、Cd2＋的等温吸附都符合Langmuir模型,硅藻土对Pb2＋、Cd2＋最大吸附量分别为10.428 mg/g和7.916 mg/g,硅藻土对Pb2＋具有更好的吸附能力;Pb2＋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Pb2＋、Cd2＋的吸附动力学属性,硅藻土对Cd2＋有较快的吸附速率。
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| 关 键 词： | 硅藻土 Pb2+ Cd2+ 吸附影响因素 吸附等温线 吸附动力学 |
Adsorption mechanism of Pb2+ and Cd2+ on diatomite in liquid/solid systems |
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| Zhu Jian,Wang Ping,Lei Mingjing,Zhang Ye and Zhang Weili.Adsorption mechanism of Pb2+ and Cd2+ on diatomite in liquid/solid systems[J].Techniques and Equipment for Environmental Pollution Control,2012,6(11):4123-4128. |
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| Authors: | Zhu Jian Wang Ping Lei Mingjing Zhang Ye and Zhang Weili |
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| Institution: | Institute of Environmental Science and Engineering Research, Central South University of Forestry & Technology, Changsha 410004,China;Institute of Environmental Science and Engineering Research, Central South University of Forestry & Technology, Changsha 410004,China;Institute of Environmental Science and Engineering Research, Central South University of Forestry & Technology, Changsha 410004,China;Institute of Environmental Science and Engineering Research, Central South University of Forestry & Technology, Changsha 410004,China;Institute of Environmental Science and Engineering Research, Central South University of Forestry & Technology, Changsha 410004,China |
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| Abstract: | 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 quantities of Pb2+ and Cd2+ were 10.428 mg/g and 7.916 mg/g, respectively. The adsorption property of Pb2+ on diatomite was better. Hydration energy of Pb2+ was lower, so Pb2+ can take off water film smoothly, and get into diatomite channels to react with active groups easily. Two-constant equation can indicate adsorption kinetics of Pb2+ and Cd2+ on diatomite well, adsorption rate of Cd2+ on diatomite is higher. |
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| Keywords: | diatomite Pb2+ Cd2+ adsorption influencing factors adsorption isotherm adsorption kinetic |
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