J4 ›› 2012, Vol. 50 ›› Issue (4): 815-821.

• 化学 • 上一篇    下一篇

改性硅藻土对重金属离子的吸附规律

杨婷, 王洪良, 吕春欣, 熊鹰, 何冲, 康春莉   

  1. 吉林大学 环境与资源学院, 长春 130012
  • 出版日期:2012-07-01 发布日期:2012-09-07
  • 通讯作者: 康春莉 E-mail:kangchunli2002@163.comKANG

Adsorption Law of Heavy Metals on Modified Diatomite

YANG Ting, WANG Hong-liang, Lv Chunxin, XIONG Ying, HE Chong, KANG Chunli   

  1. College of Environment and Resources, Jilin University, Changchun 130012, China
  • Online:2012-07-01 Published:2012-09-07
  • Contact: Chunli E-mail:kangchunli2002@163.comKANG

摘要:

 利用CaCO3对硅藻土矿物进行改性. 研究结果表明: 单组分体系中CaCO3改性的硅藻土对Cu2+,Pb2+,Cd2+和Zn2+的吸附动力学规律均符合伪二阶动力学模型, 吸附热力学规律符合Langmuir模型; 在混合组分体系中, Pb2+,Cd2+和Zn2+的吸附速率降低, Cu2+的吸附速率增加, 对金属离子的吸附动力学规律仍然符合伪二阶动力学模型, 但对金属离子的吸附量均明显降低, 仅Pb2+的吸附热力学规律符合Langmuir模型.

关键词:  硅藻土, 改性, 重金属, 吸附

Abstract:

 Rich low-grade diatomite mineral was modified with calcium carbonate so as to improve the adsorption properties of diatomite for heavy metal ions. The results show that in a single component system, the dynamic laws for the adsorption of Cu2+,Pb2+ ,Cd2+and Zn2+ on the diatomite modified by calcium carbonate obey the pseudo-second-order model and the adsorption thermodynamics laws obey the Langmuir model. In a mixed component system, because of the effect of coexisting components, the adsorption rate of Pb2+,Cd2+ and Zn2+ was decreased respectively and the adsorption rate of Cu2+ was increased, but the adsorption dynamic laws of four kinds of metal ions still obey the pseudo-second-order model; at the same time, the adsorption capacities of four kinds of metal ions on the modified diatomite were decreased obviously and only the adsorption thermodynamics law of Pb2+ obeys the Langmuir model.

Key words: diatomite, modified, heavy metals, adsorption

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