Adsorption of Cadmium and Lead in Two Typical Soils as Affected by Temperature

WANG Jin-gui; LV Jia-long; CAO Ying-fei

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Adsorption of Cadmium and Lead in Two Typical Soils as Affected by Temperature

更新时间：2024-11-07

- Adsorption of Cadmium and Lead in Two Typical Soils as Affected by Temperature
- Vol. 25, Issue 6, (2011)
- 作者机构：
  
  西北农林科技大学资源环境学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2011
- 稿件说明：
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WANG Jin-gui, LV Jia-long, CAO Ying-fei. Adsorption of Cadmium and Lead in Two Typical Soils as Affected by Temperature[J]. 2011, 25(6).
DOI：

WANG Jin-gui, LV Jia-long, CAO Ying-fei. Adsorption of Cadmium and Lead in Two Typical Soils as Affected by Temperature[J]. 2011, 25(6). DOI：

摘要

采用批平衡法研究我国2种典型土壤对镉和铅的吸附特性及其与温度的关系

运用热力学参数ΔG°、ΔH°和ΔS°解释土壤镉和铅的吸附机理

并对镉和铅在复合共存情况下的吸附特性进行讨论。结果表明

镉和铅在土壤中的吸附过程表现出明显的非线性

镉和铅的吸附分别符合Freundlich模型和Lang-muir模型。塿土对镉和铅的最大吸附量和最大缓冲容量均大于红壤的。镉和铅复合共存时

2种重金属的吸附均受到抑制;温度升高时

镉和铅对彼此的抑制作用有所减弱。吉布斯自由能变ΔG°为负值表明镉和铅吸附反应为自发反应;ΔH°为正值表明土壤对镉和铅的吸附为吸热反应。单一存在时

镉在塿土和红壤中的主要作用力分别为氢键和范德华力;而铅在塿土和红壤中的主要作用力均为范德华力。复合共存时

镉和铅的主要作用力发生改变。

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