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粉煤灰粘土膨润土等对Cd~(2+)吸附性能的比较研究

Keywords: 粉煤灰,Cd2+,吸附,等温线

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Abstract:

采用室内试验方法,研究了粉煤灰、粘土、膨润土等从溶液中去除有毒金属离子Cd2+的吸附过程。结果表明,粉煤灰、膨润土对Cd2+的吸附能力远大于粘土、粉质粘土,且粉煤灰大于膨润土。平衡吸附模型充分说明在高浓度下,Cd2+在粘土、粉质粘土上的吸附最符合Langmuir等温线。试验结果还表明,随着吸附剂中Cd2+浓度的增加,粉煤灰等吸附剂对Cd2+吸附的百分率均呈减小的趋势。

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