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黑碳吸附汞砷铅镉离子的研究

Keywords: 黑碳,,,,,吸附

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Abstract:

由玉米秸秆燃烧物提取黑碳,测定了黑碳阳离子交换量,研究了黑碳对汞(Hg2+)、砷(As3+)、铅(Pb2+)和镉(Cd2+)离子的等温吸附、吸附及解吸动力学特征。结果表明,黑碳阳离子交换量为0.15cmol·kg-1,远低于矿物和腐植酸。黑碳对Hg2+、As3+、Pb2+和Cd2+的等温吸附是非线性表面吸附,可用Langmiur方程拟合;黑碳对Pb2+最大吸附量远大于对Hg2+、As3+和Cd2+的;黑碳对Hg2+、As3+、Pb2+和Cd2+吸附约5h达平衡;吸附动力学过程包括吸附快反应阶段和慢反应阶段,可用动力学一级方程和双常数速率方程描述;黑碳对Hg2+、As3+、Pb2+和Cd2+吸附速率、吸附亲和力和最大吸附量有:Pb2+>As3+>Hg2+>Cd2+;黑碳吸附的Hg2+、As3+、Pb2+和Cd2+易解吸,30min内洗脱率高达85%以上。

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