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Adsorption and Competitive Adsorption of Copper and Other Metal Ion by Bentonite
Author(s): 
Pages: 26-29
Year: Issue:  12
Journal: Environmental Science and Management

Keyword:  膨润土重金属等温吸附竞争吸附;
Abstract: 膨润土对重金属铜的吸附随铜离子浓度的增加先快速增长而后趋于缓慢最后达成平衡,饱和吸附量为34.10 mg·g-1.Langmuir方程、Freundlich方程和Temkin方程均能拟合实验结果,但Temkin方程拟合为最佳.pH是影响膨润土对Cu2+吸附的主要因素.低pH值不利于膨润土对Cu2+的吸附.引入竞争离子,膨润土对Cu2+的吸附量明显降低.Pb2+、Cd2+、Ni2+对Cu2+的吸附产生不同程度的竞争作用,其竞争力为Pb2+>Cd2+>Ni2+.在竞争离子存在的情况下,Cu2+的吸附依然遵守等温吸附模型.饱和吸附量从34.10 mg·g-1下降到16.93 mg·g-1( Pb2+)、19.21 mg·g-1(Cd2+)、26.08 mg·g-1(Ni2+).
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