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环境化学  2015 

稻草炭对溶液中Cu(Ⅱ)的吸附作用

Keywords: 稻草炭,,吸附/解吸,Zeta电位,表面官能团

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Abstract:

研究了稻草炭对Cu(Ⅱ)的吸附特征,探讨了Cu(Ⅱ)的吸附机制.结果表明,稻草炭对Cu(Ⅱ)有很高的吸附容量,Langmuir方程能很好地拟合Cu(Ⅱ)吸附等温线,因此可以描述稻草炭对Cu(Ⅱ)的吸附,其预测的Cu(Ⅱ)在pH4.5和pH5.0时的最大吸附量分别为0.628mol·kg-1和0.763mol·kg-1.稻草炭对Cu(Ⅱ)的吸附量随体系pH升高而增加,但吸附Cu(Ⅱ)的解吸率呈相反的变化趋势.当吸附体系pH≤4.5时,Cu(Ⅱ)解吸率大于55%,说明此时以静电吸附为主;在较高pH条件下Cu(Ⅱ)以非静电吸附机制为主.红外光谱的分析结果表明,稻草炭表面有丰富的—COOH和—OH等含氧官能团,Cu2+与含氧官能团形成有机络合物导致—COOH吸附峰位移.Cu(Ⅱ)吸附使稻草炭颗粒的Zeta电位向正值方向位移.结果说明Cu(Ⅱ)在稻草炭表面发生了专性吸附.

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