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磁性海泡石吸附Cr(VI)特性及动力学

Keywords: 海泡石,磁性,Cr(VI),动力学

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Abstract:

采用化学共沉淀法合成磁性海泡石,通过静态吸附实验研究磁性海泡石对Cr(VI)的吸附特性及其动力学。结果表明,磁性海泡石对Cr(VI)的吸附在90min内即可达到平衡;体系的初始pH是影响磁性海泡石吸附Cr(VI)性能的重要因素;当废水中Cr(VI)的初始浓度为50mg/L时,磁性海泡石的适宜投加量为10g/L;随反应温度的升高,磁性海泡石对Cr(VI)的吸附量增加;温度为25、35和45℃时,磁性海泡石对Cr(VI)的饱和吸附量分别为3.32、3.72、4.08mg/g;吸附动力学曲线可以用拟二级反应动力学模型拟合;内扩散和液膜扩散联合控制Cr(VI)在磁性海泡石上的吸附过程,其中内扩散的控速作用大于液膜扩散。

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