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胺化改性米糠对水中Cr(Ⅵ)的吸附

Keywords: 胺化米糠,Cr(VI),吸附性能

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Abstract:

以环氧氯丙烷活化米糠,与乙二胺反应引入氨基制备了胺化米糠吸附剂。系统研究胺化米糠对Cr(VI)的吸附特性。结果表明,胺化米糠对Cr(VI)有很强的吸附作用,3.5h能达到吸附平衡,吸附动力学符合准一级吸附方程。吸附容量随Cr(VI)浓度增加而增大,胺化米糠与Cr(VI)离子发生单层吸附,对Cr(VI)最大吸附容量为36.1mg/g。溶液的pH和吸附温度对吸附特性有较大影响,最佳吸附pH为3,同时,升温有利于吸附的进行。热力学参数ΔH为正值和ΔG为负值表明胺化米糠吸附Cr(VI)是吸热的自发吸附。

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