铝锆柱撑蒙脱石处理Cr(Ⅵ)废水的应用研究

Study on the treatment of wastewater containing Cr(Ⅵ) by AlZr pillared montmorillonite

比较了膨润土原土及铝锆柱撑蒙脱石处理Cr(Ⅵ )废水的性能 ,探讨了蒙脱石用量、Cr(Ⅵ )废水浓度、pH值等因素对膨润土吸附Cr(Ⅵ )实验的影响 .结果表明 :铝锆柱撑蒙脱石对Cr(Ⅵ )的吸附效果比原土有较大提高 ;Cr(Ⅵ )废水的pH值、膨润土用量对Cr(Ⅵ )吸附效率影响较大 .当pH =2 ,柱撑膨润土用量为 6g·L- 1 ,对浓度为 5 0mg·L- 1 Cr(Ⅵ )吸附率几乎达 10 0 % .铝锆柱撑蒙脱石应用于化工厂的铬渣浸出液中Cr(Ⅵ )的吸附效果显著 .铝锆柱撑蒙脱石对Cr(Ⅵ )的吸附包括表面物理吸附与层间离子化学吸附 .

The abilities of original and AlZr pillared montmorillonites had been compared in treating wastewater containing Cr(Ⅵ).Some factors were examined in the experiment of adsorbing Cr(Ⅵ) such as the amounts of original and AlZr pillared montmorillonites, the concentration of Cr(Ⅵ), the pH values of wasterwater and so on.The results showed that the adsorption of Cr(Ⅵ) by AlZr pillared montmorillonites was better than that of the original montmorillonites. The pH values of wastewater and the amounts of AlZr pillared montmorillonite influenced the adsorptive effect greatly.The adsorptive percentage almostly reached 100% in treating 50mg·L -1 Cr(Ⅵ) wastewater at pH=2 by 6g·L -1 AlZr pillared montmorillonites. The AlZr pillared montmorillonites have been successfully applied to treat the lixivium of wasteresidue containing Cr(Ⅵ) from the chemical plant. The adsorption of Cr(Ⅵ) by AlZr pillared montmorillonites included the physical adsorption on the surface and the chemical adsorption in the layer.