柱撑蒙脱石对水中砷(Ⅴ)的吸附研究

摘要

The modified montmorillonite has been prepared with polymeric Al/Fe. The effect and influential factors of the montmorillonite (used as absorbent), on the removal of arsenate As(Ⅴ) from the aqueous solution have been studied in batch experiments. The result shows that after pillaring modified, the adsorption capacity can be improved obviously. The relationship between adsorbing capacity and equilibrium mass concentration is in accordance with the rule described by the isothermal adsorption equations of Freundlich and Langmuir. The kinetic characteristics of the arsenate on pillared montmorillonite is also studied, that Elovich equation and Two-constant kinetic equation can describe the kinetic characteristics very well.%采用羟基聚合Al-Fe为柱化剂对蒙脱石进行改性,将制得的柱撑蒙脱石作为吸附剂,研究了其对水溶液中砷的去除效果及其影响因素.结果表明:对蒙脱石柱撑改性后能显著提高其吸附性能.平衡吸附量与平衡质量浓度之间的关系符合Freundlich和Langmuir等温吸附方程所描述的规律.用Elovich方程和双常数方程可以较好地拟合柱撑蒙脱石对As(Ⅴ)的动力学吸附过程.