阴离子粘土吸附As(Ⅴ)的动力学研究

Adsorption kinetics of As(Ⅴ) from aqueous solutions by anionic clay

利用共沉淀水热法制备镁铝阴离子粘土材料,研究了其吸附水中As(Ⅴ)的动力学。结果表明,在初始浓度为20.42～60.88mg/L及温度为298～323K的范围内,阴离子粘土对水中As(Ⅴ)的吸附动力学数据均符合拟二级速率方程。吸附表观活化能为14.40kJ/mol,说明温度对此吸附的影响并不显著。

Mg-Al anionic clay was prepared employing coprecipitation and hydrothermal method, and the adsorption kinetics of As （ V ） from aqueous solutions by anionic clay was investigated. The results show that kinetics data for the adsorption of As （ V ） from aqueous solutions were in good agreement with pseudo-second rate equation within the initial concentration of 20.42-60.88 mg/L and experimental temperature of 298-323 K. The apparent adsorption activation energy is as low as 14.40 kJ/mol, suggesting that the experimental temperature has no marked influence on the adsorption of As （ V ） onto anionic clay.