环境工程学报2011，Vol.5Issue(10)：2252-2256,5.
氢氧化镁对水中As（Ⅲ）的吸附作用
Adsorption of As（Ⅲ） ions from aqueous solution by magnesium hydroxide
摘要
Abstract
With magnesium hydroxide as the absorbent,the effects of magnesium hydroxide dose,pH,temperature,time on the adsorption were investigated.The adsorption equilibrium,kinetics and thermodynamics of As（Ⅲ） ions onto magnesium hydroxide were studied,the reaction mechanism was discussed.The results showed that while the initial arsenic concentration is 0.5～100 mg/L,temperature is 25 ℃,pH is 3,magnesium hydroxide dosage is 0.5～4 g,adsorption time is 1 h,the adsorption rate reaches more than 99%.Under the same conditions,the adsorption equilibrium time is 80 min.The adsorption isotherm accords with Freundlich mode.The double-constant rate equation and the parabolic diffusion kinetic equation can express the dynamics characteristics well.The adsorption free energy △Go is a negative value,which indicates that the process of adsorption As（Ⅲ） onto magnesium hydroxide is spontaneous.关键词
氢氧化镁/As（Ⅲ）/吸附/热力学/动力学Key words
magnesium hydroxid/As（Ⅲ）/adsorption/thermodynamics/kinetics分类
资源环境引用本文复制引用
陈思光,王劲松,杨金辉,包正垒,彭瑞婷,周志武..氢氧化镁对水中As（Ⅲ）的吸附作用[J].环境工程学报,2011,5(10):2252-2256,5.基金项目
湖南省科技厅计划项目 （）
湖南省安全生产监督局项目 （）
