摘要
利用共沉淀水热法制备了镁铝阴离子粘土材料,研究了其水溶液对砷酸根离子的去除能力。结果表明:镁铝阴离子粘土对砷酸根离子具有较高的去除率和吸附容量、较快的吸附速度。砷酸根离子的吸附平衡数据很好的符合Freundlich型吸附等温方程。同时,吸附动力学数据完全符合Lagergren二级速度方程。吸附砷酸根离子后的阴离子粘土材料,用稀Na2CO3溶液可以很好的洗脱再生。阴离子粘土对砷酸根离子的吸附属于层间离子交换作用。
Mg- Al anionic clay was prepared by eopreeipitation and the hydrothermal method, and the removal of arsenate anions from the elay＇s aqueous solution was investigated. The results show that Mg - Al anionic clay has high removal efficiency, high capacity adsorption and a high rate of adsorption for arsenate anion. The adsorption equilibrium data for arsenate anions can be described by the Freundlich isothermal equation. At the same time, the dynamic adsorption data are well followed the Lagergren pseudo-second rate equation. The results of regeneration studies show that the diluted Na2CO3 solution is an efficient agent for regenerating anionic clay after As（V） loading. The mechanism for arsenate removal can be classified as ion exchange in the interlayer of anionic clay.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2005年第8期1023-1027,共5页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(40472026)资助项目。
