混酸改性粉煤灰对砷的吸附研究  

Adsorption of Arsenate by the Fly Ash Modified by Mixed Acid

作　　者：赵文岩[1] 杨磊[1] 萨仁其其格[1] 马静静[1] 贾光男 

机构地区：[1]内蒙古大学化学化工学院,呼和浩特010021 [2]赤峰市喀喇沁旗环境保护局,内蒙古赤峰024400

出　　处：《内蒙古大学学报（自然科学版）》2009年第5期625-629,共5页Journal of Inner Mongolia University：Natural Science Edition

基　　金：内蒙古自然科学基金资助项目(200607010206);内蒙古大学科研启动基金项目(205217)

摘　　要：研究了混酸改性粉煤灰对水中砷的吸附．表明去除砷酸根离子的最佳pH值范围是5～7．吸附动力学数据完全符合Lagergren二级速度方程．在所研究的砷浓度范围内，使用Freundlich型吸附等温式能很好地描述吸附平衡数据，并计算出吸附热力学参数AG^0，△H^0，△S^0．在柱吸附实验中，运用Thomas模型预测了本实验的穿透曲线，计算出改性粉煤灰对砷的柱吸附量为14．8mg／g．Adsorption of arsenate by the fly Results of experiments showed that the removal of ash modified by mixed acid was investigated. arsenate by the fly ash reached its maximum in pH value range from 5 to 7. The sorption kinetic data could be described by the Lagergren pseudosecond order rate equation. Freundlich model can be used to simulate the adsorption equilibrium data of arsenate ions within the range of research, so the thermodynamic parameters such as changes in free energy （△G^0）,enthalpy （△H^0） ,entropy （△S^0） can also be worked out. In the column study, the Thomas model was applied to predict the breakthrough curves of arsenate, and the adsorbent capacity of the modified fly ash was worked out at 14.8 mg/L.

关 键 词：改性粉煤灰 砷 吸附 柱研究 

分 类 号：O647.3[理学—物理化学]