粉煤灰、粘土、膨润土等对Zn 2+的吸附试验研究 - 岩土力学.PDF

第26 卷第8 期 岩 土 力 学 Vol.26 No.8 2005 年8 月 Rock and Soil Mechanics Aug. 2005 文章编号：1000－7598 －(2005) 08―1269―05 粉煤灰、粘土、膨润土等对Zn2+ 的吸附试验研究 席永慧，赵 红，胡中雄 （同济大学，上海 200092 ） 摘 要：研究了粉煤灰、粘土、膨润土等从溶液中去除有毒金属离子Zn2+ 的吸附过程。动态试验显示吸附过程是快速的。吸 附试验结果表明，粉煤灰、膨润土对Zn2+ 的吸附能力相当，但远大于粘土、粉质粘土。平衡吸附模型充分说明，在高浓度下 Zn2+在粉煤灰、粘土、粉质粘土上的吸附符合 Langmuir 等温线。试验结果亦表明，随着吸附剂中Zn2+含量的增加，粉煤灰 等吸附剂对Zn2+ 吸附的百分率均呈减小的趋势。 关 键 词：粉煤灰；Zn2+ ；吸附；等温线 中图分类号: TU 411.1 文献标识码：A 2+ Study on sorption of Zn by fly ash, clay and bentonite XI Yong-hui, ZHAO Hong, HU Zhong-xiong (Tongji University, Shanghai 200092, China) Abstract : Sorption of Zn2+ from aqueous solutions by fly ash, clay and bentonite was investigated. The results of kinetic experiments showed that the sorption process of Zn2+ was rapid. The sorption data showed that sorption capacity of Zn2+ by fly ash and bentonite was much larger than those by clay and silty clay; and the sorption capacity of Zn2+ by fly ash was equal to that by bentonite. Equilibrium modeling of sorption showed that at high concentration，the sorption of Zn2+ by fly ash, clay and silty clay were fit