粉煤灰、粘土、膨润土等对Zn^(2+)的吸附试验研究  

Study on sorption of Zn^(2+) by fly ash, clay and bentonite

作　　者：席永慧[1] 赵红[1] 胡中雄[1] 

机构地区：[1]同济大学,上海200092

出　　处：《岩土力学》2005年第8期1269-1272,1287,共5页Rock and Soil Mechanics

基　　金：上海市科技发展基金资助项目(No.022312202)。

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。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 fitted to a Langmuir isotherm. The results also showed that when Zn2+ loading in adsorbents increased, the percentage of Zn2+ sorption by adsorbents such as fly ash decreased.

关 键 词：粉煤灰 ZN^2+ 吸附 等温线 

分 类 号：TU411.1[建筑科学—岩土工程]