粉煤灰粘土粉质粘土膨润土对镍离子吸附试验研究  

Study on the adsorption of Ni^(2+) by fly ash, clay,silty clay and bentonite

作　　者：席永慧[1] 赵红[2] 胡中雄[3] 

机构地区：[1]同济大学建筑工程系,上海200092 [2]同济大学材料科学与工程学院,上海200092 [3]同济大学地下建筑与工程系,上海200092

出　　处：《岩土工程学报》2005年第1期59-63,共5页Chinese Journal of Geotechnical Engineering

基　　金：上海市科技发展基金资助项目(022312202)

摘　　要：研究了粉煤灰 、粘土、粉质粘土和膨润土从溶液中去除有毒金属镍离子的吸附过程。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、膨润土对镍离子的吸附能力远大于粘土和粉质粘土,且粉煤灰大于膨润土。平衡吸附模型充分说明在高浓度下,镍离子在粉煤灰 、粘土、粉质粘土及膨润土上的吸附最符合 Langmuir 等温线, 在粘土和粉质粘土上的吸附也可用线性和 Freundlich 等温线来表示。试验结果还表明:随着吸附剂中镍离子含量的增加,粉煤灰等吸附剂对镍离子吸附的百分数均呈减小的趋势。Adsorption of Ni(II) from aqueous solutions by fly ash, clay, silty clay and bentonite was investigated. The results of kinetic experiments showed that the adsorption process of Ni(II) was rapid. The adsorption data showed that adsorption capacity of Ni(II) by fly ash and bentonite was much larger than those by clay and silty clay, and adsorption capacity of Ni(II) by fly ash was larger than that by bentonite. Equilibrium modeling of the adsorption showed that at high concentration, the adsorption of Ni(II) by fly ash, clay, silty clay and bentonite was fitted to a Langmuir isotherm, while the adsorption of Ni(II) by clay and silty clay was also fitted to linear and Freundlich isotherm. The results also showed that when Ni(II) loading in absorbents increased, the percentage of Ni(II) adsorption by absorbents such as fly ash decreased.

关 键 词：粉煤灰 镍离子 吸附 等温线 

分 类 号：X53[环境科学与工程—环境工程]