固液体系中蛭石吸附Cu^(2+)动力学研究  

Study on Kinetics of Cu^(2+) Adsorption on Vermiculite in Liquid/Solid Systems

作　　者：于旭彪[1] 吴晓芙[1] 芦鹏[1] 赵芳[1] 

机构地区：[1]中南林业科技大学,湖南株洲412006

出　　处：《湘潭大学自然科学学报》2007年第2期80-86,共7页Natural Science Journal of Xiangtan University

基　　金：948资助项目(2005-02);湖南省教育厅产业化推广资助项目(湘教发2003-101)

摘　　要：研究了等温条件下初始Cu2+浓度范围为25~300 mg.L-1,蛭石浓度范围为20~100 g.L-1的水溶液体系中蛭石吸附Cu2+的动力学过程.试验结果表明:蛭石对Cu2+具有较强的吸附能力,其吸附速率在吸附反应开始的2 h内很高,但随时间的延长逐渐降低并在12 h左右接近于零.溶液起始Cu2+浓度和吸附剂浓度对吸附速率影响显著,随起始Cu2+浓度增大,吸附达到平衡的时间延长;起始吸附剂浓度增大,吸附平衡时间缩短.提出的蛭石-Cu2+吸附动力学方程在样本检测的浓度范围内具有较高的精确度.Experiments were carried out to investigate the factors affecting Cu^2＋ adsorption kinetics in solid/liquid systems at constant temperature in the range of Cu^2 ＋ concentration 25 - 300 mg·L^-1 and adsorbent （ vermiculite ） concentration 20 -100 g·L^-1.The experimental results showed that the vermiculite mineral with a high adsorption capacity can be well used as an adsorbent to remove Cu^2＋ from wastewaters. The adsorption rate was very high in the first 2 h. After that period the adsorption rate gradually decreased and finally approached to zero at approximate 12 h. Influences of initial Cu^2＋ and vermiculite concentrations on adsorption rate were observed in the adsorption process. The trend was that the time needed for adsorption to reach its equilibrium was longer at higher initial Cu^2＋ concentration levels but shorter at higher adsorbent concentration levels. The dynamic adsorption model proposed in this paper was found to fit the experimental data at relatively high level of accuracy within the tested range.

关 键 词：吸附动力学 固液体系 CU^2+ 蛭石 

分 类 号：O647.31[理学—物理化学]