固液体系中Cr(Ⅵ)吸附的动态模拟  

Simulation of the Kinetic Process of Chromium(Ⅵ)Adsorption in Liquid/Solid Systems

作　　者：芦鹏[1] 吴晓芙[1] 于旭彪[1] 赵芳[1] 

机构地区：[1]中南林业科技大学,湖南株洲412006

出　　处：《中南林业科技大学学报》2007年第1期118-123,共6页Journal of Central South University of Forestry & Technology

基　　金：948项目(2005-02)"水环境保护中的湿地技术";湖南省教育厅产业化推广项目(湘教发2003-101)

摘　　要：在离子质量浓度25～100mg·L^-1和红壤吸附剂质量浓度50～150g·L^-1范围内分析测试了固液体系中Cr（Ⅵ）的吸附速率．结果表明，红壤具有较强吸附Cr（Ⅵ）的能力，其吸附速率在初始2h内很高，但随时间的延长逐步降低并在10h左右趋向于零．溶液起始Cr（Ⅵ）浓度和吸附剂浓度对吸附速率有显著影响，随起始Cr（Ⅵ）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．提出的红壤Cr（Ⅵ）吸附的动态方程在样本检测的浓度范围内具有较高的模拟精确度．Chromium （Ⅵ） adsorption kinetics in liquid/solid systems was studied in the range of chromium （Ⅵ） concentration 25～100 mg·L^-1 and adsorbent （red soil） concentration 50～150 g·L^-1. The results show that the red soil samples with a high adsorption capacity can be well used as an adsorbent to remove chromium （Ⅵ） from wastewaters; and that the adsorption rate was very high in the first 2 hours but after that period it gradually descended and finally approached to zero after approximately 10 hours. Influences of initial chromium （Ⅵ） and red soil concentrations on the 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 chromium （Ⅵ） concentration levels but shorter at higher adsorbent concentration levels. The dynamic adsorption model proposed in this paper was found, within the tested range, to fit in the experimental data with a high accuracy.

关 键 词：环境工程 Cr(Ⅵ)吸附 固液体系 动态方程 红壤 

分 类 号：O647.3[理学—物理化学]