固液体系中锌离子的动态吸附过程及去除率  

ADSORPTION KINETICS OF Zn^(2+) AND ITS REMOVAL RATE IN LIQUID/SOLID SYSTEMS

作　　者：赵崇[1] 吴晓芙[1] 周海兰[1] 赵芳[1] 

机构地区：[1]中南林业科技大学,湖南长沙410004

出　　处：《水处理技术》2008年第1期26-30,共5页Technology of Water Treatment

基　　金：引进国际先进农业科学技术计划(948)项目(2005-02);湖南省教育厅产业化推广项目(湘教发2003-101)

摘　　要：在离子浓度50～200 mg/L和蛭石介质浓度50～150 g/L范围内分析测试了固液体系中Zn2+离子的吸附速率。结果表明,蛭石具有较强吸附Zn2+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8 h左右趋于零。溶液起始Zn2++浓度和吸附剂浓度对吸附速率有显著影响,随起始Zn2+浓度增大,吸附达到平衡的时间延长;起始吸附剂浓度越大,吸附平衡时间越短。本文提出的蛭石吸附Zn2+的动态方程在样品检测的浓度范围内具有较高的模拟精确度。中试监测结果表明,人工湿地系统中的蛭石吸附单元可有效去除实验室废水中的锌与其它有毒污染物质。Kinetics of Zn^2＋ adsorption on vermiculite in liquid/solid systems was studied in the range of Zn^2＋ concentration 50-200 mg/L and adsorbent concentration 50-150 g/L. The experimental results showed that the vermiculite mineral with a high adsorption capacity could be well used as an adsorbent to remove Zn^2＋ from wastewaters. The adsorption rate was very high in the first 120 min. After that period, the adsorption rate gradually decreased and finally approached to zero at approximately 8 h. Influences of initial Zn^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 Zn^2＋ concentration levels but shorter at higher adsorbent concentration levels. The dynamic adsorption model proposed in this paper was found to fit well the experimental data at relatively high level of accuracy within the tested range. Results from the pilot study indicated that the vermiculite-adsorption treatment cell in a multiple wetland system was effective to remove zinc and other hazard pollutants from lab wastewaters.

关 键 词：动态吸附 ZN^2+ 蛭石 实验室废水 人工湿地 

分 类 号：TQ424.4[化学工程]