黄土性土壤对Cd^(2+)的吸附研究  

Study on the adsorption behavior of Cd^(2+) on loess soil

作　　者：袁胜[1,2] 李梦耀[1,2] 李扬[1,2] 钱会[1,2] 马岚[1,2] 

机构地区：[1]长安大学环境科学与工程学院,陕西西安710054 [2]陕西省地下水与生态环境工程研究中心(长安大学),陕西西安710054

出　　处：《应用化工》2015年第10期1913-1915,1937,共4页Applied Chemical Industry

摘　　要：采用静态吸附方法,研究了镉在黄土性土壤中的吸附动力学与热力学。研究表明,镉在黄土性土壤中吸附的动力学模型符合双常数方程,热力学模型符合Langmuir和Freundlich方程。随着吸附时间的增加,黄壤对镉的吸附量增加,在120 min时基本达到平衡。黄壤中镉的浓度与吸附量成正相关,且在土壤表面,镉为单分子层吸附。Cd2+溶液中共存的Mn2+、Ca2+、Na+等离子对黄壤吸附镉产生不同的影响。Using the method of static adsorption,studying the adsorption kinetics and thermodynamics of cadmium in loess soils. Study shows that adsorption behavior of Cd^2＋ on loess soil in accordance with the two constant equation,thermodynamics model conforms to the Langmuir and Freundlich equation. With the increase of adsorption time,adsorption capacity of Cd^2＋ on loess soil will be increased,and it will reached equilibrium after 120 min. The adsorption capacity and consistence of Cd^2＋ in loess soil are positively correlated,and on the soil surface,cadmium is single molecule layer adsorption. After studying the interference ions influence on the adsorption of Cd^2＋ in loess soil,the coexistence ions in Cd^2＋ solution such as Mn^2＋,Ca^2＋ and Na^＋have different effects on the adsorption of Cd^2＋ on loess soil.

关 键 词：黄土性土壤 镉 吸附 动力学 热力学 

分 类 号：TQ457.1[化学工程—农药化工] O657.32[理学—分析化学]