【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。更多还原

【Abstract】 Using the method of static adsorption,studying the adsorption kinetics and thermodynamics of cadmium in loess soils. Study shows that adsorption behavior of Cd2 +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 Cd2 +on loess soil will be increased,and it will reached equilibrium after 120 min. The adsorption capacity and consistence of Cd2 +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 Cd2 +in loess soil,the coexistence ions in Cd2 +solution such as Mn2 +,Ca2 +and Na+have different effects on the adsorption of Cd2 +on loess soil.更多还原