土壤中腐殖酸对汞的吸附特性研究  

Adsorption Characteristics and Kinetics of Mercury on Humic Acids in Soil

作　　者：冯素萍[1] 刘慎坦[1] 

机构地区：[1]山东大学环境科学与工程学院,山东济南250100

出　　处：《土壤通报》2009年第4期941-944,共4页Chinese Journal of Soil Science

摘　　要：采用静态吸附法研究了汞在腐殖酸上的吸附特性及动力学特征,结果表明常温下平衡吸附量随温度的升高而增加,温度大于20℃以上,吸附反应受温度的影响较小。溶液pH在5～9范围内,具有较高的吸附效率,有利于腐殖酸对汞吸附。吸附过程符合伪二级吸附速率方程,吸附速率常数k2随初始浓度的增加而减小,吸附过程属于化学吸附;符合Freundlich型吸附等温线。The adsorption characteristics and kinetics of humic acids （HAs） to mercury in aqueous solution was studied using static adsorbing method. The results show that the equilibrium adsorbing amount （qr） increases with the increase of temperature below 20℃, whereas the temperature hardly affects the sorption above 20℃. The adsorbility is optimal in the range of pH 5-9. The adsorption process follows a pseudo second-order kinetic rate equation. With initial Hg2＋ concentration increasing, the rate constant k2 decreases, which being related to uptake fraction F and the time to reach F （tF）. And the isothermal adsorption curve of it proves to be well matched with the Frundlish equation.

关 键 词：腐殖酸 汞 吸附动力学 速率常数 

分 类 号：S151[农业科学—土壤学]