腐植酸在土壤中对Cu^(2+)的吸附特性影响

Adsorption Characteristic of Cu on Loess Soil Affected by Humic Acid

研究了腐植酸对Cu2+在土壤上吸附特性以及相关因素的影响。结果表明,在等温吸附实验中,无论是否加入腐植酸,Cu2+的吸附都能够较好地符合Freundlich方程;并且Cu2+在供试土样上的吸附量随温度升高而降低,表明吸附为放热过程。在吸附动力学实验中,不加腐植酸时,Cu2+在供试土样上的吸附动力学最优方程为Elovich方程,加入腐植酸溶液后,吸附动力学最优方程为一级动力学方程,且Cu2+的吸附平衡时间明显缩短。随着加入腐植酸量的增加,土壤样品对Cu2+的吸附量明显增加。

Study on the effect of humic acid on adsorption characteristics and related factors of Cu in soil.. The results showed that, in the isothermal adsorption experiments, regardless of whether or not to join the adsorption of humic Cu2 ＋, are better able to comply with Freundlich equation no matter with or without humic acid; The adsorption capacity of Cu reduced with increasing of temperature, indicating that adsorption of Cu was an excergic process~ The adsorption kinetics of Cu best fitted with Evolich kinetics equation, but at presence of humic acid, it changed to double constant equation. The adsorption speed of Cu was faster than that without humic acid. The adsorption capability of Cu increased with humic acid concentration.