Effects of Temperature and Humic Acid on Adsorption-desorption of Hg2+in Brown Soil
The effects of temperature and humic acid on Hg2+sorption-desorption in brown soil were also studied.The results showed that the Freundlich and Langmuir equations were the best for the isothermal adsorption of Hg2+on brown soil at different temperatures,followed by the Henry and Temkin equations.Humic acid promoted the adsorption of Hg2+in brown soil and weakened the desorption of Hg2+.With an increase in reaction temperature,the adsorption capacity of Hg2+in brown soil increased and the desorption capacity decreased.There was a good correlation between Hg2+adsorption and desorption quantity in brown soil at different temperatures.The adsorption of Hg2+by brown soil before and after adding humic acid was a spontaneous endothermic process.Temperature increase was beneficial for conducting the adsorption reaction.This can provide a theoretical reference for the study of Hg2+transport,transformation and plant toxicity in brown soil,as well as for environmental risk assessment.
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