Adsorption of dibutyl-phthalate on humic acid

Zhi-dang Yang1, Yang Wan1, Jiao-yan Song1, Chu Zhang1, Meng-zu Sui1, Zhi-jian Mu1,2, Shi-qiang Wei1,2, Qiang Wang1,2,3

1 College of Resources and Environment, Key Laboratory of Eco-environment in Three Gorges Reservoir Region(Ministry of Education), Southwest University, Chongqing 400716, China
2 Key Laboratory of Agricultural Resources and Environment, Chongqing 400716, China
3 Department of Agriculture & Environmental Science, Lincoln University of Missouri, Jefferson City, 65102,USA

Abstract


Behaviors of adsorption of di-n-butyl phthalate (DBP) on humic acid and the effects of temperature on these processes are studied by solid phase extraction-HPLC method. The results show that the adsorption amounts of DBP increase with increasing equilibrium-concentrations of DBP. Such results could be well described by Langmuir equation. The maximum adsorption amount (Qmax) and adsorption constant (k) at 35oC were both lower than those at 25oC. Thus, high temperature is unfavorable to the adsorption reaction.

Keywords


adsorption and desorption; DBP; humic acid; isothermal adsorption kinetics; thermodynamics

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