2014•Desalination and Water TreatmentOpen access

Kinetic and thermodynamic studies on the adsorption of U(VI) onto humic acid

Ling Li, Zhen Wei, Ziying Li, Juan Wang, Qisheng Zhou, Jian Guo

Abstract

Humic acid was applied to the adsorption of U(VI) from aqueous solution. Adsorption kinetics was determined from the experimental data, and the results showed that pseudo-second-order kinetic model matched well for the adsorption of U(VI) onto humic acid. Thermodynamic parameters including free energy, enthalpy, and entropy of adsorption were obtained, and all the results were in favor of the adsorption. It was found that the adsorption rate was the best at pH 5.0. It can be concluded from FT-TR spectra that there is chemical adsorption in the U adsorption.

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Key concepts: Adsorption, Humic acid, Enthalpy, Chemistry, Aqueous solution, Kinetic energy, Kinetics, Entropy (arrow of time)