Adsorption of Chromium onto Activated Alumina: Kinetics and Thermodynamics Studies
Abstract:In this study, the removal of chromium (VI) by adsorption on activated alumina was investigated and the results were fitted to Langmuir, Freundlich, Dubinin-Redushkevich, and Temkin adsorption models at various temperatures. The constants of each model were evaluated depending on temperature. Thermodynamic parameters for the adsorption system were determined at 10, 25 and 40°C. (ΔH° = −21.18 kJ.mol−1; ΔG° = −8.75 to −7.43 kJ.mol−1 and ΔS° = −0.043 kJ.K−1.mol−1). The obtained values showed that chromium (VI) adsorption is a spontaneous and exothermic process. The kinetic process was evaluated by first‐order, second‐order and Elovich kinetic models.
Document Type: Research Article
Publication date: February 1, 2013
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