Adsorption of Chromium onto Activated Alumina: Kinetics and Thermodynamics Studies. (1st February 2013)

• Record Type: Journal Article
• Authors: Marzouk, Ikhlass; Dammak, Lassaad; Hamrouni, Béchir
• Is Part Of: Water environment research. Volume 85:Number 2(2013)
• Page Start: 99
• Page End: 104
• Publication Date: 2013-02-01
• Subjects: Chromium (VI) -- activated alumina -- adsorption isotherm -- adsorption kinetic -- thermodynamic; Water quality management -- Periodicals; Water -- Purification -- Periodicals; Water -- Pollution -- Periodicals; Water -- Pollution; Water -- Purification; Water quality management; Sewage; Water Pollution; Periodicals; Electronic journals; Periodicals; 628.16
• DOI: 10.2175/106143012X13560205144137
• Languages: English
• ISSNs: 1061-4303

Abstract

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.