Title: Adsorption kinetics and thermodynamics of anionic dyes onto sewage sludge derived activated carbon

Authors: Jian-kun Xie, Qin-yan Yue, Bao-yu Gao, Qian Li

Addresses: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; School of Environmental Science and Engineering, Shandong University, Jinan 250100, China. ' School of Environmental Science and Engineering, Shandong University, Jinan 250100, China. ' School of Environmental Science and Engineering, Shandong University, Jinan 250100, China. ' School of Environmental Science and Engineering, Shandong University, Jinan 250100, China

Abstract: The adsorption kinetics and thermodynamics of two anionic dyes (Reactive Brilliant Red K-2BP and Acid Scarlet GR) on the Sewage Sludge Derived Activated Carbon (SAC) were studied by batch adsorption tests. It was found that, for Reactive Brilliant Red K-2BP, four kinetic models, i.e., the pseudo-second-order model, the modified pseudo-first-order model, the pseudo-first-order model, and the intra-particle diffusion model, all showed acceptable applicability for the adsorption process. For Acid Scarlet GR, the adsorption process conformed only to the pseudo-second-order kinetic model. The adsorption processes of two dyes on the SAC were spontaneous (ΔG0 < 0), endothermic in nature (ΔH0 > 0), and accompanied by an increase in entropy (ΔS0 > 0).

Keywords: sewage sludge; activated carbon; dye adsorption; adsorption kinetics; thermodynamics; isotherm; anionic dyes; kinetic modelling; batch adsorption tests; dye wastewater; wastewater treatement.

DOI: 10.1504/IJEP.2011.039090

International Journal of Environment and Pollution, 2011 Vol.45 No.1/2/3, pp.123 - 144

Available online: 16 Mar 2011 *

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