Inderscience Publishers

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

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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 (ΔG
0
< 0), endothermic in nature (ΔH
0
> 0), and accompanied by an increase in entropy (ΔS
0
> 0).

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

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