Adsorption characteristics of activated carbon derived from scrap tires for malachite green: Influence of small organics

Abstract

The influence of small organics on the adsorption characteristics of activated carbon produced from industrial pyrolytic tire char (APTC)for malachite green (MG) was investigated by a batch method. Phenol was chosen as the representative of small organics. The effects of phenol on adsorption equilibrium, kinetics and thermodynamics were studied systematically. The results indicate that APTC is a potential adsorbent for MG. The presence of phenol decreases the adsorption capacity of APTC for MG, but improves the rate of adsorption, while the adsorption characteristics, such as equilibrium, kinetics and thermodynamics are not affected by phenol. The adsorption equilibrium data follow Langmuir isotherm and the kinetic data are well described by the pseudo-second-order kinetic model. The adsorption process follows intra-particle diffusion model and the adsorption rate is determined by more than one process. Thermodynamic study shows that the adsorption is an endothermic and spontaneous physisorption process.

Keywords

activated carbon / scrap tire / pyrolytic tire char / adsorption / malachite green / phenol

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