Adsorption Kinetics Modelling in Batch Reactor onto Activated Carbon by the Model HSDM

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Abstract
The aim of this work was to simulate adsorption kinetics in batch reactor onto activated carbon by the HSDM model (Homogeneous Surface Diffusion Model) in a range of aromatic compounds. The parameters of the model kf and Ds have been determined by a computer program HSDM.FOR in which some numerical methods were used. These methods allow us to “visualize” in orthogonal allocation positions the evolution of adsorbed concentrations in the grain of activated carbon. The values obtained for kf are about 3.1 × 10−3 (cm.s−1). But for Ds, there is a correlation between Ds and qe which can be described by the Aguwa relation (1986). According to the results calculated, a phenomenon of the supersaturation in the surface in preliminary kinetic period was observed. The initial concentration plays a role in the kinetic process. We have not only confirmed the mechanism of solute accumulation in the grain of activated carbon proposed by Le cloirec (1983), but also verified the hypothesis of the existence of a parabolic partition of adsorbed concentrations in the grain with a great initial concentration suggested by Yonge (1985).

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