Dynamic Adsorption on Fixed-Bed Column of Manganese Oxoanions (MnO<SUB>4</SUB><SUP>-</SUP>) in Aqueous Media on Activated Carbon Prepared from Palm Nut Shells

International audienceThe study of the influence of operating parameters of dynamic adsorption on fixed-bed column of manganese oxoanions (MnO 4-) in aqueous media on granular activated carbon (GAC), prepared from the shells palm nuts of Gabon, was carried out. The operating parameters studied were the particle size, the concentration of the initial solution (C 0) of MnO 4-, the flow rate (D) and the pH of the media. The results obtained on the study of the influence of operating parameters show that the best adsorption capacities at saturation (Q sat) of MnO 4-ion on the CAG were obtained with particle size between 0.04 < x < 0.1 (5.90 mg.g-1); with flow rate of 3 mL.min-1 (8.36 mg.g-1) and when the pH of the initial solution was equal to 3.5 (27.01 mg.g-1). Also, these results showed that the bed of prepared GAC appeared more effective when C 0 was low (10 mg.L-1). The kinetic models of the different studies carried out show that the pseudo-first-order kinetic model best describes the adsorption of MnO 4-ions on the GAC. The results of the intraparticle diffusion model indicate that the adsorption of MnO 4-follows a multi-step process and that the intraparticle diffusion is not the limiting step. In addition, the surface adsorption plays a predominant role in the adsorption mechanism of MnO 4-ions on activated carbon studied in fixed-bed column dynamics