Abstract

Erythrosine B is an important representative of the xanthene dye class, widely used in food, pharmaceutical and cosmetic industry. The local agriculture byproduct namely beans hulls was used to identify the interactions between the xanthene foods dye Erythrosine B with its components. The process was studied at natural solution pH (5.6) and a sorbent dosage of 20 g/L representing the favorable adsorption conditions established in the previous investigations. The amount of dye adsorbed was found to vary with initial dye concentration and contact time. The data obtained from Erythrosine B sorption onto beans hulls was interpreted using four types of kinetics models: Lagergren pseudo-first-order, Ho’s pseudo-second-order, Elovich and Weber and Morris intraparticle diffusion model. According to the values obtained for correlation coefficient (R2>0.99), the adsorption data fitted the pseudo-second-order model. The two and three linear section with different slope (for concentration higher than 10 mg/L) was assigned to two/three interparticle diffusion steps occurring during the adsorption process of the dye. The rate of Erythrosine B uptake onto beans hulls was found to be controlled by intraparticle diffusion considering that at last one stage has negative intercept values for three (10 mg/L, 30 mg/L and 50 mg/L) of the five studied concentrations.

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