Regresar

Adsorption and recovery of cadmium and copper ions in mono and bicomponent systems using peanut shells biochar as a sustainable source: model development

Abstract:

This study evaluates the adsorption efficiency of Cd2+ and Cu2+ by peanut shell biochar (BPS) in monocomponent and bicomponent systems. The characterization indicated that BPS was mesoporous and amorphous, with presence of hydroxyl and carboxylic functional groups, with a pHPZC of 7.9. The effects of pH, stirring speed and adsorbent dosage were investigated, and the best results were obtained at pH 5.9, 200 rpm and 2 g·L−1. In monocomponent systems, the Elovich and BET models had the best adjustment, obtaining maximum adsorption capacity of 0.39 mmol·g−1 for Cd2+ and 0.48 mmol·g−1 for Cu2+, and the adsorption process was spontaneous and endothermic. With regard to bicomponent systems, a model was developed in order to pbkp_redict the evolution and equilibrium of kinetics. BPS had regeneration potential after desorption. These results demonstrate the viability of the use of BPS for the adsorption of Cd2+ and Cu2+ in both systems.