Kinetic study of competitive CO2+ and Sr2+sorption by bauxite residue

Multi-component sorption studies are essential to identify the applicability of red mud as a low-cost sorbent for the simultaneous removal of metal ions from wastewaters. Sorption kinetics of Co2+ and Sr2+ionswas studied, at their different molar ratios in the mixture. The pseudo-second-order rate model best described the kinetics of metal sorption from binary metal systems. The increase of initial concentration of each cationin the mixture provoked its increased sorption capacity, but decreased sorption rate. Co2+sorption was superior in terms of both the rate and the capacity, therefore exertedstrong inhibitory effect on Sr2+sorption