Effect of characteristics of activated carbon on removal of bromate

This study evaluates how the characteristics of activated carbon (AC) influence the adsorption–reduction of bromate (BrO3−) by performing inetic and isotherm tests. Experimental results reveal that both physical and chemical effects simultaneously affect the adsorption–reduction rocess. The wood-based carbons contained more mesopores than coconutand coal-based carbons, resulting in the adsorption of more BrO3−. he equilibriumand maximum-adsorption capacities were calculated as a function of the effect of mesopore volume. The carbon surface chemistry eems to be significant in the adsorption–reduction process. Activated carbons with high pH values and many basic groups exhibit a neutral or zpc ositive charge under typical pH conditions, promoting BrO3− adsorption–reduction at the carbon surface. The kinetic data obtained from three orms of carbons have been analyzed using three kinetic models—pseudo-first-order, pseudo-second-order and intraparticle diffusion models. mong the kinetic models studied, the intraparticle diffusion was the best applicable model to describe the adsorption of BrO3− onto AC. 2007 Elsevier B.V. All rights reserved.