The adsorption of cationic dyestuffs (Basic Blue 69 and Basic Red 22) from aqueous solution by natural and activated clays has been investigated. The maximum adsorption capacity (qmax) of BB 69 and BR 22 on to natural clay was 390 mg/g and 365 mg/g, respectively. The natural clay was treated with H2O2 and HCl to enhance its adsorption capacity for dyestuffs. The efficiency of activation with H2O2 was greater by a factor of 23% and 13% in the case of BB 69 and BR 22, respectively, when compared with natural clay. The efficiency of activation with HCl was superior by 30% and 16% in the case of BB 69 and BR 22, respectively, relative to natural clay. The adsorption capacity has been correlated with the pore structure and the surface charge. The results obtained show that the adsorption capacity is independent of the SBET values but depends on the surface charge.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.