This paper investigated the effect of cationic polymers(CTAC,MTAB and DTAB) on granular activated carbon(GAC) and Cr(VI) removal by these modified carbons.The purpose was to develop an adsorbent that could effectively remove Cr(VI).Adsorption balance tests were conducted to compare the adsorption capacities of virgin GAC and GACs modified to three cationic polymers.The results showed that cationic polymer modification was able to greatly improve carbon's adsorption for Cr(VI).In addition,CTAC modified GAC m...