KINETICS AND ISOTHERMS STUDIES OF THE ADSORPTION OF Cr6+, Mn2+ and Cd2+ ions ONTO CHEMICALLY MODIFIED BOMBAX BUONOPOZENSE CALYX

Abstract

The potential of chemically modified Bombaxbuonopozense Calyx to adsorbed Cr 6+ , Mn 6+ and Cd6+ ions from aqueous solutions are prime intent in batch experiments. In this study, chemically modified activated carbon (AC) functionalized with H2SO4 (ACH) and KOH (ACK) usedin batch absorption process is reported. The pseudo first, pseudo second, Natarajan and Khalaf first, Bhattacharya and Venkobachar first, elovcih and intraparticle diffusion models rate equations were tested on kinetic data and the adsorption followed the pseudo second order rate kinetics. The isotherm data were analysed for possible agreement with the Halsay model than Hurkins-Jura, Radlich-Peterson and Dubinin-Radushkevich models. Correlation coefficient (R 2 ) valuesobtained isotherms range from 0.799 – 0.997. The results indicate high prospect of chemically modified Bombax buonopozense Calyxfor Cr 6+ , Mn 6+ and Cd 6+ ions removal