REMOVAL OF HEXAVALENT CHROMIUM FROM AQUEOUS-SOLUTIONS BY GRANULAR ACTIVATED CARBON

Batch absorption trials were used to assess the effectiveness of using activated carbon as a sorbent for the removal of hexavalent chromium from solution. The results show that, although the pH for maximum effi ciency varied slightly with the concentration of Cr(VI) being applied, the most effective pH was in the range 2.5 to 3.0. Based on linear re gression analysis, the data obtained from the batch studies showed a g ood compliance with both the Langmuir and the Freundlich equations. Th e values obtained for the isotherm constants showed that the maximum a dsorption capacity. X(m), was 145 mg/g. An examination of the adsorpti on kinetics was also made and an analysis of the data shows that pore diffusion is not the only factor governing the sorption rate.