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Application of Response surface Methodology for Optimization of Cr(III) and Cr(VI) Adsorption on Commercial Activated carbons

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Author Affiliations

  • 1 Department of Chemical Engineering, National Institute of Technology, Rourkela, Orissa-769008, INDIA

Res.J.chem.sci., Volume 2, Issue (2), Pages 40-48, February,18 (2012)

Abstract

Response surface methodology (RSM) involving D–optimal design was used to optimize the adsorption process of trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)) from aqueous solutions by commercial activated carbons. Influence of various process parameters such as initial metal concentration, pH, adsorbent dose, contact time, and type of adsorbent on adsorption process was investigated. From the analysis of variance (ANOVA) results, the significance of various factors and their influence on the response were identified. The regression coefficients (R2) of the models developed and the results of validation experiments conducted at optimum conditions for the removal of both Cr(III) and Cr(VI) indicate that the predicted values are in good agreement with the experimental results. Contour and response surface plots were used to determine the interaction effects of main factors and optimum conditions of process, respectively for the simultaneous removal of Cr(III) and Cr(VI).

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