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Journal of Environment and Biotechnology Research

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Biosorption of chromium(VI) by coconut husk - optimization of adsorption variables and isotherm studies

Journal of Environment and Biotechnology Research, Vol. 7, No. 3, Page 45-53, Jul 2018

N. Sameera, S. Kiran, S.M. Desai

DOI: to be updated


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ABSTRACT

Hexavalent chromium, present in industrial effluents, is a cause of great concern due to its carcinogenicity and toxicity even at trace levels. The present study aimed at determining the feasibility of using adsorption as a method of Cr(VI) removal by using easily and cheaply available agricultural waste such as coconut husk as the adsorbent. Based on central composite design, values of independent variables viz. temperature, pH, initial metal ion concentration and adsorbent dosage were varied to study the Cr(VI) removal efficiency from aqueous solutions by three forms of the biomass - untreated, acid-treated and alkali-treated. The outcome was subjected to regression analysis and the second degree polynomial equation was found to fit the results to a great extent (R2 value > 0.9). The acid-treated form of coconut husk was found to be the best with maximum Cr(VI) removal capacity of 84.1% at 2.4 pH and 34.3 oC temperature, with highest initial metal concentration of 165.5 mg/L and lowest adsorbent usage of 4.89 g/100 mL. The impact of factors affecting the adsorption process, viz. temperature, pH, initial metal ion concentration and adsorbent dosage, was also studied. Further, isotherm studies were conducted which showed that the Langmuir Isotherm fitted the experimental data to a good extent with correlation coefficient R2 > 0.87.
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Journal of Environment and Biotechnology Research
Volume 7, Number 3, 2018, pp. 45-53
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