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Equilibrium sorption of hexavalent chromium from aqueous solution using synthetic hematite

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Abstract

Hematite sample prepared by transformation of ferrihydrite was used to remove Cr(VI) from aqueous solution. Effects of initial concentration, contact time, pH, ionic strength, and temperature were investigated. The data were fitted to Langmuir, Freundlich, Dubinin-Kaganer-Radushkevich and Temkin models of adsorption. The results showed the best fit to the Langmuir isotherm. The increase of pH as well as that of increasing ionic strength resulted in the decrease of adsoiption of Cr(VI). Two kinetic models namely pseudo-first order and pseudo-second order were used to fit the experimental data. The thermodynamic parameters were found, and the results indicated spontaneous and exothermic nature of the process.

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Authors and Affiliations

  1. Chemistry Department, University of Ilorin, Ilorin, Higeria

    H. I. Adegoke & F. A. Adekola

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  1. H. I. Adegoke
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  2. F. A. Adekola
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Correspondence to H. I. Adegoke.

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Adegoke, H.I., Adekola, F.A. Equilibrium sorption of hexavalent chromium from aqueous solution using synthetic hematite. Colloid J 74, 420–426 (2012). https://doi.org/10.1134/S1061933X12040035

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  • DOI: https://doi.org/10.1134/S1061933X12040035

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