The use of solution microcalorimetry to evaluate chemically modified fish scales as a viable adsorbent for heavy metals |
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Authors: | Karine O Moura Eunice F S Vieira Antonio R Cestari |
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Institution: | 1.Laboratory of Materials and Calorimetry, Department of Chemistry/CCET,Sergipe Federal University,S?o Cristóv?o,Brazil |
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Abstract: | Here, we report for the first time the direct and simultaneous determination of kinetic and energetic parameters of Cr(VI)
sorption on chemically modified fish scales (GA-scale) using solution microcalorimetry. Characterization has suggested that
electrostatic interactions between scales collagen positive charges and chromate negative charges constitute the majority
of the interactions. The microcalorimetric kinetic data of Cr(VI) sorption on GA-scale were successful adjusted to a three-parameter
exponential function. The enthalpies of Cr(VI) sorption on GA-scale are highly exothermic (from −226.43 to −183.79 kJ mol−1), and Cr(VI) interaction energies decrease as initial Cr(VI) in solution increases. The kinetic and thermodynamic from solution
microcalorimetry results suggest that the interactions GA-scale/Cr(VI) occur mainly by surface reactions. The maximum adsorption
capacity of GA-scale for Cr(VI) was found to be comparable with some commercial adsorbent samples. |
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