Kinetic and thermodynamic study of adsorption of an industrial food dye using Iraqi clay

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Rehab Adel Mahmood
Suhad S. Mohammed


Erythrosine; Pollution; industrial food dye ; Adsorption; Bentonite.


Erythrosine was removed from its aqueous solution using the adsorption abilities of bentonite. The range for the maximum dye adsorption was shown to be between 36.68% and 44.82%. The findings of employing the Freundlich, Langmuir, and Temkin adsorption isotherms showed that the Freundlich model was followed, the Langmuir model did not match, and the Temkin model could only be partially applied at temperatures of (298,308,318) K. In addition it is physical adsorption. The results showed the applicability of the pseudo-second-order model, which was one of two kinetic models of the adsorption process tested. In this research. The process was shown to be exothermic when the thermodynamic functions were calculated using the value of the enthalpy Δ°H, which was negative and equal to (-35.6571 KJ/mol). The entropy Δ°S value, which equaled (- 129.6984 J/mole.K), was likewise negative. Gibbs free energy ΔG°was calculated and it was found that the reaction is non-spontaneous and that the reaction occurs with a lack of randomness and it is exothermic adsorption.

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