Abstract
Oxidation kinetics of triethanolamine by ceric ammonium sulfate in aqueous sulfuric acid has been studied spectrophotometrically in contexts of many physicochemical processes. Stoichiometry of the reaction is found to be 1:6. Contrary to the literature findings the reaction proceeds without the presence of any transition metals acting as catalysts. Oxidation kinetics shows unit order dependence on oxidant, Ce(IV) and substrate, triethanolamine as well. Complex, fractional inverse order dependence on [H+], unaltered rate in the presence of added products at the initial stage and inverse dependence on added salt, sodium bisulfate are the findings. With increase in the solvent polarity, rate of the reaction also increased. Activation and thermodynamic parameters are computed from the temperature dependence observations. Suitable kinetic model and explanations are provided considering all the findings with a proposal of formation of an activated complex of the type [Ce(IV)-triethanolamine].
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The authors are thankful to Prof. Sreelekha Das Bhattamisra (Retd), Department of Chemistry, Berhampur University for providing the laboratory facilities, giving valuable inputs to execute the work and preparing the manuscript as well.
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Padhy, R.K., Sahu, S. Oxidation of triethanolamine by ceric ammonium sulfate in aqueous sulfuric acid: spectrophotometric kinetic and mechanistic study. Monatsh Chem 153, 69–78 (2022). https://doi.org/10.1007/s00706-021-02874-9
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DOI: https://doi.org/10.1007/s00706-021-02874-9