Distinguishing Kinetics and Mechanistic Approaches of Ce(IV) Efficient Oxidation of Cadaverine in HClO4 and H2SO4 Media

Abstract

The kinetics of highly efficient oxidation of cadaverine (CAD) by Ce(IV) in both HClO₄ and H₂SO₄ solutions were examined using UV–Vis absorption spectra at numerous temperatures. The last products of CAD oxidation were recognized as ammonia and 5-aminopentanal, that is, an essential organic compound in both biological and chemical settings. From the obtained data, it's clear that the reactions’ kinetics demonstrated a first-order dependence in [Ce^IV], where they exhibited lower than unit orders with regard to [CAD] over the studied concentration range. In HClO₄ and H₂SO₄, the oxidation reactions showed positive and negative incomplete unit orders in [H⁺], correspondingly. Based on the obtained results, the mechanistic reactions’ pathways were suggested. The reliable rate laws were derived, and the reactions’ rate constants were estimated. In addition, the activation and thermodynamic parameters were calculated and discussed. This study illuminated the role of the oxidant, medium, temperature, and other conditions on the oxidation kinetics and mechanisms of these redox systems.