Coupling between nucleation and chemical reactions and its importance in understanding the oxidation of iodine by hydrogen peroxide

We have investigated the reaction of iodine with hydrogen peroxide coupled to gas nucleation. A step-like increase in the nucleation rate with increasing amounts of dissolved oxygen can act as a trigger for the formation of highly reactive components and complete oxidation of iodine to iodate despit...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2022-06, Vol.24 (22), p.1422-1432
Main Authors: Stanisavljev, Dragomir, Taylor, Annette Fiona, Bubanja, Itana Nua
Format: Article
Language:English
Subjects:
Chemical reactions
Coupling
Dissolved oxygen
Hydrogen peroxide
Iodine
Nucleation
Oxidation
Reaction mechanisms
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Summary:We have investigated the reaction of iodine with hydrogen peroxide coupled to gas nucleation. A step-like increase in the nucleation rate with increasing amounts of dissolved oxygen can act as a trigger for the formation of highly reactive components and complete oxidation of iodine to iodate despite the large thermodynamic barrier for the whole process. Energetic coupling of nucleation with chemical reactions is based on local redistribution of energy by collapsing unstable nuclei. The developed model correctly describes the evolution of the measured reaction parameters. It offers a conceptual improvement of formal-kinetic models by drawing attention to important contributions of physical effects to the reaction mechanism. A physicochemical model of iodine oxidation with hydrogen peroxide is extended by heterogeneous processes, conceptually improving the understanding of the reaction mechanism.
ISSN:1463-9076
1463-9084
DOI:10.1039/d2cp00962e