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Issue 35, 2019
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Exploring the mechanism of hypochlorous acid decomposition in aqueous solutions

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Abstract

Hypochlorous acid is an intermediate in important industrial processes such as the production of chlorate but is also used for water treatment and disinfection. In aqueous solutions hypochlorous acid may decompose into oxygen or chlorate. Using density functional theory (DFT) modelling we have for the first time established detailed mechanisms for the respective decomposition pathways. Our calculations indicate, that both oxygen and chlorate formation proceed through an identical set of intermediates. At neutral pH the reaction is initiated by a fast equilibrium between HOCl, OCl, Cl2O and Cl3O2. The subsequent abstraction of Cl to form Cl2O2 is rate determining for chlorate formation while it is the decomposition of Cl2O2 in the case of oxygen formation. Under alkaline conditions, OCl decomposition to chlorate proceeds through chlorite. This reaction path is significantly less active. The highest rate for chlorate or oxygen formation is found at pH 7.1. These results highlight the need to consider a complex mixture of different Cl species when addressing the chemistry of hypochlorous acid containing solutions.

Graphical abstract: Exploring the mechanism of hypochlorous acid decomposition in aqueous solutions

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Supplementary files

Article information


Submitted
18 Jun 2019
Accepted
19 Aug 2019
First published
21 Aug 2019

Phys. Chem. Chem. Phys., 2019,21, 19342-19348
Article type
Paper

Exploring the mechanism of hypochlorous acid decomposition in aqueous solutions

M. Busch, N. Simic and E. Ahlberg, Phys. Chem. Chem. Phys., 2019, 21, 19342
DOI: 10.1039/C9CP03439K

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