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Decomposition of ozone in water: rate of initiation by hydroxide ions and hydrogen peroxide

Staehelin, Johannes., Hoigne, Juerg.·1982·Environmental Science & Technology
DOI 10.1021/es00104a009
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Abstract

The initiation of ozone decomposition in "pure water" is first order in O3 and OH- concentration and kO3,OH- becomes 70 ± 7 M-1 s-1 when a sequence of reactions is assumed by which three molecules of O3 are eliminated per primary event. The difference between this value and higher values reported in the earlier literature may be explained by interferences by radical chain reactions which have not been totally inhibited in those studies. H2O2 also reacts with O3 when present as an anion, HO2-. kO3,OH- is (2.8 ± 0.5) × 106 M-1 s-1 when it is assumed that 'two molecules of O3 are eliminated per primary event. Therefore, whenever [H2O2] > 10-7 M (pH <12), HO2- has a greater effect than OH- on the decomposition rate of O3 in water. The high reactivity of HO2- explains that H2O2 is observed as a significant intermediate in the ozonated water only if the pH is low, e.g., <6.

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  • The utilization of light as an essential factor in photocatalysis allows for the possibility of designing the reactor or photocatalyst to enable the utilization of sunlight as a cost-effective energy source to drive the reaction.

    “The utilization of light as an essential factor in this process allows for the possibility of designing the reactor or photocatalyst in a manner that enables the utilization of sunlight as a cost-effective energy source to drive the reaction [270].”

    From Recent Advances in the Remediation of Textile-Dye-Containing Wastewater: Prioritizing Human Health and Sustainable Wastewater Treatment (2024) · cites this paper as [270]

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Metadata

Authors
Staehelin, J., & Hoigne, J.
Venue
Environmental Science & Technology
Publisher
American Chemical Society (ACS)
Published
1982-10
Volume
16
Issue
10
Pages
676-681
ISSN
  • 0013-936X
  • 1520-5851
DOI
10.1021/es00104a009
Cited by
1,235
References
0
Language
en

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