The production of radical species during aqueous ozonation of illuminated titanium dioxide suspensions

Persistent Link:
http://hdl.handle.net/10150/278063
Title:
The production of radical species during aqueous ozonation of illuminated titanium dioxide suspensions
Author:
Hendricks, Kathryn Louise, 1967-
Issue Date:
1991
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
The combination of aqueous ozone, suspended titanium dioxide, and ultraviolet light with predominant wavelength of 254 nm was tested against other pairs of these three variables to determine if more radical species were produced. The addition of suspended and illuminated titanium dioxide did not affect the total or instantaneous transfer at the 95 percent confidence level measured in this research. Radical generation was suggested by the increased dissolved ozone decomposition with increased semiconductor concentration at pH 7.2 and the increase in ozone decomposition rate upon addition of 3.0 g/l TiO₂ to water pH 3.1. The presence of hydrogen peroxide in the suspensions may have assisted in the production of radicals by reacting with the semiconductor. The increased decomposition of glucose with 3.0 g/l TiO₂ also provided evidence that O₃/UV/TiO₂ led to the generation of more radical species.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Engineering, Civil.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College
Degree Grantor:
University of Arizona
Advisor:
Sierka, Raymond A.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleThe production of radical species during aqueous ozonation of illuminated titanium dioxide suspensionsen_US
dc.creatorHendricks, Kathryn Louise, 1967-en_US
dc.contributor.authorHendricks, Kathryn Louise, 1967-en_US
dc.date.issued1991en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThe combination of aqueous ozone, suspended titanium dioxide, and ultraviolet light with predominant wavelength of 254 nm was tested against other pairs of these three variables to determine if more radical species were produced. The addition of suspended and illuminated titanium dioxide did not affect the total or instantaneous transfer at the 95 percent confidence level measured in this research. Radical generation was suggested by the increased dissolved ozone decomposition with increased semiconductor concentration at pH 7.2 and the increase in ozone decomposition rate upon addition of 3.0 g/l TiO₂ to water pH 3.1. The presence of hydrogen peroxide in the suspensions may have assisted in the production of radicals by reacting with the semiconductor. The increased decomposition of glucose with 3.0 g/l TiO₂ also provided evidence that O₃/UV/TiO₂ led to the generation of more radical species.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectEngineering, Civil.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorSierka, Raymond A.en_US
dc.identifier.proquest1346739en_US
dc.identifier.bibrecord.b27279868en_US
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