Solar photocatalyzed red dye destruction using a titanium dioxide suspension
AuthorSjogren, Jon Charles, 1953-
AdvisorSierka, Raymond A.
MetadataShow full item record
PublisherThe University of Arizona.
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.
AbstractThe destruction of Direct-Red #79 textile dye in dilute aqueous solution was demonstrated by heterogeneous solar photocatalysis over suspended titanium dioxide. Dye oxidation and adsorption mechanisms, TiO2 photocatalysis, and external oxidant (H2O2) addition are discussed. Experimental data are presented which support previous studies reporting first order destruction of organic contaminants using recirculating batch reactor systems. The observance of optimum catalyst concentration, and reaction rate conformance to the Langmuir-Hinshelwood kinetic model were similar to results obtained by others. Dye destruction by free radicals was investigated. Evidence suggesting involvement of these processes is proposed by relating the rate of dye destruction to solution pH and alkalinity levels. Enhancement of dye destruction rate upon hydrogen peroxide addition was examined. Results of total organic carbon analyses, spectrophotometric absorbance measurements, and molecular weight estimations suggested the formation of reaction intermediates and indicated the extent of dye oxidation.
Degree ProgramGraduate College
Civil Engineering and Engineering Mechanics