Investigation of the effect of structure on reactivity in the titanium dioxide mediated photodecomposition of phenols and haloethers when irradiated at 350 NM in an aqueous medium
Master of Science (MS)
First Advisor's Name
Kevin E. O'Shea
First Advisor's Committee Title
Second Advisor's Name
Ramon Lopez de la Vega
Third Advisor's Name
William J. Cooper
Fourth Advisor's Name
Water -- Purification -- Photocatalysis, Water -- Purification -- Organic compounds removal, Titanium dioxide
Date of Defense
Three studies were performed to obtain fundamental mechanistic information on the TiO2 catalyzed photooxidations of organic substrates irradiated at 350 nm in dilute aqueous solutions under oxygenated conditions: (a) The photodecomposition of three haloethers, 2-chloroethyl ether, 4-chlorophenyl phenyl ether, and 4-bromophenyl phenyl ether, was investigated in an aqueous media at pH 7.0. (b) A comparative study of structure-reactivity was conducted on para-substituted phenols whose substituents range from electron-withdrawing to electron-donating in an aqueous media at pH 3.0. (c) The initial rates of the TiO2 catalyzed photodegratation of phenol were studied in an aqueous media at pH 1.0, 3.0, 5.0, 7.0, 9.0, 11.0, and 13.7 and a pH effect profile was obtained and compared to the removal efficiency after four hours of irradiation. Controls were carried out throughout the three studies in the absence of light and under anoxic conditions, as well as without the semiconductor to evaluate the role of photolysis. The Langmuir-Hinshelwood model was employed in an attempt to characterize and evaluate differences in reactivity.
Cardona, Claudia, "Investigation of the effect of structure on reactivity in the titanium dioxide mediated photodecomposition of phenols and haloethers when irradiated at 350 NM in an aqueous medium" (1994). FIU Electronic Theses and Dissertations. 2044.
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