Thesis (Ph. D., Chemistry)--University of Idaho, May 2008. / Major professor: I. Francis Cheng. Includes bibliographical references. Also available online (PDF file) by subscription or by purchasing the individual file.

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Thesis (M.S.)--Mississippi State University. Department of Chemical Engineering. / Title from title screen. Includes bibliographical references.

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M.S. / Chemistry / Resonance Raman spectra of the complex of FeIII-ethylenediamine-tetraacetate with hydrogen peroxide have been obtained in the region of the peroxidic O-O stretching vibration that occurs at 815 cm [superscript -1] in frozen solution. When the complex was prepared from nearly neat, mixed-isotope hydrogen peroxide, H216O18O, a single O-O vibration was observed at 794 cm [superscript -1]. This observation establishes that the two oxygen atoms of the bound peroxide are equivalent and that the peroxide is ligated in an η2 side-on configuration in this mononuclear complex. The absence of any shift in υ(O-O) when the complex was prepared in D2O solvent provides further support for the Fe-OO geometry and rules out the alternative η1 end-on Fe-OOH configuration. In contrast, υ(O-O) of free hydrogen peroxide in the frozen state occurs at 877 cm [superscript -1] in H2Oand at 879 cm [superscript -1] in D2O. The 2- cm [superscript -1] upshift in D2O is similar to that observed previously with oxyhemerythrin and appears to be characteristic of a hydrogen-bonded or protonated peroxide species.

Metal-Ethylenediaminetetraacetic acid (EDTA) complexes are found in a variety of industrial process. The stability of the formed complexes makes these compounds often inert to conventional wastewater treatment systems. In this work, the photocatalytic oxidation of NiEDTA was investigated as a means of breaking up the chelated nickel. The studied variables included the light intensity rate, the catalyst (TiO2), oxygen and NiEDTA concentrations. Photocatalytic experiments showed that increasing the catalyst concentration (0.5-3.0 g/L) decreases the light penetration inside the reactor resulting in a decrease in the reaction rate. The effect of oxygen and NiEDTA concentration was shown to exhibit Langmuir-Hinshelwood type kinetics. Total organic carbon (TOC) did not show any significant mineralization of NiEDTA for all investigated conditions. As a result, the by-products of the reaction were measured and found to include ED3A (ethylenediaminetriacetic acid), N-N'-EDDA (ethylenediamindiaacetic acid), IDA (iminodiacetic acid), oxalic acid, oxamic acid, glyoxylic acid, formaldehyde, ammonia, nitrate and nitrite. ED3A was found to be the major by-product of the reaction and nitrogen added from NiEDTA was found to be released as ammonia nitrogen. Oxygen consumption experiments were demonstrated as an effective way to monitor the rate of the reaction through measurement of the electron oxygen utilization rate. Nickel precipitation experiments showed that some of the by-products of NiEDTA degradation formed complexes with nickel. Finally, a light distribution model was generated using a CFD software (Fluent 6.1.22). For the catalyst concentration range of 0.5 to 3.0 g/L, this model showed that all of the light energy supplied by a centered UV lamp is absorbed within a one centimeter distance. Using the local volumetric rate of energy absorption (LVREA) calculated from the model the rate of the reaction was expressed in terms of quantum yield. For experiments carried out with air the quantum yield showed that the degradation rate was limited from an insufficient oxygen supply for electron scavenging. Increasing the oxygen concentration to 0.60 mmole O2/L increased the quantum yield for the highest light intensity rate; however the quantum yield never reached an optimum value thus indicating that other limiting conditions exist.

Thesis (M.S.)--Oregon Graduate Center, 1988.

Thesis (Ph. D. in Microbiology)--Washington State University. / Includes bibliographical references.

Thesis (M. Sc.), Memorial University of Newfoundland, 1998. / Bibliography: leaves p. 184-193.