Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 52 for “"Photooxidation"”.
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Dye sensitized photooxidation of toxic organic wastewaters
Use of dye sensitized photooxidation is potentially a low cost means of degrading many of the hazardous compounds found in wastewaters. This study investigated the use of methylene blue as a sensitizer to degrade ortho-, meta-, and para-cresol, carbofuran and acrylonitrile. Significant reductions …
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Chemical and Physical Studies of Secondary Organic Aerosol Formed from Beta-pinene Photooxidation
… The NOx dependence of SOA formation from -pinene photooxidation was investigated in the York University smog chamber and the Jlich Plant Atmosphere Chamber (JPAC). Consistent with previous NOx studies, SOA yields increased with increasing [NOx] at low-NOx conditions, whereas increasing [NOx] at …
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Heterogeneous Photooxidation of Trichloroethene on Titanium Oxides Encapsulated in Zeolites L and Y
The room temperature heterogeneous photooxidation of Trichloroethene (TCE) on titanium particles (TiOx) encapsulated in zeolite pores was studied using Transmission FT-IR. The decomposition was performed by utlizing two distinctly different pore structures. These were the interconnected supercages …
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Photooxidation Reactions of Small-Chain Methyl Esters, Aerosol Photoelectron Spectroscopy, and the Photodissociation of Ethylenediamine
… this masters thesis, including the Cl-initiated photooxidation reactions of methyl propanoate, methyl butanoate, and methyl valerate (pentanoate), the aerosol photoelectron spectroscopy of isoprene and gamma-valerolactone, and the TPEPICO investigation of ethylenediamine. Experiments were …
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Photochemical Protection of Riboflavin and Tetrapyrroles with Light Scattering Technology
… (TiO?) in polyethylene films at preventing the photooxidation of riboflavin in a model solution was evaluated. Five different TiO? loads (0.5-8.0 wt%), each at 3 different thicknesses (50-100 um) were evaluated. A photochemical reactor, equipped with a 350W mercury lamp, provided full spectrum …
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Adsorption and photochemical transformation of polycyclic aromatic hydrocarbons on atmospheric water films
… dodecyl sulfate, was also studied. Several photooxidation products of naphthalene and phenanthrene were identified in the water films and the mechanism of photooxidation was assessed. The effect of singlet oxygen on PAH photooxidation was ascertained. The photooxidation of PAHs can be very …
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The role of copper in aquatic photochemistry of dissolved organic matter
… contaminants in seawater systems as well as the photooxidation of DOM itself. Also, Cu was found to act as a novel quencher to investigate the fundamental mechanism for the photobleaching and photooxidation of DOM from diverse sources in this thesis. In Chapter 2, the effect of nanomolar …
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The remineralization of marine organic matter by diverse biological and abiotic processes
… sinking particles, and abiotic processes such as photooxidation — remain poorly constrained. In this thesis, I examine the biogeochemical significance of various alternative pathways of organic matter remineralization using a combination of field experiments, modeling approaches, geochemical …
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The remineralization of marine organic matter by diverse biological and abiotic processes
… sinking particles, and abiotic processes such as photooxidation - remain poorly constrained. In this thesis, I examine the biogeochemical significance of various alternative pathways of organic matter remineralization using a combination of field experiments, modeling approaches, geochemical …
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Development and Evaluation of a Comprehensive Tropospheric Chemistry Model for Regional and Global Applications
… isoprene and a-pinene reactions. The isoprene photooxidation scheme is adapted for the present model from an available mechanism in the literature, while an a-pinene photooxidation mechanism, capable of predicting secondary organic aerosol formation, is developed for the first time from the …
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Selenium-induced Enhancement of Hematoporphyrin Derivative Phototoxicity in Murine Bladder Tumor Cells
… emission of Hpd and augment the Hpd-sensitized photooxidation of tryptophan. The data indicate that sodium selenite is able to disaggregate Hpd, thereby enhancing Hpd-sensitized phototoxicity.</p>
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Modified ldh-supported au catalystssynthesis, characterization and catalytic performances in furfural liquid phase oxidation and hydrogenation
… LDH for hydrogenation. Besides these studies, a photooxidation study of glucose was also performed over the Au/NiAlZr catalyst, where light activation resulted in the improvement of catalytic performance. Characterization by IR, XRD, BET, SAA, SEM, TEM, and UV-visible techniques is performed in …
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A Study of the Role of Hydroperoxides in the Degradation and Stabilisation of Polymers
… vinylidene, and vinyl formed during the photooxidation of the polymer were studied and compared. The effect of metal complexes, which are supposed to be effective photoactivators for the autoxidation of polyethylene, was also studied. The efficiency of these complexes as well as …
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Molecular, cellular, and circuit analysis of C. elegans spitting behavior
… response to noxious chemical products of photooxidation (Bhatla and Horvitz, 2015).
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Enhanced physicochemical and functional properties of pea (Pisum sativum) protein by pH-shifting and ultrasonication combined process
… loaded with vitamin D3 (VD3). Storage stability, photooxidation protective ability, and morphological structure of the PPI-stabilized nano-systems were examined. The pH12+U5 treatment increased the solubility of PPI from 8.17% (Control) to 60.83%, and reduced the volume-weighted mean diameters D …
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Singlet Oxygen Generation Via Irradiation of 4-Benzylamino-7-Nitrobenz-2-Oxa-1, 3-Diazole
… was first approached using the sensitized photooxidation method of singlet oxygen detection with 1, 3-cyclohexadiene (CHD) as acceptor. A reaction between BBD and the acceptor rendered this method of singlet oxygen detection useless. In a second approach, the rate of light-induced oxygen …
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The ecological significance of leaf movements in Rhododendron maximum
… balance and/or avoiding photoinhibition and photooxidation. A series of leaf manipulation treatments were established to verify these potential explanations. These leaf treatments were designed to separate the influence of leaf curling and leaf angle on leaf energy budget, gas-exchange …
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Melt Processable Poly(acrylonitrile)-based Precursors for Carbon Fiber Production and Advanced Polymeric Membranes for Gas Separation and Water Electrolysis Applications
… This induced crosslinking and, in some cases, photooxidation. Gas permeability decreased and O2/N2 selectivity increased as UV irradiation and aging time were increased. At 254 nm, samples irradiated in air had lower permeability coefficients and higher selectivities than samples irradiated in …
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Design of band-engineered photocatalysts using TiO2
… using the model case of methylene blue photooxidation over thin-film anatase TiO2 grown by atomic layer deposition. The near-surface electric field was controlled by tuning the space charge layer width through varying the bulk carrier concentration and the surface potential. The carrier …
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Novel infrared spectroscopic techniques for the study of adsorbed proteins on photoactive thin films
… such as an in situ monitoring of the photooxidation of surface-bound hydrogenases.
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