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 102 for “"Photodegradation"”.
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High-throughput Photodegradation of Plastics
Plastic is a critical resource in the modern world, but an emphasis on durability in design coupled with the widespread use of plastic products has led to significant accumulation of plastic waste in the environment. It is imperative that new chemistries are discovered to produce polymers with the …
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Spectrokinetic studies of the photostability and the photodegradation of Diethylstilbestrol
… been carried out for research purposes on the photodegradation and photostability of the photoactive Diethylstilbestrol compound (DES) a synthetic oestrogen sometimes used in the treatment of specific cancers. Both photochemical and photostability studies were carried out in order to contribute …
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A Study on Photodegradation and The Fate of Pyrogenic Carbon
… contributions of abiotic processes such as photodegradation. The purpose of this study was to assess photodegradation of <em>py</em>DOC and quantify its byproducts (specifically, CO<sub>2</sub> evolved). The study consisted of a complimentary mix of laboratory-scale and controlled …
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The Photodegradation of Diazepam and its Human Metabolites in Water
… temazepam and oxazepam were selected for photodegradation studies. The photodegradability of each drug in distilled and natural waters was evaluated using a Suntest CPS Xenon arc lamp, selected to reproduce the spectral distribution of solar irradiation, with emphasis on the determination …
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Iron-Doped Titanium Dioxide Nanomaterials: Synthesis, Characterization and Photodegradation Catalytic Behavior
… dyes on the surface of the TiO2. Finally, The photodegradation of methylene blue has been studied to quantify the photocatalytic activity of all prepared iron-doped TiO2 and pure TiO2 photocatalysts under simulated sunlight. The measurements are performed at two pH values and the different …
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Photodegradation of peptides and proteins by near UV and visible light
Therapeutic proteins (TP) have been on the rise for the last 30 years for the treatment of diverse diseases, including cancer and autoimmune diseases. Monoclonal antibodies (mAbs) comprise about 50% of the TP approved by the FDA and are the major group of TP sold worldwide. Although the high …
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Photodegradation of biopolymer doped with titanium dioxide (TiO2) as ultraviolet (UV) stabilizer
… analysis of UV-Vis and FTIR confirmed the photodegradation processes of BP and BPC of VOP and WOP. The increasing absorbance in UV-Vis spectra indicated the formation of quinone after UV-irradiation of BP and BPC of VOP and WOP. Furthermore, BP thin films shows rapid loss of tensile …
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Photodegradation of biopolymer doped with titanium dioxide (TiO2) as ultraviolet (UV) stabilizer
… analysis of UV-Vis and FTIR confirmed the photodegradation processes of BP and BPC of VOP and WOP. The increasing absorbance in UV-Vis spectra indicated the formation of quinone after UV-irradiation of BP and BPC of VOP and WOP. Furthermore, BP thin films shows rapid loss of tensile …
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Mechanisms of Microbial Formation and Photodegradation of Methylmercury in the Aquatic Environment
… microbial mercury methylation and methylmercury photodegradation. The role of mercury speciation (influenced by environmental conditions) in determining the reactivity of mercury in these biological and photochemical reactions was the focus of this research.</p><p>Methylmercury production in the …
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Bringing photodegradation of plastic waste into the “green age” through off-grid sustainable energy
… found in category 7 of the resin code. While photodegradation of these polymers has seen significant findings over the years, it remains economically costly, and limited to the laboratory scale. This project introduces the preliminary findings of our own implementations of potential “greener” …
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Unresolved complex mixtures of aromatic hydrocarbons in the marine environment : toxicity, solubility and photodegradation studies
… assessment of toxicity, aqueous solubility and photodegradation behaviour. A previously established link between the reduced Scope for Growth (SFG) of mussels with the concentration of 2-3 ringed aromatic hydrocarbons in mussels from petroleum impacted sites was found also to correlate well with …
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Enhancement in Degradation of Environmental Pollutants: Fenton Degradation of 2,4,6-Trinitrotoluene and Photodegradation of Deepwater Horizon Crude Oil
… of these molecules often requires initial photodegradation. We have investigated the photochemical transformation of oil films with and without photocatalysts present. To better understand the photochemical transformations that occur to the Deepwater Horizon oil, we have conducted …
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Harnessing solar energy: vapor phase polymerized poly(3,4-Ethylenedioxythiophene) for solid state dye-sensitized solar cells and the photodegradation of organic toxicants
<p>Solar energy is the most abundant energy resource available and can be utilized for a variety of applications such as photovoltaics and promote chemical reactions. Dye-sensitized solar cells (DSSCs) are a class of photovoltaic cells that have been well studied for their low cost and …
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Study Of The Photodegradation And Photostability Of Anti-Cancer Drugs In Different Media Towards The Development Of Both New Actinometers And Liquid Formulations
… SUT’s and unimolecular photoreaction of DBZ’s photodegradations. Also, the Φ-order kinetics is proven to describe them better than the usually used classic thermal reaction orders. In aqueous solution, the drugs were found to undergo thermal and photochemical complex degradations, involving at …
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Mechanistic Studies of the Structure-Photostability Relationship of Organic Conjugated Polymers
… their main drawbacks is their susceptibility to photodegradation. Photodegradation occurs when the material is exposed to light leading to irreversible changes in the materials, most often resulting from photoxidation. These irreversible changes cause loss of mechanical, electronic and …
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An evaluation of the environmental fate of reactive dyes
… through anaerobic and aerobic biodegradation and photodegradation. The research herein describes the use of LC-MS analysis with laboratory simulations to develop a better understanding of the occurrence and fate of reactive dyes and their degradation products in the aquatic environment. One reason …
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Decomposition of grasses in a South African savanna
… decided to investigate the processes of photodegradation and microbial decomposition, as well as carryover and also how these processes differ between mesic and semi-arid grasslands. Since previous studies suggest that tallgrass prairies experience more carryover and slower decomposition …
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