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Showing 1 to 15 of 15 for “"Photocatalytic oxidation"”.
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Photocatalytic oxidation of pharmaceutical micropollutants in a flow-through reactor
… a model flow-through reactor to study dynamic photocatalytic treatment processes. Light is supplied by black light bulbs, which emit light in the ultraviolet-A range. Experiments have shown this to be an effective method for degradation of these four drug compounds as they flow through the …
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The photo-oxidation of benzyl alcohol over TiO2 and Pt TiO2 and the effect of reaction conditions
… benzaldehyde is commonly produced by the oxidation of benzyl alcohol (B-Alc) using stoichiometric amounts of hazardous oxidants such as chromates. The selective, photocatalytic oxidation of benzyl alcohol offers a promising, more environmentally friendly method of producing benzaldehyde. …
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An investigation of the reaction kinetics of photocatalytic wastewater treatment using suspended titanium dioxide catalyst
… sunlight to trigger the water treatment process. Photocatalytic oxidation, as this form of advanced oxidation process (AOP) is known, is characterized by the generation of hydroxyl radicals - one of the most oxidizing agents known in environmental chemistry - which easily attack all types of …
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Ultraviolet-C Powered Air Purifying Respirator (UVC PAPR)
… (UVA) activated titanium dioxide (TiO2) photocatalytic oxidation (PCO) chamber. This work encompasses the overall design of the system, safety considerations, and testing to quantify its pathogen inactivation efficacy and to characterize system performance.
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Photocatalytic applications in organic synthesis.
… it is capable of a wide range of reactions, from oxidation to cyclisation. This study examined some of the factors and influences involved in the applications of the technique for the oxidation of alcohols to ketones. For the photocatalysis the steroid 6β-hydroxy-3α,5-cyclo-5α-androstan-17-one …
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UV- TiO2 photocatalytic degradation of the x-ray contrast agent diatrizoate: kinetics and mechanisms in oxic and anoxic solutions
… processes. This study examines the aqueous photocatalytic treatment of diatrizoate using nanophase titanium dioxide (TiO2). Experiments demonstrate that diatrizoate is degraded in aqueous TiO2 suspensions illuminated with ultraviolet-A (UVA) light under both oxic and anoxic conditions. Both …
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The photocatalytic degradation of phenolic compounds
… to influence the reaction rate and also primary oxidation steps, and hence the intermediate profile. 2,6- Dialkylated phenols reacted fastest and showed high conversion to dehydrodimeric products as a prelude to degradation. In contrast, 3,5-dialkylated phenols and 4-<i>tert</i>-butylphenol …
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Development of a Novel TiO2-polymeric Photocatalyst for Water Purification both under UV and Solar illuminations
… water purification processes, made advanced oxidation processes come into existence. Among all kind of advanced oxidation processes, photocatalytic oxidation is the most promising one. The photocatalytic process is based on aqueous phase hydroxyl radical chemistry and couples low energy UV …
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Selective Oxidations by Metalloporphyrins and Metallocorroles
… as well as in many useful metal-catalyzed oxidations. Many transition metal catalysts are designed for biomimetic studies of the predominant oxidation catalysts in Nature, the cytochrome P450 enzymes. In this work, a series of metalloporphyrin and metallocorrole complexes have been …
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Enhanced Mineralization of Phenol and other Hydroxylated Compounds in a Photocatalytic Process assisted with Ferric Ions
… spread problem of contaminated wastestreams. Photocatalytic reactions take place at a slow rate nonetheless. Efforts have focused on the improvement of photocatalytic reactors design and on the enhancement of the photocatalyst activity through various doping techniques. There have been some …
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Biologically inspired materials for electro-responsive coatings and the photo-oxidation of water
… the way nature employs peptides, a synthetic photocatalytic system for water oxidation was developed using photosystem II (PSII) as a model. Proteins form the structural scaffold for PSII, assembling dye molecules as well as the metal-oxo catalytic center; furthermore, peptides play an active …
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Rational design of hydrogen-free catalytic active sites
… of corrosive thiols to disulfides and the photocatalytic oxidation of (S')-citronellol. The extreme electronic deficiency imparted on the metal complexes supports a new strategy for broadening catalytic activity to include thiols with poor basicity, which under normal circumstances cannot …
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The destruction of the cyanobacterial toxin microcystin-LR by semiconductor photocatalysis.
… such as coagualtion, filtration and chemical oxidation using chlorine. While activated carbon adsorption and membrane filtration have been shown to physically remove microcystin-LR from water the toxin is not destroyed. Recently the use of photocatalysis was shown to rapidly degrade …
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[Ru-POM] Photo-electrocatalysis
… processes that influence the overall output from photocatalytic thin films were optimized. These steps included; (1) the extent to which the catalyst and sensitizer interact electronically, (2) the film structure since this can influence the substrate access to the catalytic centres and (3) their …
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In-situ photocatalytic remediation of organic contaminants in groundwater
This research is about the development of a photocatalytic reactor design, Honeycomb, for in-situ groundwater remediation. Photocatalysis, typically a pseudo first order advanced oxidation process, is initiated via the illumination of UVA light on the catalyst, i.e. titanium dioxide (TiO2). In the …