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Showing 1 to 20 of 75 for “"Photocatalytic activity"”.
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VISIBLE-LIGHT-ACTIVE SEMICONDUCTOR HETEROJUNCTIONS FOR ENHANCED PHOTOCATALYTIC ACTIVITY
… been recently reported on the development of new photocatalytic materials, modification of existing materials to enhance light harvesting, and increasing the number of active sites in order to buttress photocatalytic activity. In a semiconductor photocatalytic system, photo–induced electron-hole …
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Development of titanium dioxide nanoparticles/nanosolution for photocatalytic activity
Biological and chemical contaminants by man-made activities have been serious global issue. Exposure of these contaminants beyond the limits may result in serious environmental and health problem. Therefore, it is important to develop an effective solution that can be easily utilized by mankind. …
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Continuous Analysis of Photocatalytic Activity in Thin-Films and Coatings
<p>Materials that undergo photocatalytic reactions create evolved gases due to ultraviolet light decomposition. Current methods of measuring these gases typically result in destruction of the sample. A test fixture was developed to measure evolved gases in a nondestructive manner through the …
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Band Gap Engineering Of Titania Systems Purposed For Photocatalytic Activity
Ab initio computer aided design drastically increases candidate population for highly specified material discovery and selection. These simulations, carried out through a first-principles computational approach, accurately extrapolate material properties and behavior. Titanium dioxide (tio2) is one …
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Synthesis, characterization, and photocatalytic activity of tantalum oxide thin films
… based on the quantum efficiency. The photoactivity of the films was measured using a recirculating methylene blue solution. Above 15 nm, the film thickness did not have an effect on the methylene blue degradation rate. To test the premise of being limited by electron-hole transport, the …
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Correlation of Photocatalytic Activity with Band Structure of Low-dimensional Semiconductor Nanostructures
Photocatalytic hydrogen generation by water splitting is a promising technique to produce clean and renewable solar fuel. The development of effective semiconductor photocatalysts to obtain efficient photocatalytic activity is the key objective. However, two critical reasons prevent wide …
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Effects of fluorine modifiers and gold colloids in enhancing photocatalytic activity of TiO2 under visible light irradiation
… TiO2 into a better photocatalyst with enhanced photocatalytic activity under visible light irradiation, TiO2 was initially synthesized using peroxotitanic acid (PTA) method using two different solvents of distilled water and Zamzam water. Fluorine was then added into TiO2 to control the crystal …
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Effect of deposition conditions and doping on the structure, optical properties and photocatalytic activity of d.c. magnetron sputtered TiO2 thin films
… relationship between the microstructure and the photocatalytic activity of TiO2 thin films, with respect to the catalytic breakdown of volatile organic compounds. TiO2 thin films were deposited by d.c. magnetron sputtering from sub-stoichiometric, ceramic TiO2 targets. The as deposited films were …
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Visible Light Photocatalytic MoO3-Based Nanomaterials Synthesis, the Effect of Polymer Coatings on Their Photocatalytic Activity and Dissolution, and Their Applications in Water Treatment
… depleted or becoming progressively contaminated. Photocatalytic metal oxide semiconductors such as MoO3 have shown much promise in water decontamination as they can generate reactive oxygen species (ROS) that degrade pollutants. MoO3 is an environmentally friendly, low-cost, visible light …
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Formation Mechanisms and Photocatalytic Properties of ZnO-Based Nanomaterials
… the degradation of malachite green dye in water. Photocatalytic activity is studied as a function of morphology; and, the ZnO nanorods show enhanced photocatalytic activity for the degradation of the dye compared to hexagonal ZnO nanopyramids. After demonstrating the catalytic activity of these …
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Photocatalyst testing and development
… methods to enable the analysis and comparison of photocatalytic ability for photocatalytic materials with a range of activities. A significant part of this thesis is dedicated to the development and examination of the ISO 22197-1:2016 for NO removal (NO ISO) using commercial “self-cleaning” …
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Titania-silica composite materials for self-cleaning applications on monumental stones
… mesoporous TiO2-SiO2 composites that have photocatalytic activity have been synthesized by mixing ethoxysilane oligomers and TiO2 nanoparticles in the presence of a non-ionic surfactant (noctylamine). The products synthesized have a clear practical application on buildings and other …
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Materiali Ceramici per Edilizia con Funzionalità Fotocatalitica
… at the study and application of titanium dioxide photocatalytic activity on ceramic materials. As a matter of fact, photocatalysis is a very promising method to face most of the problems connected with the increasing environmental pollution. Furthermore, titanium dioxide, in its anatase …
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Analysis and Comparison of the Photodecomposition Reaction of Methanol on CeO2 Impregnated TiO2 Surfaces Versus Bare TiO2 Surfaces
… been well-studied primarily due to its unique photocatalytic activity. Different preparation techniques have been developed to increase its photocatalytic activity by various means, including simply increasing the surface area, changing the makeup of the framework, and modifying the surface …
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Development of functionalized materials through sol-gel route for applications in catalysis and surface protection
… - Photocatalysis: Synthesis of material with photocatalytic property or with an additional property - Cyclocarbonation: Synthesis of an immobilized catalyst for polyurethane production through a green process The first application concerns the use of a photocatalyst that allows to degrade …
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An evaluation of some commercially-available thin TiO2 films and TiO2 films grown by atomic layer deposition for potential photocatalytic applications
… TiO2 and Ti1-xO2:Mx films provided varying photocatalytic activities dependent on differing degrees of crystalline morphology, Ti3+ concentrations and dopant used. Nominally undoped TiO2 was mainly amorphous, showing only minimal evidence of polycrystalline anatase structures and contained …
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Synthesis and characterization of nanostructured catalysts for photovoltaic applications
… studying the relationship between morphology and photocatalytic activity. The addition of CNTs to the synthesis showed that they acted as nucleation sites and altered the morphology. Materials were fully characterized using Raman, SEM, XRD, BET, and FTIR. The photocatalytic activity of the …
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Computational study of low index surface of an anatase TiO2 doped with ruthenium (Ru) and strontium (sr) for application in Dye sensitized solar cells
… influence on the visible-light absorption and photocatalytic activity of the doped anatase TiO2 (1 0 0) surface. Furthermore, according to the calculated results, we propose the optical transition mechanisms of Ru and Sr-doped anatase TiO2 (1 0 0) surface. Thus, we conclude that the visible …
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Titania Nanowires: synthesis, characterization and properties.
… between 600-1000 °C. In order to improve the photocatalytic performances of TiO2 NWs, we modified the samples applying two approach: doping by ion implantation of Fe+ and annealing in forming gas. It was found that the formation of pure Ti NWs is not energetically or kinetically favoured in …
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TiO2-supported copper nanoparticles prepared via ion exchange for photocatalytic hydrogen production
… an aqueous solution (10 vol. %) of methanol. Photocatalytic activity displayed by the IE Cu/TiO2 was compared with Cu/TiO2 prepared by wet impregnation (WI) and reasons for the differences in performance were investigated. The particle synthesis approach comprised three key stages: (1) …
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