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 150 for “"photocatalyst"”.
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Photocatalyst testing and development
This thesis is concerned with the development of more appropriate and sensitive testing 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 …
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Development and testing of thin photocatalyst films
This thesis details the development of surface-exposed nanoparticle (SEN) films made from titanium dioxide (TiO<sub>2</sub>) and cadmium sulfide (CdS) nanoparticles, as well as their characterisation and testing for photocatalytic activity by using a variety of known photocatalytic reactions and …
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Computer-Guided Design of Photocatalyst for PET-RAFT Polymerisation
… polymerisation uses a photo-excited photocatalyst (PC) to reversibly and deactivate the propagating species. Under regulation by light, photo-controlled polymerisation features temporal control, spatial control, sequence control and high level of selectivity/orthogonality between …
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Carbon Nitride as a Heterogeneous Photocatalyst for Organic Transformations
… progress has been mostly confined to homogeneous photocatalysts, especially precious Ir or Ru metal complexes. In this thesis, carbon nitrides have been introduced as an inexpensive, stable, easy-to-synthesise, scalable and non-toxic heterogeneous photocatalyst. Prior to this work, carbon nitrides …
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Boosting Biodetection Signals via Photopolymerization: Strategies for Photocatalyst Amplification
… by coupling molecular recognition events with photocatalyst labels (eosin Y) and amplifying through visible light-initiated free radical polymerization. Leveraging inherent amplification in the radical polymerization, PBA can provide naked-eye detectable signals within 5 min, showing great …
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Epoxy Siloxane Self-Cleaning Coating using F64PcZn/TiO2 Photocatalyst Composite
<p>A new photocatalytic composite powder incorporated into a siloxane epoxy polymer has been shown to yield a highly efficient self-cleaning coating. The composite, which makes greater use of light in the visible/near-infrared (NIR) region, was prepared by coating a nano-particle photocatalytic …
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Copper Oxide Nano Photocatalyst for Wastewater Purification using Visible Light
… and characterization of copper oxide nano photocatalyst for wastewater purification using visible light. The presented copper oxide nano material can serve as a low-cost and green technology for environmental applications. Uniform cubic, octahedral and rhombic dodecahedral Cu2O nano …
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Investigation on Light-driven Photocatalyst-based Materials for Wastewater Cleaning and Environmental Remediation
… wastewater purification techniques based on photocatalyst have received much attention in recent years. However, problems such as low quantum efficiency, limited light responding range and recovery problems limit the further applications of photocatalyst-based materials. In this study, a …
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ARYL-HETEROATOM CROSS-COUPLING WITH DUAL NICKEL/PHOTOCATALYST PROTOCOLS : THEORY, APPLICATIONS AND RECENT DEVELOPMENTS
An overview on utilization of dual nickel/photocatalyst protocols to conduct aryl-heteroatom cross-coupling reactions is presented. Basic concepts of photocatalysis, including different relaxation pathways, the difference of singlet and triplet states, and parameters used to predict reactivity are …
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Development of a Novel TiO2-polymeric Photocatalyst for Water Purification both under UV and Solar illuminations
… energy UV light with semiconductors acting as photocatalyst. The slurry form of TiO2 though being efficient has several disadvantages (particularly, post treatment expensive separation steps) which brings the immobilization of the catalysts on surfaces into existence. In this study, a …
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Preparation, Characterization, and Evaluation of Photocatalytic Properties of a Novel NaNbO3/Bi2WO6 Heterostructure Photocatalyst for Water Treatment
… their photocatalytic performance. Heterogeneous photocatalyst composites, taking advantage of the improved light absorption efficiency as well as the facilitated electron-hole separation at the interface between different semiconductors, have been proven to be a promising strategy. In this study, …
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Performance of polyethylene glycol (PEG) capped zinc oxide nanoparticles as photocatalyst in membrane photocatalytic reactor for industrial dye wastewater treatment
… on the effectiveness of PEG capped on ZnO as photocatalyst in MPR for treating dye wastewater from textile industry in Johor, Malaysia. Three different ZnO were utilized in the present study which are commercial ZnO, zinc oxide in the presence of polyvinylpyrrolidone (ZnO�PVP) and zinc oxide …
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Solar Driven Photoelectrochemical Water Splitting For Hydrogen Generation Using Multiple Bandgap Tandem Of Cigs2 Pv Cells And Thin Film Photocatalyst
The main objective of this research was to develop efficient CuIn1-xGaxS2 (CIGS2)/CdS thin film solar cells for photoelectrochemical (PEC) water splitting to produce very pure hydrogen and oxygen. Efficiencies obtained using CIGS2 have been lower than those achieved using CuInSe2 and CuIn1-xGaxSe2. …
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Control of viruses in drinking water with visible light-activated TiON/PdO photocatalyst: performance dynamics associated with regeneration and activation
… nitrogen-doped titanium oxide (TiON/PdO) photocatalyst against viruses was further characterized. For initial virus concentrations of 108-1011 pfu/ml, TiON/PdO, was able to achieve four-logs of viral surrogate MS2 phage removal, with both dark and photocatalytic effects. Sustained …
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Experimental investigation of a catalyst under various solar light conditions for hydrogen production.
The light absorption characteristics of the photocatalyst {[Ru(bpy)2(dpp)]2RhBr2}5+ and the photochemical Ru(bpy)2(dpp)2+ is investigated. Extinction coefficient versus wavelength is determined for both a low intensity broad spectrum LED light source and one sun intensity simulated sunlight. …
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Photocatalysis in a New Light: A Biohybrid Approach for Improved Reactivity with Tunable, Low-Energy Light Excitation
… crucial steps for the design of highly efficient photocatalysts in the future. Chapter 1 describes the relevant structures in natural photosynthesis as inspiration for synthetic approaches, the different mechanisms of energy transfer, and examples of photocatalytic systems that harness such …
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Tailoring Optical and Plasmon Resonances in Core-Shell and Core-Multishell Nanowires
… and, plasmonic light harvesting in ultrathin photocatalyst layers for water splitting are studied.</p> <p>Utilizing the LSPR in the metal layer and the magnetic dipole resonance in the semiconductor shell under traverse electric (TE) polarization, semiconductor-metal-semiconductor CMS NWs can …
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Development of functionalized materials through sol-gel route for applications in catalysis and surface protection
… The first application concerns the use of a photocatalyst that allows to degrade volatile organic compounds (VOC). The main photocatalyst is TiO2. It has been studied as a powder or as a film deposited on a support. A comparison of these two shapes has shown that an identical photocatalyst …
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