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Dissertations / Theses on the topic 'Titania photocatalyst'

Author: Grafiati

Published: 11 December 2022

Last updated: 31 July 2025

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1

Daniel, Lisa Maree. "Laponite-supported titania photocatalysts." Thesis, Queensland University of Technology, 2007. https://eprints.qut.edu.au/16669/3/Lisa_Daniel_Thesis.pdf.

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This thesis describes the synthesis and characterisation of titania photocatalysts for incorporation into a polyethylene film. Monodisperse, anatase-phase titania nanoparticles are prepared and the synthesis conditions necessary for attraction to a laponite clay support are determined. Methods of preventing agglomeration of the laponite system such as the use of a polyethylene oxide surfactant or chemical modification of the laponite plate edges with a dimethyloctyl methoxysilane are also explored. Finally, photocatalytic studies on the laponite-supported titania nanoparticles are performed,

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2

Daniel, Lisa Maree. "Laponite-supported titania photocatalysts." Queensland University of Technology, 2007. http://eprints.qut.edu.au/16669/.

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This thesis describes the synthesis and characterisation of titania photocatalysts for incorporation into a polyethylene film. Monodisperse, anatase-phase titania nanoparticles are prepared and the synthesis conditions necessary for attraction to a laponite clay support are determined. Methods of preventing agglomeration of the laponite system such as the use of a polyethylene oxide surfactant or chemical modification of the laponite plate edges with a dimethyloctyl methoxysilane are also explored. Finally, photocatalytic studies on the laponite-supported titania nanoparticles are performed,

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3

Marszewski, Michal. "Development of highly porous crystalline titania photocatalysts." Kent State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=kent1476281107453411.

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4

Li, Haitao. "Synthesis of Titanium Dioxide Photocatalyst with the Aid of Supercritical Fluids." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4912.

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Titanium Dioxide (TiO2) emerged as one of the most popular photocatalysts since 1970's. However, its photocatalytic activity requires UV irradiation due to its large band gap unless further functionalization or modifications are performed. Furthermore, recovery issue has always been a major drawback, if the more effective form nano particles are utilized. The key objectives of this research were synthesizing new TiO2 based photocatalyst systems that are effective with both the UV and the visible light while utilizing novel superior environmentally friendly techniques enabling development of na

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5

Nagle, Dylan John. "Infrared spectroscopic investigation of the effects of titania photocatalyst on the degradation of linear low density polyethylene film for commercial applications." Thesis, Queensland University of Technology, 2009. https://eprints.qut.edu.au/32077/1/Dylan_Nagle_Thesis.pdf.

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There is a need in industry for a commodity polyethylene film with controllable degradation properties that will degrade in an environmentally neutral way, for applications such as shopping bags and packaging film. Additives such as starch have been shown to accelerate the degradation of plastic films, however control of degradation is required so that the film will retain its mechanical properties during storage and use, and then degrade when no longer required. By the addition of a photocatalyst it is hoped that polymer film will breakdown with exposure to sunlight. Furthermore, it is desire

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6

Song, Duck-Hyun. "Studies of synthesis and photocatalytic properties of TiO[2] films with various morphologies." Kyoto University, 2014. http://hdl.handle.net/2433/192212.

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7

Pickering, Jon W. "Applications of Optical Properties from Nanomaterials for Enhanced Activity of a Titania Photocatalyst under Solar Radiation." Scholar Commons, 2015. https://scholarcommons.usf.edu/etd/5760.

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In recent years, employing advanced oxidation processes (AOPs) as a means of wastewater remediation has emerged as a promising route towards maintaining a sustainable global water management program. The heterogeneous photocatalytic oxidation process has been of particular interest due to the prospective of utilizing solar radiation as the driving force behind the degradation of pollutants. Of the photocatalyst studied to date, TiO2 remains the most attractive material for environmental applications due to its affordability, stability, biocompatibility and high quantum yield. A key draw back h

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8

Ridder, Bradley J. "Optimization of a Ball-Milled Photocatalyst for Wastewater Treatment Through Use of an Orthogonal-Array Experimental Design." Scholar Commons, 2010. https://scholarcommons.usf.edu/etd/1750.

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The effects of various catalyst synthesis parameters on the photocatalytic degradation kinetics of aqueous methyl orange dye are presented. The four factors investigated were: i) InVO4 concentration, ii) nickel concentration, iii) InVO4 calcination temperature, and iv) ballmilling time. Three levels were used for each factor. Due to the large number of possible experiments in a full factorial experiment, an orthogonal-array experimental design was used. UV-vis spectrophotometry was used to measure the dye concentration. The results show that nickel concentration was a significant parameter, wi

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9

Ozaki, Hirotaka. "Effect of Si and Other Elements Modification on the Photocatalytic Activities of Titanias Prepared by the Glycothermal Method." 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/57274.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(工学)<br>甲第13834号<br>工博第2938号<br>新制||工||1434(附属図書館)<br>26050<br>UT51-2008-C750<br>京都大学大学院工学研究科物質エネルギー化学専攻<br>(主査)教授井上正志, 教授江口浩一, 教授田中庸裕<br>学位規則第4条第1項該当

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10

Hamal, Dambar B. "Design and development of a new generation of UV-visible-light-driven nanosized codoped titanium dioxide photocatalysts and biocides/sporocides, and environmental applications." Diss., Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/2203.

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11

Trofimovaite, Rima. "Nanostructured promoted titania photocatalysts." Thesis, Aston University, 2018. http://publications.aston.ac.uk/37498/.

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Concern over the economics of accessing fossil fuel and widespread acceptance of the anthropogenic origin of rising CO2 emissions and associated climate change is driving academic and commercial research into new routes to sustainable fuels, to meet the demands of a rapidly rising global population and reduce an impact on the environment. The titania oxide semiconductor has attracted a great interest as a photocatalyst for wide-ranging applications including wastewater depollution, solar fuels via both H2 production and CO2 reduction. Tailoring the physicochemical properties of titania photoca

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12

Chen, Lin. "Removal of cyanotoxins by cyclodextrin complex, titanium dioxide photocatalysis and C₆₀ photocataly." FIU Digital Commons, 2010. http://digitalcommons.fiu.edu/etd/2136.

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The presence of cyanotoxins in surface and drinking water is a serious threat to the environment and human health. The most dangerous and widespread cyanotoxins include the microcystin and nodularin families (hepatotoxin), domoic acid (neurotoxin), and cylindrospermopsin (CYN) (hepatotoxin). The primary goal of these studies is to investigate several innovative technologies for the removal and remediation of selected cyanotoxins. The first involves application of cyclodextrins (CDs) as a host to encapsulate cyanotoxins, microcystin, nodularin and domoic acid. Proton NMR was employed for real-t

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13

Liu, Erming. "Synthesis of one-dimensional nanocomposites based on alumina nanofibres and their catalytic applications." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/48323/1/Erming_Liu_Thesis.pdf.

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Materials with one-dimensional (1D) nanostructure are important for catalysis. They are the preferred building blocks for catalytic nanoarchitecture, and can be used to fabricate designer catalysts. In this thesis, one such material, alumina nanofibre, was used as a precursor to prepare a range of nanocomposite catalysts. Utilising the specific properties of alumina nanofibres, a novel approach was developed to prepare macro-mesoporous nanocomposites, which consist of a stacked, fibrous nanocomposite with a core-shell structure. Two kinds of fibrous ZrO2/Al2O3 and TiO2/Al2O3 nanocomposites wer

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14

Pichavant, Alexandre. "Coprécipitation d'oxydes mixtes de titane et d'étain en solution aqueuse." Thesis, Paris, ENMP, 2015. http://www.theses.fr/2015ENMP0075/document.

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La synthèse de particules d'oxydes mixtes en solution aqueuse est souvent difficile à contrôler en raison de la réactivité potentiellement différente des espèces qui coprécipitent. L’objectif de la thèse est de tenter de comprendre et piloter la synthèse dans le cas du système de particules d’oxydes mixtes de titane et d'étain, choisi en raison de l'existence d'une solution solide sur toute la gamme de composition et de la possibilité de recourir à une précipitation homogène plus simple à modéliser que le mélange réactif. Les synthèses sont réalisées par thermohydrolyse avec chauffage micro-on

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15

Bouhadoun, Sarah. "Synthèse de nanoparticules de dioxyde de titane par pyrolyse laser et leur application en photocatalyse." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS003/document.

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Le dioxyde de titane suscite un grand intérêt dans le domaine de la photocatalyse. Cependant, il n'utilise que la composante UV du flux solaire soit 4-5 % de l'énergie disponible. Un objectif de cette thèse est d'élaborer un matériau capable d'absorber dans le visible tout en restant actif sous lumière UV. Des nanoparticules de dioxyde de titane modifiées avec de l'or et/ou de l'azote ont été synthétisées par pyrolyse laser. Les poudres obtenues ont été caractérisées systématiquement par différentes techniques physico-chimiques (analyse ICP-AES), structurales (DRX), morphologiques et texturale

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16

Locke, Ashley. "Morphological investigations of supported titania photocatalysts." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/38904/1/Ashley_Locke_Thesis.pdf.

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Due in no small part to an increasing need to augment existing water purification strategies, the synthesis of titania photocatalysts has been under considerable examination. However, in order to make the use of titania photocatalysts commercially viable there needs to be an increase in the efficiency of the catalysts while decreasing the potential toxicity. Due to its high porosity and novel optical properties, inverse opal titania derived from colloidal crystal templating offers one of the most efficient solutions. While a number of synthesis methods for inverse opal titania have been presen

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17

Pichavant, Alexandre. "Coprécipitation d'oxydes mixtes de titane et d'étain en solution aqueuse." Electronic Thesis or Diss., Paris, ENMP, 2015. http://www.theses.fr/2015ENMP0075.

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La synthèse de particules d'oxydes mixtes en solution aqueuse est souvent difficile à contrôler en raison de la réactivité potentiellement différente des espèces qui coprécipitent. L’objectif de la thèse est de tenter de comprendre et piloter la synthèse dans le cas du système de particules d’oxydes mixtes de titane et d'étain, choisi en raison de l'existence d'une solution solide sur toute la gamme de composition et de la possibilité de recourir à une précipitation homogène plus simple à modéliser que le mélange réactif. Les synthèses sont réalisées par thermohydrolyse avec chauffage micro-on

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18

Rico, Santacruz Marisa. "Band gap control in hybrid titania photocatalysts." Doctoral thesis, Universidad de Alicante, 2014. http://hdl.handle.net/10045/42201.

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19

Hathway, Timothy Lee. "Titanium dioxide photocatalysis studies of the degradation of organic molecules and characterization of photocatalysts using mechanistic organic chemistry /." [Ames, Iowa : Iowa State University], 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3369929.

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20

Lee, Soo-Keun. "Laser photocatalysts." Thesis, Robert Gordon University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.344019.

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21

Hamandi, Marwa. "Élaboration et caractérisation d’oxydes de Titane de Morphologie Contrôlée : application à la Photodégradation de Polluants Organiques." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1077/document.

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Ce travail se résume en deux objectifs principaux. Le premier concerne l'élaboration de matériaux nanohybrides de dioxyde de titane (sous forme sphérique ou tubulaire) décoré par des allotropes de carbone (fullerène fonctionnalisé ou graphène). Le deuxième objectif consiste à l'évaluation de ces différents nanomatériaux dans la photodégradation de l'acide formique (AF) sous irradiation UV. Un effet bénéfique des allotropes de carbone sur l'activité photocatalytique des nanohybrides a été observé suite à l'augmentation de la durée de vie des paires électron-trou photogénérées. Dans un premier t

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22

Gazal, Yoan. "Etude de la croissance de couches minces de TiO2 et TiO2 / SiO2 par torche plasma micro-ondes à la pression atmosphérique." Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0088/document.

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Un dispositif de dépôt chimique en phase vapeur à l’air libre, utilisant une torche à injection axiale (TIA), a été développé pour l’élaboration de couches minces de TiO2 et TiO2/SiO2. Les effets des paramètres de dépôt comme la distance torche-substrat (d), la puissance micro-onde incidente et le débit de précurseur de titane (TTIP) sur (i) la morphologie et (ii) la structure cristalline des couches ont été étudiés. Dans la mesure où ces couches sont appliquées dans le domaine de la photocatalyse hétérogène, l’optimisation du procédé vise dans un premier temps à permettre l’obtention d’une gr

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23

Semlali, Sanaa. "Films mesoporeux photocatalytiques de tio2 non dope et dope par differents metaux : elaboration, caracterisation et etude des proprietes photocatalytiques." Thesis, Pau, 2013. http://www.theses.fr/2013PAUU3041/document.

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L’objet de cette thèse est le développement et l’étude de la photoréactivité de TiO2, absorbant dans le visible et ayant des propriétés autonettoyantes et de dépollution de l’eau et de l‘air. Dans ce contexte, des films d’épaisseur controlée et mésostructurés de TiO2 non dopés et dopés par différents métaux (platine, vanadium et tungstène) , ont été synthétisés par voie sol-gel combinée au procédé d'auto-assemblage induit par évaporation. Les propriétés structurales et optiques ainsi que la composition chimique de la surface des films ont été caractérisées par de nombreuses techniques de carac

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24

Naboulsi, Issam. "Synthèse et caractérisation d’oxyde de titane et de zirconium mésoporeux : applications en catalyse." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0147/document.

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Dans ce travail, nous nous sommes tout d’abord intéressés à l’influence du traitement de la mésophase hybride sous ammoniac et des conditions de cristallisation sur les propriétés d’oxydes de titane mésoporeux. Le protocole de synthèse de ces matériaux a été mis au point auparavant au laboratoire à l’aide d’une méthode combinant le mécanisme transcriptif à partir des cristaux liquides du copolymère bloc P123 et la méthode EISA. Une cristallisation sous atmosphère oxydante, augmente le degré de cristallinité et favorise une croissance des particules d’anatase. En conséquence, la photodégradatio

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Grant, Neil. "Application of titania photocatalysis for organic synthesis." Thesis, University of Aberdeen, 2012. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=185854.

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The addition of benzyltrimethylsilane to maleic anhydride mediated by TiO2 photocatalysis was initially investigated. The affect of changing the catalyst, the radical trap loading and the substitution of the benzyltrimethylsilane molecule was assessed. Cyclisation precursors based on benzyltrimethylsilane were prepared, but were found not to cyclise via TiO2 photocatalysis. A number of other systems were assessed for their ability to cyclise under TiO2 photocatalysis; tertiary amines, aminomethyltrimethylsilanes, phenoxymethyltrimethylsilanes and phenoxyacetic acids. Phenoxymethyltrimethylsila

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26

Pyrgiotakis, Georgios. "Titania carbon nanotube composites for enhanced photocatalysis." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0013482.

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27

Chehadi, Zeinab. "Nanostructures hybrides Au/Semi-conducteur : investigation des effets plasmoniques en catalyse sous lumière visible." Thesis, Troyes, 2017. http://www.theses.fr/2017TROY0016/document.

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Grâce à ses propriétés optiques originales, une NanoParticule d’Or (NPO) excitée peut se comporter comme une nano-source de lumière, de chaleur et d’électrons chauds. Ces propriétés plasmoniques remarquables sont exploitées dans de nombreuses transformations chimiques. Dans ce contexte, la photocatalyse plasmonique basée sur le transfert d’électrons entre une NPO et un semi-conducteur a été proposée. Cependant, peu d’études sont centrées sur l’influence du plasmon et la contribution respective de ses effets locaux (thermiques et électroniques) sur ce transfert utilisé en photocatalyse. Ici, no

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28

Zibin, Hai. "Modification of Titania with Gold-Copper Bimetallic Nanoparticles and Preparation of Copper-Based Photocatalysts : Application in Water Treatment." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00926757.

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Photocatalysis is recently extensively studied because it implies a variety of potential industrial applications ranging from the hydrogen generation of water splitting to the treatment of waste water. Among all the semiconductors, TiO2 has attracted the most attention. But the rate of the electron-hole recombinations is very important and TiO2 is active only under UV light. Various methods are developed to enhance the photoactivity of TiO2. Other semiconductors like copper oxides and copper sulfides also attracted attention due to their lower band-gaps which allow applications in solar photoc

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Szczepankiewicz, Steven Henry Hoffmann Michael R. "Surface chemistry of titanium dioxide photocatalysts /." Diss., Pasadena, Calif. : California Institute of Technology, 2001. http://resolver.caltech.edu/CaltechETD:etd-05232006-094537.

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ANTOLíN, POZUETA Ana María. "Élimination du nitrate dans l'eau potable par catalyse hétérogène et photocatalyse au moyen de nanocatalyseurs AgPt et PdSn supportés sur oxyde de titane." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2016. http://www.theses.fr/2016ENCM0016/document.

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En Europe, l’utilisation en agriculture de grandes quantités d’engrais chimiques est la principale cause de contamination des eaux. Les concentrations en nitrate dans l’eau deviennent nuisibles pour les personnes lorsqu’elles dépassent certaines limites car elles sont la cause de méthémoglobinémie, de cancers et agissent comme perturbateurs endocriniens. L’hydrogénation catalytique hétérogène des nitrates est la méthode de dénitration la plus connue et la plus efficace due à la grande sélectivité pour les produits non toxiques, azote et eau. La photocatalyse hétérogène a émergé comme une voie

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Lebrun, Delphine Misao. "Photonic crystals and photocatalysis : Study of titania inverse opals." Doctoral thesis, Uppsala universitet, Fasta tillståndets fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-300408.

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Due to an increase of human activity, an increase health risk has emerged from the presence of pollutants in the environment. In the transition to renewable and sustainable life style, treatment of pollutants could support the shifting societies. A motivation behind material research for environmental applications is to maximize the efficiency of the materials to alleviate environmental pollution. In the case of titania, an increase of ultra-violet light absorption is needed to overcome its bandgap to produce reactive radicals, which is the basis for photocatalysis. It has been hypothesized th

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Mole, Jonathan Michael. "Titanium dioxide as a photocatalyst in water purification." Thesis, University of Kent, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309747.

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Wilson, Gregory J. "Photocatalysis with a heterosupramolecular assembly." Thesis, Queensland University of Technology, 2006. https://eprints.qut.edu.au/16290/1/Gregory_Wilson_Thesis.pdf.

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Supramolecular chemistry has asserted itself as a significant multidisciplinary field concerned with molecular effects afforded through non-covalent molecular interactions. The increased interest in the literature towards nanoscale devices, through modulation of molecular function, has seen the renaissance of supramolecular chemistry as function progresses from solution to surface. Heterosupramolecular chemistry follows the architectural principles of supramolecular chemistry and embraces both covalent and non-covalent interactions of condensed phase surfaces and molecular components. A mod

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Wilson, Gregory J. "Photocatalysis with a Heterosupramolecular Assembly." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16290/.

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Supramolecular chemistry has asserted itself as a significant multidisciplinary field concerned with molecular effects afforded through non-covalent molecular interactions. The increased interest in the literature towards nanoscale devices, through modulation of molecular function, has seen the renaissance of supramolecular chemistry as function progresses from solution to surface. Heterosupramolecular chemistry follows the architectural principles of supramolecular chemistry and embraces both covalent and non-covalent interactions of condensed phase surfaces and molecular components. A mod

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BALASUBRAMANIAN, GANESH. "EVALUATING THE EFFECT OF SELECTED PROCESS PARAMETERS ON THE PHOTOCATALYTIC DEGRADATION OF ORGANIC POLLUTANTS." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1012410668.

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Cai, Yanling. "Titanium Dioxide Photocatalysis in Biomaterials Applications." Doctoral thesis, Uppsala universitet, Nanoteknologi och funktionella material, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-160634.

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Despite extensive preventative efforts, the problem of controlling infections associated with biomedical materials persists. Bacteria tend to colonize on biocompatible materials and form biofilms; thus, novel biomaterials with antibacterial properties are of great interest. In this thesis, titanium dioxide (TiO2)-associated photocatalysis under ultraviolet (UV) irradiation was investigated as a strategy for developing bioactivity and antibacterial properties on biomaterials. Although much of the work was specifically directed towards dental materials, the results presented are applicable to a

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DeSouza, Julio Agnelo. "Synthesis and characterisation of nanocrystalline titania spheres : application to photocatalysis." Thesis, University College London (University of London), 2005. http://discovery.ucl.ac.uk/1445409/.

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This thesis describes the making of titania nanocrystalline particles (photonic crystals) and their use as photocatalysts. Chapter 1 describes the work that motivates this research - this includes a description of these structures as propagating a 'slow photon' effect that could make them excellent photocatalysts for decomposing organic compounds. Chapter 2 describes the synthetic procedures that make these photonic crystals. The three-step procedure is detailed involving the infiltration of voids of an opal structure, by either sol-gel or CVD with the characterisation of these structures reve

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Vezzoli, Massimiliano. "Intrinsic kinetics of titania photocatalysis : simplified models for their investigation." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/51574/1/Massimiliano_Vezzoli_Thesis.pdf.

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Even though titanium dioxide photocatalysis has been promoted as a leading green technology for water purification, many issues have hindered its application on a large commercial scale. For the materials scientist the main issues have centred the synthesis of more efficient materials and the investigation of degradation mechanisms; whereas for the engineers the main issues have been the development of appropriate models and the evaluation of intrinsic kinetics parameters that allow the scale up or re-design of efficient large-scale photocatalytic reactors. In order to obtain intrinsic kine

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Fan, Ka Ho. "Synthesis and evaluation of macroporous TiO2 composite photocatalyst /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?CENG%202006%20FAN.

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Akanksha, Tyagi. "Development of novel hybrid catalysis for carbon-carbon couplings by titanium oxide photocatalyst and metal cocatalyst." Kyoto University, 2018. http://hdl.handle.net/2433/232379.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(人間・環境学)<br>甲第21178号<br>人博第850号<br>新制||人||203(附属図書館)<br>29||人博||850(吉田南総合図書館)<br>京都大学大学院人間・環境学研究科相関環境学専攻<br>(主査)教授吉田寿雄, 教授内本喜晴, 教授田部勢津久<br>学位規則第4条第1項該当

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Amsaaed, Salem. "Copper Grafted Titanium Dioxide in Hydrogels for Photocatalysts." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 2018. http://digitalcommons.auctr.edu/cauetds/155.

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This study are based on the premise that the incorporation of metal ions into nano titania-PHEMA [poly (2-hydroxyethyl methacrylate)] hydrogels would enhance the desirable properties in the photodecomposition of pollutants. The investigation are centered in the use of Cu(II) as metal ion of interest. The development of TiO2-PHEMA-Cu hydrogels was conducted, and the characterization of the materials by FT-IR, XRD and fluorescence was performed. The absorption of copper(II) from the solution was monitored by UV-Vis. The FT-IR are found too, be the most effective tool too, analyze the interaction

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Kashiwaya, Shun. "Science de surface et propriétés chimiques d'hétérostructures NiO/TiO2 monocristallin." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0241/document.

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Les photocatalyseurs à base de TiO2 ont été l’objet d’une grande attention comme une méthode durable de purification de l’air ou de l’eau, et de production d’hydrogène par décomposition de l’eau. Une stratégie avantageuse consiste à développer des héterostructures par couplage avec un autre oxyde métallique former une jonction de type Schottky ou avec un autre oxyde métallique pour créer une jonction p-n à l’interface de manière à prévenir les recombinaisons via une séparation de charge « vectorielle » à ces jonctions. De plus, les facettes cristallines jouent un rôle crucial dans le piégeage

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Ostachavičiūtė, Simona. "WO3, Se-WO3 ir TiO2/WO3 fotokatalizatorių sintezė, struktūra ir aktyvumas." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2015. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20150109_130956-82196.

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Pasaulyje neslopsta susidomėjimas fotokataliziniais procesais, kuriuos siekiama pritaikyti vandens skaidymo į vandenilį ir deguonį, organinių ar neorganinių junginių nukenksminimo technologijose. Fotoelektrocheminis vandens skaidymas į elementus vertinamas kaip vienas perspektyviausių būdų, galinčių ateityje užtikrinti efektyvų atsinaujinančių energijos šaltinių panaudojimą. Kuriant fotokatalizines sistemas, nanostruktūrinis titano dioksidas (TiO2) išlieka viena tinkamiausių ir labiausiai tyrinėtų medžiagų. Tačiau titano dioksidas neaktyvus regimosios spinduliuotės srityje, todėl alternatyva T

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Hadj, Salah Nadjet. "Etude de la dégradation photocatalytique de polluants organiques en présence de dioxyde de titane, en suspension aqueuse et en lit fixe." Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENA014/document.

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La première partie de ce travail est consacrée à l’évaluation de l’efficacité photocatalytique de plusieurs semiconducteurs commerciaux. La comparaison est basée sur la détermination de leurs propriétés physiques : diamètre des particules, taille des cristallites, structure cristallographique, propriétés électroniques, composition chimique ainsi que capacité d’adsorption. L’efficacité photocatalytique est testée sur le phénol, un polluant modèle. Alors que ZnO présente une activité photocatalytique légèrement supérieure à celle des différents TiO2 étudiés, c’est pour le TiO2 P25 que la plus fa

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Lannoy, Anthony. "Contribution des cyclodextrines au développement de systèmes photocatalytiques à base de TiO2 : applications à la dégradation de polluants organiques dans l'eau." Thesis, Artois, 2014. http://www.theses.fr/2014ARTO0408.

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La photocatalyse hétérogène est une technique d'oxydation avancée prometteuse dans le domaine de la dépollution d’effluents aqueux ou gazeux industriels contenant des composés organiques tels que les colorants, engrais, pesticides ou composés organiques volatils (COV). La photocatalyse met en oeuvre l'excitation d’un matériau semi-conducteur par une radiation lumineuse et dans ce contexte le dioxyde de titane (TiO2) est le photocatalyseur le plus couramment employé. Cependant, son activité est liée à de nombreux paramètres (longueur d'onde d'irradiation, paramètres texturaux, composition crist

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Sotelo-Vazquez, C. "Modification of titania films by chemical vapour deposition for enhanced photocatalysis." Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/1553144/.

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Titanium dioxide (TiO2) is the leading material for self-cleaning applications due to its intrinsic properties, such as chemical inertness, mechanical robustness, high photocatalytic activity and durability to extend photocatalytic cycling. However, its relatively wide bandgap limits its outdoor applications. There has been a strenuous effort to try and improve the photocatalytic efficiency of TiO2, in particular by modifying its electronic structure to enhance its function under solar illumination. The most commonly studied approaches for achieving this have been to incorporate anionic and/or

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Arcadipane, Enrica. "Titania Nanowires: synthesis, characterization and properties." Doctoral thesis, Università di Catania, 2016. http://hdl.handle.net/10761/3741.

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This thesis explored the synthesis of titanium dioxide nanowires by seed assisted thermal growth in the temperature range 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 the full range of explored temperatures (600-1000 °C). According to this observation the Au-Ti phase diagram cannot be taken unto account to depict the VLS mecanism with the help of e

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Beydoun, Donia Chemical Engineering &amp Industrial Chemistry UNSW. "Development of a novel magnetic photocatalyst : preparation, characterisation and implication for organic degradation in aqueous systems." Awarded by:University of New South Wales. Chemical Engineering and Industrial Chemistry, 2000. http://handle.unsw.edu.au/1959.4/20451.

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Magnetic photocatalysts were synthesised by coating a magnetic core with a layer of photoactive titanium dioxide. This magnetic photocatalyst is for use in slurry-type reactors in which the catalyst can be easily recovered by the application of an external magnetic field. The first attempt at producing this magnetic photocatalyst involved the direct deposition of titanium dioxide onto the surface of magnetic iron oxide particles. The photoactivity of these Fe3O4/TiO2 was lower than that of single-phase TiO2 and was found to decrease with an increase in the heat treatment. These observations we

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Montoya, Anthony Tristan. "Synthesis of carbon nitrides and composite photocatalyst materials." Diss., University of Iowa, 2018. https://ir.uiowa.edu/etd/6479.

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This thesis describes the synthesis, characterization and photocatalytic applications of carbon nitride (C3N4) and titanium dioxide (TiO2) materials. C3N4 was prepared from the thermal decomposition of a trichloromelamine (TCM) precursor. Several different reactor designs and decomposition temperatures were used to produce chemically and thermally stable orange powders. These methods included a low temperature glass Schlenk reactor, a high mass scale stainless steel reactor, and decomposition at higher temperatures by the immersion of a Schlenk tube into a furnace. These products share many of

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Coleman, Heather Margaret. "Photocatalysis of oestrogens in water." Thesis, University of Ulster, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342532.

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