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Dissertations / Theses on the topic 'Photocatalytic Nanoparticles'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Termtanun, Mutsee. "Photocatalytic degradation of pesticides using TiO2 nanoparticles." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13827/.

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The problem of water pollution has been an environmental concern for many years. Numerous researchers are looking for an effective method to solve this issue. Heterogeneous photocatalysis, using a semiconductor as a catalyst, is a promising method for the destruction of water polluting pesticides. This method has been called the Advanced Oxidation Process (AOP) which is one of the techniques for water treatment. Titanium dioxide (TiO2) is the most widely accepted photocatalyst because it is non-toxic, stable to photocorrosion, low cost and can potentially work using sunlight rather than artifi

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2

Schmidt, Mark. "Thermochemical treatment of TiO₂ nanoparticles for photocatalytic applications." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002295.

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3

Schmidt, Mark. "Thermochemical Treatment of TiO2 Nanoparticles for Photocatalytic Applications." Scholar Commons, 2007. http://scholarcommons.usf.edu/etd/3428.

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Titanium Dioxide (TiO 2) has been considered an ideal photocatalyst due to factors such as its photocatalytic properties, chemical stability, impact on the environment and cost. However, its application has been primarily limited to ultraviolet (UV) environments due to its high band gap (3.2 eV). This high band gap limits the harvesting of photons to approximately 4% of sunlight radiation. Research today is focused on lowering this gap by doping or coupling TiO 2 with other semiconductors, transition metals and non-metal anions, thereby expanding its effectiveness well into the visible range

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4

Akurati, Kranthi Kumar. "Synthesis of TiO2 based nanoparticles for photocatalytic applications." Göttingen Cuvillier, 2008. http://d-nb.info/991032861/04.

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5

Koch, Susanne Julia. "Dendritic surface modification of photocatalytic nanoparticles for tumour therapy." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0687/document.

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L'apparition d’un développement cancérigène est souvent caractéristique des tumeurs de la région de la tête et du cou. En raison des altérations prémalignes et malignes fréquentes, il n'est souvent pas possible de supprimer complètement la tumeur par chirurgie.Il en résulte un risque élevé de récidive tumorale. Par conséquent, cette recherche de doctorat vise à développer des nanoparticules photocatalytiques (NPs) qui seront utilisées localement en complément de la thérapie tumorale traditionnelle. Ces NPs, une fois absorbées par les cellules tumorales induiront la mort des cellules photocatal

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6

Jones, Wilm Vincent. "Photocatalytic hydrogen production with supported Au and Au-alloy nanoparticles." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/97754/.

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Photocatalytic reforming reactions of simple alcohols and amines have been studied as a method of hydrogen production. The reactions were carried out with synthesised catalysts consisting of noble metal nano-particles (NP) supported on semiconductor supports. The aim was to develop an alternative environmentally friendly approach to hydrogen production. Primarily catalysts were synthesised by the sol immobilisation method, which allows for the formation of a colloidal dispersion of noble metals in solution which can then be deposited onto the surface of an appropriate support. By exploring the

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7

Perera, Jayalath Pathirannehelage Dimuthu Nuwan. "Photocatalytic Properties of Zinc Selenide/Cadmium Sulfide Core-shell Nanoparticles." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1370994697.

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8

Noganta, Siyasanga. "Photocatalytic degradation of organic pollutants using Ag-Fe₃O₄/SiO₂/TiO₂ nanocomposite." Thesis, University of the Western Cape, 2015. http://hdl.handle.net/11394/5208.

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>Magister Scientiae - MSc<br>The global lack of clean water for human sanitation and other purposes has become an emerging dilemma for human beings. The presence of organic pollutants in wastewater produced by textile industries, leather manufacturing and chemical industries is an alarming matter for a safe environment and human health. For the last decades, conventional methods have been applied for the purification of water but due to industrialization these methods fall short. Advanced oxidation processes and their reliable application in degradation of many contaminants have been reported

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Qi, Fei [Verfasser]. "Synthesis of hightemperature stable titania nanoparticles for photocatalytic applications / Fei Qi." Clausthal-Zellerfeld : Universitätsbibliothek Clausthal, 2013. http://d-nb.info/1042456933/34.

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10

Da, Via Luigi. "Photocatalytic oxidation of glucose and cellobiose using TiO2 supported bimetallic nanoparticles." Thesis, University of Liverpool, 2016. http://livrepository.liverpool.ac.uk/2053244/.

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There is a growing interest in developing new photocatalytic routes for biomass upgrade to chemicals and fuels, but despite of some recent progress this remains an area in infancy. The ultimate aim is to convert hemicellulose, cellulose and lignin into valuable platform chemicals using green processes, there is a need to find model compounds to mimic their properties and obtain fundamental understanding of the chemistry. For this reason, cellobiose is used as model compound for cellulose because of its dimer structure, whilst glucose is cheap, easily sourced, and very abundant as the monomeric

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11

Xiao, Qi. "Visible light photocatalytic synthesis of fine organic chemicals with new photocatalysts." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/84078/14/Qi_Xiao_Thesis.pdf.

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This project was a step forward in developing new recyclable photocatalysts for chemical reactions. These new photocatalysts can facilitate reactions by using visible light under moderate reaction conditions which is suitable for a sustainable, green and eco-friendly modern chemical industry. The outcome of the study greatly extended our understanding in metal nanoparticle photocatalysis, which reveals new photocatalytic mechanisms for the controlled transformation of chemical reactions. The prospect of sunlight irradiation driving chemical reactions may provide opportunity for the organic syn

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12

Pradhan, Anindya. "Synthesis and Characterization of Novel Nanoparticles for Use as Photocatalytic Probes and Radiotracers." ScholarWorks@UNO, 2008. http://scholarworks.uno.edu/td/689.

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Two novel synthetic routes to formation of gold-magnetite nanoparticles have been designed. Treatment of preformed magnetite nanoparticles with ultrasound in aqueous media with dissolved tetrachloroauric acid resulted in the formation of gold-magnetite nanocomposite materials. The other route involved irradiation of preformed magnetite nanoparticles by UV light in aqueous media with dissolved tetrachloroauric acid. This method resulted in the formation of gold-magnetite nanocomposite materials. These materials maintained the morphology of the original magnetite particles. The morphology

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13

Nyamukamba, Pardon. "Preparation of photocatalytic TiO₂ nanoparticles immobilized on carbon nanofibres for water purification." Thesis, University of Fort Hare, 2011. http://hdl.handle.net/10353/367.

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Titanium dioxide nanoparticles were prepared using the sol-gel process. The effect of temperature and precursor concentration on particle size was investigated. The optimum conditions were then used to prepare carbon and nitrogen doped titanium dioxide (TiO2) nanoparticles. Doping was done to reduce band gap of the nanoparticles in order to utilize visible light in the photocatalytic degradation of organic compounds. A significant shift of the absorption edge to a longer wavelength (lower energy) from 420 nm to 456 nm and 420 nm to 428 nm was observed for the carbon doped and nitrogen doped Ti

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14

Erdem, Ayça. "Short-term toxicity of photocatalytic titanium dioxide to bacteria under ambient conditions." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 204 p, 2008. http://proquest.umi.com/pqdweb?did=1679680941&sid=14&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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15

El, Hakim Sara. "Photocatalytic and sonocatalytic reactions with Ti@TiO2 nanocatalyst for energy and environment." Thesis, Université de Montpellier (2022-….), 2022. http://www.theses.fr/2022UMONS047.

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Les procédés catalytiques ont été largement étudiés comme une approche prometteuse pour fournir une énergie durable et subvenir au besoin eau potable. Parmi ceux-ci, les procédés photocatalytiques et sonocatalytiques ont été adaptés comme des méthodes efficaces pour atteindre ces deux objectifs. Le facteur clé de ces procédés est l'utilisation de matériaux actifs capables d'éliminer les molécules nocives des eaux usées et de transformer les autres constituants en produits à haute valeur ajoutée. Les matériaux considérés pour les procédés photocatalytiques doivent être actifs sous l'effet de la

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16

Ahmed, Iftikhar. "Synthesis and application of porphyrin-POM hybrids for photocatalytic water remediation and solar energy production." Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112070.

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Ø<br>The dissertation is presented on 252 content pages which has been framed in five chapters and two annexures while the title page opens into a list of abbreviations followed by a foreword on the work. The core theme of the research work is to validate the extended photocatalytic properties of porphyrin-POM materials in evolving from UV to visible light range of solar spectrum. Which describing additional modes for synthesis of hybrid materials (i) electrostatic multilayer’s comprising of Dawson , sandwich Dawson type and preyssler,s POM in combination with free base tetracationic porphyrin

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17

James, Derak J. "Synthesis and photocatalytic activity of the MoS₂ and WS₂ nanoparticles in degradation of organic compounds." Muncie, Ind. : Ball State University, 2009. http://cardinalscholar.bsu.edu/653.

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18

Teoh, Wey Yang Chemical Sciences &amp Engineering Faculty of Engineering UNSW. "Flame spray synthesis of catalyst nanoparticles for photocatalytic mineralisation of organics and Fischer-Tropsch synthesis." Awarded by:University of New South Wales. School of Chemical Sciences and Engineering, 2007. http://handle.unsw.edu.au/1959.4/28259.

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In this thesis, a range of TiO2-based photocatalysts and cobalt-based Fischer-Tropsch (FT) catalysts were developed and synthesised via the one-step Flame Spray Pyrolysis(FSP). The work starts with the demonstration of bare TiO2 nanoparticles synthesis with controlled characteristics such as specific surface areas, crystallite sizes and anatase content. A comparative study was carried out by benchmarking with commercial Degussa P25 TiO2. The FSP TiO2 was shown to be more efficient in mineralising pollutants requiring direct charge transfer such as the saccharides, while P25 was better for mine

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19

Ibrahim, Sara. "Synthesis of Bismuth-Based Thin Films and Nanoparticles by Reactive Magnetron Sputtering for Photocatalytic Applications." Thesis, Université Clermont Auvergne‎ (2017-2020), 2020. http://www.theses.fr/2020CLFAC033.

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La photocatalyse est apparue comme un procédé peu coûteux et respectueux de l’environnement pour la dégradation des colorants polluants, la réduction photocatalytique du CO2, et la dissociation de l’eau. L’objectif principal de ce travail est de synthétiser de nouveaux photocatalyseurs à hétérojonction de haute activité et stabilité par le procédé de pulvérisation cathodique magnétron en condition réactive. Pour cela, nous avons choisi des matériaux à base de bismuth, qui sont récemment apparus comme de nouveaux candidats prometteurs pour les photocatalyseurs sensibles aux rayonnements UV et à

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James, Derak J. "Synthesis and photocatalytic activity of the MoS2 and WS2 nanoparticles in degradation of organic compounds." CardinalScholar 1.0, 2009. http://liblink.bsu.edu/uhtbin/catkey/1503981.

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Nanoparticles of MoS2 and WS2 were synthesized by decomposing the appropriate metal hexacarbonyl in the presence of sulfur dissolved in decalin at 140°C. A significant fraction of the nanoparticles was ≤ 15 nm in diameter as verified by Transmission Electron Microscopy. The process was repeated in the presence of silica and then titania to produce supported metal sulfides. The unsupported nanoparticles were found to exhibit a size-dependent shift in their threshold UV-visible absorption due to quantum confinement. Photocatalytic properties of each sulfide from synthesis in decalin were explore

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21

Mazzi, Alberto. "Modeling and production of metal nanoparticles through laser ablation and applications to photocatalytic water oxidation." Doctoral thesis, Università degli studi di Trento, 2017. https://hdl.handle.net/11572/368523.

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The contents of the present thesis can be divided into three parts. The first three chapters introduce the general context in which this work was developed: the social impact, the motivations and the key concepts of our research field. In particular, in Chapter 1 we discuss about the energy issue, focusing on the problem of sustainability of the energy sources. Through an analysis of updated energy and population statistics, we come to the conclusion that solar energy is the most environmentally, economically and socially sustainable energy source. Then, in Chapter 2 we present the basics of p

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22

Mazzi, Alberto. "Modeling and production of metal nanoparticles through laser ablation and applications to photocatalytic water oxidation." Doctoral thesis, University of Trento, 2017. http://eprints-phd.biblio.unitn.it/1944/1/PhD_thesis_Alberto_Mazzi.pdf.

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The contents of the present thesis can be divided into three parts. The first three chapters introduce the general context in which this work was developed: the social impact, the motivations and the key concepts of our research field. In particular, in Chapter 1 we discuss about the energy issue, focusing on the problem of sustainability of the energy sources. Through an analysis of updated energy and population statistics, we come to the conclusion that solar energy is the most environmentally, economically and socially sustainable energy source. Then, in Chapter 2 we present the basics of p

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23

NEHA. "PHOTOCATALYTIC DEGRADATIO OF ORGANIC DYE BY SILVER NANOPARTICLE FROM AKCALYPHA WILKESIANA VIA GREEN ROUTE." Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18480.

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Silver nanoparticle (AgNP) was synthesized using a medicinal plant Acalypha wilkesiana leaf extract through bottom-up approach. synthesis of nanoparticle via green route is simple, easy to handle and inexpensive in comparison of physical and chemical methods. Phytochemical screening of Acalypha wilkesiana determines the presence of coumarins, flavonoids, sterol, tannin, phenol and saponin. Synthesis of nanoparticle were detected at regular intervals with proper characterization technique majorly include UV-Vis spectroscopy. Further characterization involves the Scanning Electron Microsco

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24

Motay, Marvin. "Multifunctional photocatalytic substrates and textiles constructed via Layer-by-Layer self-assembly of Ag and TiO2 nanoparticles." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAF030/document.

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Des films multicouches à base de nanoparticules de TiO2 et d’Ag ont été construits sur des substrats modèles et des textiles via la technique du Layer-by-Layer (LbL). Les films à base de nanoparticules de TiO2 construits sur substrats modèles ont montré un comportement photocatalytique non conventionnel pour la minéralisation de l’acide formique en phase gaz sous irradiation UV-A, et une minéralisation très importante a été obtenue avec un film possédant une unique couche de nanoparticule de TiO2. Ces films ont également montré des propriétés biocides sous irradiation UV-A. La mise en œuvre d’

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Ocwelwang, Atsile Rosy. "Photocatalytic activity and antibacterial properties of Ag/N-doped TiO2 nanoparticles on PVAE-CS nanofibre support." Thesis, University of Fort Hare, 2012. http://hdl.handle.net/10353/d1006794.

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Lack of potable water is one of the major challenges that the world faces currently and the effects of this are mainly experienced by people in developing countries. This has therefore propelled research in advanced oxidation technologies AOTs to improve the current water treatment methods using cost effective, non toxic and efficient treatment methods. Hence, in this study the sol-gel synthesis method was used to prepare TiO2 nanoparticles that were photocatalytically active under UV and visible solar light as well as possessing antibacterial properties. Silver and nitrogen doping was carried

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Buzby, Scott Edward. "The effect of doping titanium dioxide nanoparticles on phase transformation, photocatalytic activity and anti-bacterial properties." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 120 p, 2008. http://proquest.umi.com/pqdweb?did=1459918071&sid=9&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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27

Thill, Alisson Steffli. "Tuning the electronic and structural properties of cerium oxide nanoparticles for the H2 production photocatalytic reaction." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/185814.

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The photocatalytic water splitting reaction showed to be a promising process to obtain renewable and clean energy, but the efficiency reached in this process is still low and must be improved to be viable. Considering this, the research on improving the efficiency of photocatalysts has attracted a strong interest in the past last years. Cerium oxide (CeO2−, 0 < x < 0.5) is a material recently investigated as a possible photocatalyst to obtain H2 from H2O. In this work, cerium oxide nanoparticles with high surface area (104 < S < 201 m2/g), high pore volume (32 < V < 132 mm3/g) values, wide ran

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Zhou, Xuemei [Verfasser], and Patrik [Gutachter] Schmuki. "Noble-Metal-Free Photocatalytic H2 Evolution from Defect-Engineered TiO2 Nanoparticles/Nanotubes / Xuemei Zhou ; Gutachter: Patrik Schmuki." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2018. http://d-nb.info/1159771189/34.

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29

DePuccio, Daniel P. "Investigating The Influence Of Gold Nanoparticles On The Photocatalytic And Catalytic Reactivity Of Porous Tungsten Oxide Microparticles." ScholarWorks @ UVM, 2016. http://scholarworks.uvm.edu/graddis/641.

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Tungsten oxide (WO3) is a semiconducting transition metal oxide with interesting electronic, structural, and chemical properties that have been exploited in applications including catalysis, gas sensing, electrochromic displays, and solar energy conversion. Nanocrystalline WO3 can absorb visible light to catalyze heterogeneous photooxidation reactions. Also, the acidity of the WO3 surface makes this oxide a good thermal catalyst in the dehydration of alcohols to various industrially relevant chemicals. This dissertation explores the photocatalytic and thermal catalytic reactivity of nanocrysta

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30

Tarasov, Alexander [Verfasser], and Christof [Akademischer Betreuer] Schulz. "Spray-flame synthesis of BaTiO3 nanoparticles for photocatalytic and energy storage applications / Alexander Tarasov ; Betreuer: Christof Schulz." Duisburg, 2020. http://d-nb.info/1214180116/34.

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31

Rosset, Aurelie. "Synthèse et caractérisation de nanoparticules catalytiques pour une application en photocatalyse solaire." Thesis, Perpignan, 2017. http://www.theses.fr/2017PERP0014/document.

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Cette thèse s’inscrit dans le développement et l’optimisation d’un panel de catalyseurs dopés ou non dopés pour le traitement des eaux usées par un Procédé d’Oxydation Avancée (POA), la photocatalyse hétérogène solaire. Ce procédé de traitement tertiaire pour la dépollution de molécules organiques biorécalcitrantes est limité par l’absorption des catalyseurs dans le domaine de l’UV ne représentant que 5 % du spectre solaire reçu à la surface de la Terre. L’objectif de ce travail est de comparer les efficacités photocatalytiques sous rayonnement UV, visible et solaire dans le but d’améliorer le

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32

Spadavecchia, F. "TUNABLE FEATURES OF TIO2 NANOPARTICLES FOR PHOTOCATALYTIC AND PHOTOVOLTAIC APPLICATIONS: A FUNDAMENTAL STUDY OF ELECTRONIC AND STRUCTURAL ASPECTS." Doctoral thesis, Università degli Studi di Milano, 2013. http://hdl.handle.net/2434/215539.

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Nanosized titanium dioxide has been widely explored as both pristine and doped semiconductor. TiO2 nanocrystals were successfully synthesized by three different procedures. Two of them are based on a controlled sol–gel reaction, implemented either by doping or by a hydrothermal growth step with the use of surfactants, exploiting three-dimensional micelles. The latter one is a microemulsion-mediate route, to accurately control the growth of Ti precursor in nanoreactors by the conﬁnement in aqueous droplets. As for the doping, both metal and non-metal elements have been chosen, namely praseodym

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Angel, Luis. "Integration of UV light, activated carbon and photocatalytic nanomaterial technologies for point-of-use water treatment in rural areas in Colombia : performance assessment." Electronic Thesis or Diss., Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2024. http://www.theses.fr/2024IMTA0451.

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La Colombie fait face à des disparités socioéconomiques importantes, l'accès à l'eau potable restant un défi, en particulier dans les zones rurales. Cette recherche explore la faisabilité d'intégrer trois technologies avancées pour conceptualiser un système de traitement de l'eau durable au point d'utilisation pour les communautés rurales. La première technologie est le charbon actif (AC), produit de manière durable et optimale à partir de noyaux de chontaduro en utilisant une activation physique directe à la vapeur d'eau. Le charbon actif a montré une capacité d'adsorption remarquable pour l'

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Hamadanian, Khozani M., A. Reisi-Vanani, P. Razi, and S. Hoseinifard. "Study of Photocatalytic Behavior of Photochemical Doped TiO2 Nanoparticles with In-V Synthesized by Sol-Gel and Hydrothermal Methods." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35281.

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Indium- vanadium doped with different molar percent (0.05-1%) was prepared by photochemical reduction method on pure TiO2 nanoparticles synthesized by sol –gel and hydrothermal process. XRD, FT-IR, TEM, SEM and EDX analysis were done for characterized nanoparticles and methyl orange (MO) was used as an environmental pollutant to verify photocatalytic effect of synthesized particles under visible and UV lamps. Result of tests was showed that In-V doping restrain from crystal growth, that only hydrothermal TiO2 particles with binary doped 0.2% molar of In-V can improve photocatalytic activi

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Dozzi, M. V. "IMPROVING THE PHOTOCATALYTIC ACTIVITY OF TIO2 FOR ENVIRONMENTAL APPLICATIONS: EFFECTS OF DOPING AND OF SURFACE MODIFICATION." Doctoral thesis, Università degli Studi di Milano, 2012. http://hdl.handle.net/2434/167910.

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Different routes were explored for the solution of the two limiting aspects of TiO2 use in photocatalytic processes, i.e. its large band gap, allowing the exploitation of only a small portion of sunlight, and the fast recombination of photoproduced electron-hole pairs. The attention was first focused on the consequences of noble metal nanoparticles deposition on TiO2, with a systematic study on the photocatalytic performance of commercial TiO2 bearing gold nanoparticles deposited either by so-called deposition-precipitation, with particular attention to the method, either thermal or chemical,

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Kwiatkowski, Maciej. "ZnO(core)/TiO2(shell) composites : influence of TiO2 microstructure, N-doping and decoration with Au nanoparticles on photocatalytic and photoelectrochemical activity." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCK046/document.

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Le but de la thèse est d'étudier l'influence de la microstructure des composites ZnO/TiO2 sur leurs propriétés dans la dégradation photocatalytique des polluants organiques et dans l'oxydation de l'eau photoassistée. Pour réaliser cette étude, nous avons choisi la conception basée sur des nano bâtonnets ZnO supportés sur une électrode de verre recouverte d'ITO (Indium Tin Oxide). Les nano bâtonnets de ZnO ont ensuite été recouverts d'une couche de TiO2 dans différentes conditions. La composition et la microstructure des composites ZnO(cœur)/TiO2(coquille) ont été modifiées dans le but d'élucid

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Kwiatkowski, Maciej. "ZnO(core)/TiO2(shell) composites: influence of TiO2 microstructure, N-doping and decoration with Au nanoparticles on photocatalytic and photoelectrochemical activity." Doctoral thesis, Bourgogne Franche-Comté, 2017. https://depotuw.ceon.pl/handle/item/2244.

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Efficient use of renewable energies is one of the most difficult technological challenges facing humanity. Among all renewable energy sources, the sunlight is considered as the most abundant and accessible one. To convert it into usable and controllable form, the modern technology relies on generation of electron-hole pairs in semiconductors upon light absorption. The obtained separated charge carriers possess extra energy brought by the converted sunlight which can be further utilized in various ways. Currently, the most common approach consists in its direct transformation into electricity i

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Caux, Marine. "Metal-loaded graphitic carbon nitride for photocatalytic hydrogen production and the development of an innovative photo-thermal reactor." Thesis, University of St Andrews, 2018. http://hdl.handle.net/10023/15873.

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The path towards mitigation of anthropogenic greenhouse gas emissions lies in the transition from conventional to sustainable energy resources. The Hydrogen Economy, a cyclic economy based on hydrogen as a fuel, is suggested as a tool in the necessary energy transition. Photocatalysis makes use of sunlight to promote thermodynamically non-favoured reactions such as water splitting, allowing for sustainable hydrogen production. Harvesting thermal energy along with photonic energy is an interesting concept to decrease the activation energy of water splitting (i.e. ΔG = + 237.2 kJ∙mol−1). This wo

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Rashid, Mohammad Mamunur. "The Investigation of Photocatalytic and Adsorptive Properties of Humic Acid Grafted Magnetite Nanoparticles for the Remediation of Arsenic, Selenium and Phosphorous from Water." FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3745.

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The crisis of freshwater has been a big concern worldwide. Water contamination that occurs through the discharge of toxic pollutants from different natural and anthropogenic sources have worsened the situation. Adsorption has emerged as a simple and economical water treatment procedure although the challenge is to find the right adsorbent that can efficiently remove the target contaminant followed by their easy recovery from the reaction vessel. In this dissertation, I have focused on the synthesis, characterizations and applications of environmentally compatible and magnetic humic acid coated

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Wade, Jeremy. "An Investigation of TiO₂-ZnFe₂O₄ Nanocomposites for Visible Light Photocatalysis." Scholar Commons, 2005. https://scholarcommons.usf.edu/etd/898.

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Environmental pollution on a global scale is expected to be the greatest problem that chemical scientists will face in the 21st century, and an increasing number of these scientists are looking to new photocatalytic systems for the solution. Existing photocatalytic systems are effective for the decomposition of many unwanted organics through the use of efficient semiconductor photocatalysts activated by ultra-violet (UV) irradiation. The demand for visible light activated photocatalytic systems is increasing rapidly. Currently, however, the efficiency and availability of photocatalysts which c

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Havia, J. (Johanna). "Trace element analysis of humus-rich natural water samples:method development for UV-LED assisted photocatalytic sample preparation and hydride generation ICP-MS analysis." Doctoral thesis, Oulun yliopisto, 2017. http://urn.fi/urn:isbn:9789526216812.

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Abstract Humus-rich natural water samples, containing high concentrations of dissolved organic carbon (DOC), are challenging for certain analytical methods used in trace element analysis, including hydride generation methods and electrochemical methods. In order to obtain reliable results, the samples must to be pretreated to release analytes from humic acid complexes prior to the determination. In this study, methods for both pretreatment and analysis steps were developed. Arsenic is a toxic element and therefore its determination even at low concentration levels is important in environmental

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Bai, Xiaofei. "Effet de taille et du dopage sur la structure, les transitions et les propriétés optiques de particules du multiferroïque BiFeO₃ pour des applications photocatalytiques." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC013/document.

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Ce travail de thèse expérimentale a été consacré à la synthèse par des méthodes de chimie par voie humide de nanoparticules à base du multiferroïque BiFeO3 et à leur caractérisation, avec comme objectif finale des applications photocatalytiques. Ce matériau présente une bande interdite, avec un gap de 2.6eV, qui permet la photo-génération de porteurs de charges dans le visible faisant ainsi de BiFeO3 un système intéressant pour des processus photo-induits. Ce travail s’est en particulier focalisé à caractériser les propriétés de nanoparticules à base de BiFeO3 en vue de comprendre l’effet de s

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Yuan, Xiaojiao. "Nanostructures based on conjugated polymer polypyrrole for application in photocatalysis Photocatalytic degradation of organic pollutant with polypyrrole nanostructures under UV and visible light Polypyrrole nanostructures modified with mono- and bimetallic nanoparticles for photocatalytic H2 generation Highly active composite TiO2-polypyrrole nanostructures for water and air depollution under visible light irradiation Highly Promoted Photocatalytic Hydrogen Generation by Multiple Electron Transfer Pathways Visible light-driven simultaneous water oxidationand quinone reduction by a nano-structuredconjugated polymer without co-catalysts." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASF011.

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Récemment, les nanostructures de polymères conjuguées π (CPN) ont émergé comme une nouvelle classe de catalyseurs pour diverses applications photocatalytiques comme le fractionnement de (ou photosplitting) de l’eau, la réduction du CO2, le traitement de l’eau (dégradation des polluants organiques et réduction de métaux lourds). Parmi la famille des polymères conjugués, le polypyrrole (PPy) a été le plus étudié en raison de sa stabilité environnementale, de sa synthèse facile, de son excellente stabilité. Dans cette thèse, les nanostructures PPy ont été synthétisées par différentes méthodes : p

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Elhage, Ayda. "Palladium-based Catalyst for Heterogeneous Photocatalysis." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39388.

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Over the past decade, heterogeneous photocatalysis have gained lots of interest and attention among the organic chemistry community due to its applicability as an alternative to its homogeneous counterpart. Heterogeneous catalysis offers the advantages of easy separation and reusability of the catalyst. Several studies showed that under optimized conditions, efficient and highly selective catalytic systems could be developed using supported metal/metal oxide nanoparticles. In this dissertation, we summarize the progress in the development of supported palladium nanoparticles for different type

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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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Fournier, Kelsey. "Revalorization of the Antimicrobial Activity of Nanostructure-Based Materials with an Emphasis on TiO₂." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42101.

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The exploration in the use of nanomaterials for a multitude of different applications has grown within the last few years. This is largely due to the vast number of features exhibited by nanoscale materials when compared to their bulk counterparts. The use of nanomaterials in environmental applications can come in different facets, such as, the production of clean energy in solar cells and the application of nanotechnologies in coatings for building exterior surfaces. The first section of the thesis focuses on the use of nanomaterials for water remediation, since purified groundwater is still

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Bhave, Radhika. "Synthesis and photocatalysis study of brookite phase titanium dioxide nanoparticles." Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1181250716/.

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Wang, Fan. "Visible light photocatalysis with supported metal nanoparticles for organic synthesis." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/103567/1/Fan_Wang_Thesis.pdf.

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This project was a step forward in developing new effective photocatalysts for fine organic synthesis under visible light irradiation. These kind of new photocatalysts are able to facilitate reaction rates by using visible light under moderate reaction conditions through a green, economical and environmentally friendly pathway. This thesis investigated the catalyst synthesis, characterization and the application in organic reactions with high activity and selectivity. The discovery of these new metal nanoparticle photocatalysts may inspire further studies on other efficient photocatalysts and

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KUSHWAHA, PREETI. "SYNTHESIS OF ZnO AND ITS PHOTOCATALYTIC ACTIVITY." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14897.

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In the present work, mesoporous ZnO are successfully prepared with the help of hydrothermal method and sol gel method. Zinc nitrate hexahydrate, ctab, urea are used as precursor materials. The ZnO powder obtained is calcined at 800 0C and analyzed different properties and behavior of nanoparticles. The method which is used ,has been implicated with some modification with the aim to reduce the size of nanoparticles followed by the paper, and changes are studied with the help of different experimental characterization as XRD conferred ZnO, SEM and TEM revealed different morphology, shape a

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Sulaimani, Shahad. "Photocatalytic hydrogen evolution by using organic semiconductors nanoparticles." Thesis, 2019. http://hdl.handle.net/10754/660421.

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Abstract: With the worldwide dependence on non-renewable fossil fuels and increasing concerns over their impact on our planet through greenhouse gas emissions finding an alternative source of clean energy is a global imperative. The solar energy is one source of renewable energy resources, and It has the highest potential to contribute substantially to the future of carbon-free power needs. Solar to hydrogen has attracted much attention in the past decade due to its abundance and the spotlessness of hydrogen as fuel for energy usage. However, practically the requirements to convert sol

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