Download or read book Synthesis and Characterization of Titanium and Silicon Mixed oxide Aerogel Photocatalysts written by Scott Jebron Kersey and published by . This book was released on 2000 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and characterization of modified silica zirconia mixed oxide catalysts written by Daniel J. Rosenberg and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Binary Titania silica Mixed Oxides written by Sridhar Budhi and published by . This book was released on 2010 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Catalytic Properties of Titanium Containing Silica Aerogel written by Soon Chai Lee and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Transition Metal Doped Titania Silica Aerogels as Photocatalysts written by Yin Yin Tan and published by . This book was released on 2008 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Sol Gel Handbook written by David Levy and published by John Wiley & Sons. This book was released on 2015-08-28 with total page 1616 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive three-volume handbook brings together a review of the current state together with the latest developments in sol-gel technology to put forward new ideas. The first volume, dedicated to synthesis and shaping, gives an in-depth overview of the wet-chemical processes that constitute the core of the sol-gel method and presents the various pathways for the successful synthesis of inorganic and hybrid organic-inorganic materials, bio- and bio-inspired materials, powders, particles and fibers as well as sol-gel derived thin films, coatings and surfaces. The second volume deals with the mechanical, optical, electrical and magnetic properties of sol-gel derived materials and the methods for their characterization such as diffraction methods and nuclear magnetic resonance, infrared and Raman spectroscopies. The third volume concentrates on the various applications in the fields of membrane science, catalysis, energy research, biomaterials science, biomedicine, photonics and electronics.
Download or read book Synthesis and Characterization of Titanium Dioxide Nanomaterials for Photocatalytic Hydrogen Production written by Tarek Abdel-Samad Abdel-Rahman Kandiel and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Titanium Dioxide written by Magdalena Janus and published by BoD – Books on Demand. This book was released on 2017-07-26 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium dioxide is mainly used as a pigment and photocatalyst. It is possible to find it in food, cosmetics, building materials, electric devices, and others. This book contains chapters about characteristics of anatase and rutile crystallographic structure of titanium dioxide and the use of theoretical calculation for photoactivity determination.
Download or read book Titanium Dioxide Photocatalysis written by Vladimiro Dal Santo and published by MDPI. This book was released on 2019-05-27 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although the seminal work of Fujishima et al. dates back to 1971, TiO2 still remains the most diffused and studied semiconductor, employed in photo-oxidation processes for cleantech (i.e., polluted water and air treatment), in solar fuel production (mainly hydrogen production by water photo splitting), and in Carbon Capture and Utilization (CCU) processes by CO2 photoreduction. The eleven articles, among them three reviews, in this book cover recent results and research trends of various aspects of titanium dioxide photocatalysis, with the chief aim of improving the final efficiency of TiO2-based materials. Strategies include doping, metal co-catalyst deposition, and the realization of composites with plasmonic materials, other semiconductors, and graphene. Photocatalysts with high efficiency and selectivity can be also obtained by controlling the precise crystal shape (and homogeneous size) and the organization in superstructures from ultrathin films to hierarchical nanostructures. Finally, the theoretical modeling of TiO2 nanoparticles is discussed and highlighted. The range of topics addressed in this book will stimulate the reader’s interest as well as provide a valuable source of information for researchers in academia and industry.
Download or read book Synthesis Characterization and Photocatalytic Properties of Titania Aerogels written by Rhett J. Psota and published by . This book was released on 2008 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Titanium oxide Nanomaterials written by Manoj Ainikalkannath Lazar and published by . This book was released on 2012 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: The side effects of some recent scientific advances challenge the well-being of our planet. Water contamination, one of these side effects, from industrial effluents is a major source of fresh water pollution. Semiconductor photocatalysis, which operates under ultraviolet or visible light irradiation, is a well proven approach to water de-contamination. Among the various available semiconductor photocatalysts, nanocrystalline titanium-oxides are unique in their activity, stability and biocompatibility. Consequently titanium-oxide mediated photocatalytic mineralization of organic pollutants in aqueous solution has become a well established research area.Titanium-oxides are mostly exploited as non-selective photocatalysts in degrading water contaminants, mainly organic compounds. However, selective degradation has the advantage of being able to allow the recovery of valuable desired compounds from waste water while degrading the rest. This thesis is about the synthesis, characterization and selective adsorption and degradation properties of titanium dioxide and potassium titanate nanostructures. A low-temperature sol-gel method followed by a pH controlled precipitation technique was adopted for the synthesis of titanium dioxide photocatalysts with tailored surface charge. Potassium titanate was derived by the alkali (KOH) treatment of titanium dioxide nanoparticles under near-ambient experimental conditions. These nanomaterials were tested for their selective adsorption and photocatalytic properties with a cationic and an anionic dye. The origin of the selective adsorption and photocatalytic ability of the synthesized titanium-oxide samples was found to be due to the synergistic effects of surface charge and crystallinity.
Download or read book Synthesis and Characterization of Doped Aerogels Used in Photoactivated Catalysis written by Michael William Connor and published by . This book was released on 1992 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanotechnology and Photocatalysis for Environmental Applications written by Muhammad Bilal Tahir and published by Elsevier. This book was released on 2020-07-14 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotechnology and Photocatalysis for Environmental Applications focuses on nanostructured control, synthesis methods, activity enhancement strategies, environmental applications, and perspectives of semiconductor-based nanostructures. The book offers future guidelines for designing new semiconductor-based photocatalysts, with low cost and high efficiency, for a range of products aimed at environmental protection. The book covers the fundamentals of nanotechnology, the synthesis of nanotechnology, and the use of metal oxide, metal sulfide, and carbon-based nanomaterials in photocatalysis. The book also discusses the major challenges of using photocatalytic nanomaterials on a broad scale. The book then explores how photocatalytic nanomaterials and nanocomposites are being used for sustainable development applications, including environmental protection, pharmaceuticals, and air purification. The final chapter considers the recent advances in the field and outlines future perspectives on the technology. This is an important reference for materials scientists, chemical engineers, energy scientists, and anyone looking to understand more about the photocatalytic potential of nanomaterials, and their possible environmental applications. Explains why the properties of semiconductor-based nanomaterials make them particularly good for environmental applications Explores how photocatalytic nanomaterials and nanocomposites are being used for sustainable development applications, including environmental protection, pharmaceuticals, and air purification Discusses the major challenges of using photocatalytic nanomaterials on a broad scale
Download or read book Synthesis Characterization and Photocatalytic Activity of Titanium IV Oxide written by Chun Kit Goh and published by . This book was released on 2014 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Synthesis and Characterization of Nanostructured Titanium Dioxide Photocatalysts and Their Performance in Selected Environmental and Industrial Applications written by Catherine L. Bothe Almquist and published by . This book was released on 2001 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although there has been much interest in photocatalysis, there are currently few commercial applications of photocatalysis currently in use because of two developmental challenges: 1) a relatively low quantum efficiency, and 2) the requirement of near ultraviolet light energy (?
Download or read book Titanium Dioxide Nanoparticles written by Yucheng Lan and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past few decades, titanium dioxide has been an important material for different sectors of modern technology. More precisely, this ceramic has been synthesised in the form of nanomaterial and applied in buildings, dye-sensitised solar cells, hydrogen production, sensors, rechargeable batteries, electrocatalysis, self-cleaning, environmental pollution, and antibacterial actions based on its enhanced optical properties. This book describes preparation, photocatalytic properties, and applications of nanostructured titanium dioxide with a particular focus on non-traditional syntheses and brookite. Titanium oxide nanoparticles are produced by hydrothermal processes, ionic liquid-assisted reactions, biological approaches, ball-milling techniques, etc. Physical properties and potential future applications of the produced nanostructured titanium dioxide nanoparticles are reviewed. Toxicity of titanium oxide nanoparticles and titanium oxide nanowires are also discussed.
Download or read book An Investigation Into the Photocatalytic Properties of Microporous Titanosilicate Materials written by Michael Nash and published by ProQuest. This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Photocatalysis is currently an extensively studied research area with a variety of potential commercial/industrial applications ranging from the production of H 2 from water as a clean energy source to the treatment of waste water by solar collector reactors. For all these potential applications semiconductors, particularly TiO 2 and ZnO, have attracted the most attention due to their high reactivity. However these materials are all wide-band gap semiconductors and thus require high energy electromagnetic radiation (UV light) in order to promote photocatalysis. They are also dense nonporous materials with low surface areas. Microporous titanosilicate materials have recently been seen as viable alternatives to these semiconductors since they have large surface areas and their band gaps can be modified for low energy electromagnetic radiation. In this thesis we examine three different microporous titanosilicate materials, TSP, Sitinakite, and ETS-10. We will show that all of these materials have surface areas that are much larger than TiO 2 or ZnO. In addition, these materials will also be shown to have unique photocatalytic properties that are determined by the structure, particularly the connectivity of the titanium octahedra. One disadvantageous photocatalytic property is a higher band gap than TiO 2 and ZnO that results from quantum confinement. These unique photocatalytic properties will also be shown to lead to partial oxidation products for the reaction of model volatile organic compounds (VOCs), methanol and ethylene, with oxygen. Since only partial oxidation is achieved and the band gap energy is higher than that of TiO 2 and ZnO, methods for modifying the photocatalytic properties of these materials will be discussed. The use of transition metals as dopants into the structure of ETS-10 is presented as a method for lowering the band gap energy and achieving visible light photocatalysis. In this thesis we investigate the use of two different transition metals, vanadium and chromium. We show that both metals isomorphously substitute into the ETS-10 structure by replacing titanium and that vanadium is unique since it can completely replace titanium forming an analogous ETS-10 structure known as AM-6. In the case of vanadium we show that the substitution occurs with two different oxidation states, V 4+ and V 5+, which each have different coordination. In chromium the substitution occurs with only one oxidation state, Cr 3+, all with the same coordination. We show that these transition metals lower the band gap energy and add new visible light transitions. This lowering of the band gap is shown to occur by the addition of d orbitals just below the conduction band while some of the visible light transitions are shown to be caused by d-d transitions that arise from V 4+ and Cr 3+ . These new transitions and the lowering of the band gap are shown to give the vanadium-incorporated ETS-10 materials visible light reactivity with the mixed vanadium-titanium samples being shown as the most active. The chromium-incorporated ETS-10 materials are shown to be inactive under visible light. In order to solve the problem of partial oxidation post synthesis methods are discussed which change the photocatalytic properties of these materials to allow complete oxidation. These post synthesis methods usually involve adding defects to the crystal structure by acid treatment so as to expose more of the titanium octahedra. Ammonium ion exchange on ETS-10 and AM-6 is presented as the best post synthesis procedure since it exposes the titanium/vanadium octahedra but does not completely destroy the structure. For both ETS-10 and AM-6 no change in overall crystal structure is observed after ion exchange; however, changes in the local coordination of the titanium/vanadium octahedra are observed. There is also a red shift in the band gap energy of ETS-10 and no change in the band gap of AM-6. No further changes in the coordination of the titanium octahedra or overall structure are observed after breakdown of the ammonium ions to ammonia and the proton form of ETS-10 (H-ETS-10) upon heating. In AM-6 however, the vanadium octahedra change from an octahedral coordination to a tetrahedral coordination upon breakdown of the ammonium ions, which results in changes to the intensity of several of the X-ray diffraction peaks for the dehydrated sample. These changes in local coordination of the titanium/vanadium octahedra upon breakdown of the ammonium ions are shown to achieve complete oxidation of methanol and ethylene in oxygen. Finally this thesis discusses the viability and general aspects of these photocatalytic microporous titanosilicate materials and the methods used to modify them. Future recommendations are also given on ways to improve the synthesis and modification methods of these microporous materials.
