Journal ArticleDOI
Photocatalysis on TiO2 Surfaces - Principles, Mechanisms, and Selected Results
TLDR
In this article, the authors focus on interfacial processes and summarize some of the operating principles of heterogeneous photocatalysis systems, including the electron transfer and energy transfer processes in photocatalytic reactions.Abstract:
In 1972, Fujishima and Honda discovered the photocatalytic splitting of water on TiO{sub 2} electrodes. This event marked the beginning of a new era in heterogeneous photocatalysis. Since then, research efforts in understanding the fundamental processes and in enhancing the photocatalytic efficiency of TiO{sub 2} have come from extensive research performed by chemists, physicists, and chemical engineers. Such studies are often related to energy renewal and energy storage. In recent years, applications to environmental cleanup have been one of the most active areas in heterogeneous photocatalysis. This is inspired by the potential application of TiO{sub 2}-based photocatalysts for the total destruction of organic compounds in polluted air and wastewaters. There exists a vast body of literature dealing with the electron transfer and energy transfer processes in photocatalytic reactions. A detailed description of these processes is beyond the scope of this review. Here, the authors tend to focus on interfacial processes and to summarize some of the operating principles of heterogeneous photocatalysis. In section 2, the authors first look at the electronic excitation processes in a molecule and in a semiconductor substrate. The electronic interaction between the adsorbate molecule and the catalyst substrate is discussed in terms of the catalyzed ormore » sensitized photoreactions. In section 3, thermal and photocatalytic studies on TiO{sub 2} are summarized with emphasis on the common characteristics and fundamental principles of the TiO{sub 2}-based photocatalysis systems. In section 4, they address the research effort in the electronic modification of the semiconductor catalysts and its effect on the photocatalytic efficiency. Several representative examples will be presented including the Schottky barrier formation and modification at metal-semiconductor interfaces. Some concluding remarks and future research directions will be given in the final section. 160 refs.« lessread more
Citations
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Journal ArticleDOI
Wavelength-sensitive photocatalytic degradation of methyl orange in aqueous suspension over iron(III)-doped TiO2 nanopowders under UV and visible light irradiation.
TL;DR: Well-crystallized iron(III)-doped TiO2 nanopowders with controlled Fe3+ doping concentration and uniform dopant distribution, have been synthesized with plasma oxidative pyrolysis and the photocatalytic reactivity depends not only on the iron doping concentration but also on the wavelength of the irradiating light.
Journal ArticleDOI
Preparation, characterization and photocatalytic activity of nano-sized ZnO/SnO2 coupled photocatalysts
TL;DR: In this paper, the photocatalytic activity of coupled oxides ZnO/SnO 2 in a molar ratio of 2:1 (Z 2 S) and 1: 1 (ZS) was investigated using co-precipitation method and characterized with X-ray diffraction (XRD), UV-VIS diffuse reflectance spectroscopy and specific surface area (Brunauer-Emmett-Teller).
Journal ArticleDOI
BiOBr–carbon nitride heterojunctions: synthesis, enhanced activity and photocatalytic mechanism
TL;DR: In this article, the photocatalytic performance of the 0.5BiOBr-C3N4 heterojunction was evaluated by degrading Rhodamine B in aqueous solution induced by visible or indoor light.
Journal ArticleDOI
Bonding of gold nanoclusters to oxygen vacancies on rutile TiO2(110).
Erik Wahlström,Núria López,Renald Schaub,P. Thostrup,Anders Rønnau,C. Africh,Erik Lægsgaard,Jens K. Nørskov,Flemming Besenbacher +8 more
TL;DR: It is shown both experimentally and theoretically that a single oxygen vacancy can bind 3 Au atoms on average, and a new growth model for the TiO2(110) system involving vacancy-cluster complex diffusion is presented.
Journal ArticleDOI
Introduction: Titanium Dioxide (TiO2) Nanomaterials
Xiaobo Chen,Annabella Selloni +1 more
References
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Book
Principles of Instrumental Analysis
TL;DR: In this article, the authors present an overview of the main components of optical atomic spectrometers and their application in the field of surface characterization by Spectroscopy and Microscopy.
Book
Photocatalysis: Fundamentals and Applications
Ezio Pelizzetti,Nick Serpone +1 more
TL;DR: In this paper, the reader is first introduced to the meaning of photocatalysis and subsequently taken through the essentials of photochemistry towards bridging it to semiconductor materials, followed by thermodynamic and kinetic aspects.
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