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
Tuning the optical and photoelectrochemical properties of surface-modified TiO2.
Radim Beranek,Horst Kisch +1 more
TL;DR: High surface area nanocrystalline TiO(2) was modified by urea pyrolysis products at different temperatures between 300 degrees C and 500 degrees C to show enhanced sub-bandgap absorption (Urbach tail) and exhibit photocurrents in the visible down to 750 nm.
Journal ArticleDOI
Decolorization and aromatic ring degradation kinetics of Direct Red 80 by UV oxidation in the presence of hydrogen peroxide utilizing TiO2 as a photocatalyst
TL;DR: In this article, the effect of variables such as pH and H 2 O 2 concentration on the degradation of Direct Red 80 in a fixed bed photocatalytic reactor was investigated.
Journal ArticleDOI
Solution-phase grafting of titanium dioxide onto the pore surface of mesoporous silicates: Synthesis and structural characterization
TL;DR: Titanium dioxide has been grafted onto the pore surface of MCM-41 and FSM-16 by reacting TiCl4 in hexanes with the as-synthesized mesostructured silicate as mentioned in this paper.
Journal ArticleDOI
Nitrogen complex species and its chemical nature in TiO2 for visible-light sensitized photocatalysis
Ryoji Asahi,Takeshi Morikawa +1 more
TL;DR: In this article, the detailed assignment of N 1s binding energies observed in the XPS measurement was analyzed and detailed analyses of the formation energies showed that introducing the N species more in a controlled way via process conditions is crucial to achieve the optimized photocatalytic performance.
Journal ArticleDOI
Improved photocatalytic activity of Sn4+ doped TiO2 nanoparticulate films prepared by plasma-enhanced chemical vapor deposition
TL;DR: In this article, a nanoparticulate film with a doping ratio of about 7∶100 (Sn)∶(Ti) was prepared by the plasmaenhanced chemical vapor deposition (PCVD) method.
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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Electrochemical Photolysis of Water at a Semiconductor Electrode
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