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
NIR-Responsive Photocatalytic Activity and Mechanism of NaYF4:Yb,Tm@TiO2 Core–Shell Nanoparticles
TL;DR: In this paper, the authors investigated the energy transfer process between NaYF4:Yb,Tm and TiO2 and the origin of the degradation of organic pollutants under NIR radiation.
Journal ArticleDOI
Production of electricity and hydrogen by photocatalytic degradation of organic wastes in a photoelectrochemical cell: the concept of the Photofuelcell: a review of a re-emerging research field.
TL;DR: The present review aims to give a researcher who has no experience with Photofuelcells all necessary basic knowledge to join the field without much trouble and to give to an experienced researcher a handy manual of reference.
Journal ArticleDOI
Role of Fe doping in tuning the band gap of TiO2 for the photo-oxidation-induced cytotoxicity paradigm.
Saji George,Suman Pokhrel,Zhaoxia Ji,Bryana L. Henderson,Tian Xia,Linjiang Li,Jeffrey I. Zink,Andre E. Nel,Lutz Mädler +8 more
TL;DR: The importance of band gap energy in the phototoxic response of the cell to TiO(2) nanoparticles is demonstrated and the potential of this material to generate adverse effects in humans and the environment during high-intensity light exposure is reflected.
Journal ArticleDOI
Crystal facet-dependent photocatalytic oxidation and reduction reactivity of monoclinic WO3 for solar energy conversion
TL;DR: In this article, a facile and new route of synthesizing a quasi-cubic-like WO3 crystal with a nearly equal percentage of {002, {200} and {020} facets was reported, which is able to photoreduce CO2 to generate CH4 in the presence of H2O vapor.
Journal ArticleDOI
Development of a gas sensor utilizing chemiluminescence on nanosized titanium dioxide.
TL;DR: The results showed that the carbon deposited on the surface of TiO2, decreasing the catalytic activity, but can be removed in air by controlling the temperature at 500 degrees C for 3 h, signify the long lifetime of the gas sensor.
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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