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Electrochemical Aspects of Photocatalysis: Application to Detoxification and Disinfection Scenarios

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K. Rajeshwar and J. G. Ibanez

Department of Chemistry and Biochemistry, Box 19065, University of Texas at Arlington, Arlington, TX 76019-0065

J. Chem. Educ., 1995, 72 (11), p 1044

DOI: 10.1021/ed072p1044

Publication Date: November 1995

Abstract

Here electrochemical concepts are used to provide a unified discussion on semiconductor photocatalysis. The behavior of irradiated TiO2 particles is analyzed in terms of the chemical role of electrons and holes at the photocatalyst particle/medium interface, the influence of experimental variables, and the dynamics of conjugate chemical reactions undergone by the photogenerated electron-hole pairs. These ideas have relevance to the use of irradiated TiO2 for the treatment of environmental pollutants.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Environmental Chemistry

Keywords (Subject):

Electrochemistry

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This article has been cited by 10 ACS Journal articles (5 most recent appear below).

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  Some simple chemistry is used to demonstrate how Fe(II) ions, formed during iron corrosion in acid aqueous solution, can reduce toxic Cr(VI) species, forming soluble Cr(III) and Fe(III) ions. These ions, in turn, can be precipitated by neutralizing the ...
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Solar Energy Conversion and Environmental Remediation Using Inorganic Semiconductor–Liquid Interfaces: The Road Traveled and the Way Forward
Krishnan Rajeshwar
The Journal of Physical Chemistry Letters2011 Article ASAP
- Solar Energy Conversion and Environmental Remediation Using Inorganic Semiconductor–Liquid Interfaces: The Road Traveled and the Way Forward
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  Unlike their solid-state counterparts, semiconductor–liquid junctions are versatile in that the incident solar energy can be stored in the form of chemical fuels. Another attractive application is the use of irradiated oxide semiconductor-coated surfaces ...
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
Laboratory Experiments on the Electrochemical Remediation of the Environment. Part 8. Microscale Simultaneous Photocatalysis
Jorge G. Ibanez , Rodrigo Mena-Brito and Arturo Fregoso-Infante
Journal of Chemical Education2005 82 (10), 1549
- Laboratory Experiments on the Electrochemical Remediation of the Environment. Part 8. Microscale Simultaneous Photocatalysis
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  Journal of Chemical Education2005 82 (10), 1549
  In this article we describe a microscale experiment in which the simultaneous oxidation of an organic compound (citric acid) and the reduction of a metal ion (Cu2+) are photocatalytically performed in an aqueous slurry containing TiO2 irradiated with UV ...
  Abstract | Hi-Res PDF | PDF w/ Links
Selenium-Modified Titanium Dioxide Photochemical Diode/Electrolyte Junctions: Photocatalytic and Electrochemical Preparation, Characterization, and Model Simulations
Norma R. de Tacconi, C. R. Chenthamarakshan, and Krishnan Rajeshwar, Eugenio J. Tacconi
The Journal of Physical Chemistry B2005 109 (24), 11953-11960
- Selenium-Modified Titanium Dioxide Photochemical Diode/Electrolyte Junctions: Photocatalytic and Electrochemical Preparation, Characterization, and Model Simulations
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  The photoelectrochemical behavior of TiO2 thin film electrodes, photocatalytically modified with Se islands, is described. The TiO2 thin films were electrodeposited on transparent conducting oxide glass substrates. The resultant electrode forms a n-TiO2/p-...
  Abstract | Full Text HTML | Hi-Res PDF
Photoassisted Deposition of Chalcogenide Semiconductors on the Titanium Dioxide Surface: Mechanistic and Other Aspects
Sashikala Somasundaram, C. R. Chenthamarakshan, Norma R. de Tacconi, Yong Ming, and Krishnan Rajeshwar
Chemistry of Materials2004 16 (20), 3846-3852
- Photoassisted Deposition of Chalcogenide Semiconductors on the Titanium Dioxide Surface: Mechanistic and Other Aspects
  Sashikala Somasundaram, C. R. Chenthamarakshan, Norma R. de Tacconi, Yong Ming, and Krishnan Rajeshwar
  Chemistry of Materials2004 16 (20), 3846-3852
  Ultraviolet irradiation of TiO2 can be used to photocatalytically prepare Se/TiO2 and MSe/TiO2 (M = Cd, Pb) composite semiconductor samples. These samples show bipolar photovoltammetry profiles.
  Abstract | Full Text HTML | Hi-Res PDF