Heterogeneous photocatalysis
- Univ. of Texas, Austin, TX (United States). Dept. of Chemistry and Biochemistry
Heterogeneously dispersed semiconductor surfaces provide both a fixed environment to influence the chemical reactivity of a wide range of adsorbates and a means to initiate light-induced redox reactivity in these weakly associated molecules. Upon photoexcitation of several semiconductors nonhomogeneously suspended in either aqueous or nonaqueous solutions or in gaseous mixtures, simultaneous oxidation and reduction reactions occur. This conversion often accomplishes either a specific, selective oxidation or a complete oxidative degradation of an organic substrate present. The paper discusses the following: survey of reactivity (functional group transformations and environmental decontamination); mechanism of photocatalysis (photoelectrochemistry, carrier trapping, inhibition of electron hole recombination by oxygen, involvement of the hydroxy radical, adsorption effects, Langmuir-Hinshelwood kinetics, pH effects, temperature effects, and sensitization); and semiconductor pretreatment and dispersion (photocatalytically active semiconductors, photocatalyst preparation, and surface perturbation). 215 refs.
- OSTI ID:
- 6043783
- Journal Information:
- Chemical Reviews; (United States), Vol. 93:1; ISSN 0009-2665
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
SEMICONDUCTOR MATERIALS
PHOTOCHEMICAL REACTIONS
ADSORPTION
CATALYSTS
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
HETEROGENEOUS CATALYSIS
HYDROXYL RADICALS
PH VALUE
REVIEWS
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
CATALYSIS
CHEMICAL REACTIONS
DOCUMENT TYPES
KINETICS
MATERIALS
RADICALS
REACTION KINETICS
SORPTION
SYNTHESIS
400500* - Photochemistry