Abstract
TiO2 powders with various surface hydroxyl densities have been prepared by thermal treatment (600–1000 °C), and their activity for photocatalytic oxygen evolution in aqueous suspensions has been investigated in the presence of various electron acceptors, i.e. AgNO3, K2PtCl4 and KBrO3. The activity increased drastically with the thermal treatment. The oxygen evolution rate was found to be inversely proportional to the surface concentration of OH–, indicating an inhibitory effect of surface hydroxyl groups with respect to photocatalytic oxygen evolution. On highly hydroxylated samples the formation of surface bound peroxides appears to be favoured over oxygen generation.
Keywords
PhotocatalysisOxygenAqueous solutionChemistryOxygen evolutionPhotochemistryHydroxyl radicalThermal treatmentInorganic chemistryThermalRadicalOrganic chemistryCatalysisMaterials sciencePhysical chemistryElectrochemistry
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Publication Info
- Year
- 1988
- Type
- article
- Volume
- 84
- Issue
- 1
- Pages
- 197-197
- Citations
- 90
- Access
- Closed
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Yoshinao Oosawa,
Michaël Grätzel
(1988).
Effect of surface hydroxyl density on photocatalytic oxygen generation in aqueous TiO2 suspensions.
Journal of the Chemical Society Faraday Transactions 1 Physical Chemistry in Condensed Phases
, 84
(1)
, 197-197.
https://doi.org/10.1039/f19888400197
Identifiers
- DOI
- 10.1039/f19888400197