Retarding effect of surface hydroxylation on titanium(IV) oxide photocatalyst in the degradation of phenol
- Indian Inst. of Science, Bangalore (India)
Heterogeneous photocatalytic mineralization of organic pollutants on semiconductor particles is a promising method for wastewater treatment. Nanosized powders of TiO[sub 2] (anatase) were prepared by the hydrothermal method, acid-medium hydrolysis or by vacuum freeze-drying of sols, and annealing at temperatures < 700 C. Photocatalytic activities of these powders in the mineralization of phenol, were evaluated in comparison to that of Degussa P25. Kinetic data indicated that surface hydroxylation had a retarding effect on the degradation of phenol. Formation of stable peroxotitanium species were observed on hydroxylated powders, whereas only V[sub Ti]-O[sup [minus]] hole trap centers were detected by EPR on the heat treated samples. The data supports direct hole oxidation of the substrate preadsorbed on the photocatalyst, which is otherwise blocked by surface hydroxyls.
- OSTI ID:
- 6569992
- Journal Information:
- Materials Research Bulletin; (United States), Journal Name: Materials Research Bulletin; (United States) Vol. 30:2; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
320305* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
54 ENVIRONMENTAL SCIENCES
540220 -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
AROMATICS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
DECOMPOSITION
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
HYDROXYL RADICALS
LIQUID WASTES
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHENOL
PHENOLS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADICALS
SURFACE PROPERTIES
SYNTHESIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
WASTE WATER
WASTES
WATER
WATER TREATMENT