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Coupled Semiconductor Systems for Photocatalysis. Preparation and Characterization of Polycrystalline Mixed WO3/WS2 Powders
- Source :
- The Journal of Physical Chemistry B. 103:8236-8244
- Publication Year :
- 1999
- Publisher :
- American Chemical Society (ACS), 1999.
-
Abstract
- Mixed WO3/WS2 powders were prepared by oxidation of WS2. The physical properties of the samples were characterized by X-ray diffraction, diffuse reflectance spectroscopy, and scanning electron microscopy; they were strongly dependent upon the time and temperature of oxidation. The chemical state and the elemental distribution of the sample surface were investigated by X-ray photoelectron spectroscopy. The photocatalytic results have showed that the aqueous suspensions of the mixed WO3/WS2 systems have significantly higher activities than pure WS2 and WO3 for the photodegradation of phenol. The enhanced performance can be related to the presence of heterojunctions WO3/WS2 on the single particles. The best results were obtained when the surface WS2 molar fraction was about 0.5.
- Subjects :
- Diffuse reflectance infrared fourier transform
Scanning electron microscope
Chemistry
Inorganic chemistry
Mole fraction
Surfaces, Coatings and Films
Chemical state
X-ray photoelectron spectroscopy
Chemical engineering
Materials Chemistry
Photocatalysis
Crystallite
Physical and Theoretical Chemistry
Photodegradation
Subjects
Details
- ISSN :
- 15205207 and 15206106
- Volume :
- 103
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry B
- Accession number :
- edsair.doi...........20fde54974cf466dbcdbfab9c963fdaf