Synthesis, characterization and photocatalytic properties of nanosized Bi{sub 2}WO{sub 6}, PbWO{sub 4} and ZnWO{sub 4} catalysts

Journal Article · Thu Apr 12 04:00:00 EDT 2007 · Materials Research Bulletin

OSTI ID:21000621

Hongbo, Fu ^[1]; Chengsi, Pan ^[1]; Liwu, Zhang ^[1]; Yongfa, Zhu ^[1]

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1. Department of Chemistry, Tsinghua University, Beijing 100084 (China)

Nanosized Bi{sub 2}WO{sub 6}, PbWO{sub 4} and ZnWO{sub 4} photocatalysts were synthesized by a mild hydrothermal crystallization process. The physical and photophysical properties of the catalysts were characterized by X-ray diffractometry, Brunauer-Emmet-Teller surface area and porosity measurements, transmission electron microscopy, Raman spectra, and diffused reflectance spectroscopy. The rhodamine-B photodegradation in aqueous medium was employed as a probe reaction to test the photoactivities of the as-prepared samples under four irradiation wavelengths. Bi{sub 2}WO{sub 6} not only presented the photocatalytic activity in the wide spectral scope, including UV and visible light but also exhibited the strong photosensitized capability to transform RhB under visible light irradiation ({lambda} > 490 nm). ZnWO{sub 4} only displayed relatively high photoactivity under UV irradiation. However, PbWO{sub 4} showed poor photoactivity under any light irradiation. On the basis of the calculated density functional theory (DFT), the photocatalytic mechanisms were discussed.

• OSTI ID: 21000621
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 4 Vol. 42; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CATALYSTS
CHEMICAL PREPARATION
CRYSTALLIZATION
DENSITY FUNCTIONAL METHOD
IRRADIATION
LEAD TUNGSTATES
NANOSTRUCTURES
OXIDES
PHOTOCATALYSIS
POROSITY
RAMAN SPECTRA
RAMAN SPECTROSCOPY
SURFACE AREA
TRANSMISSION ELECTRON MICROSCOPY
VISIBLE RADIATION
X-RAY DIFFRACTION
ZINC TUNGSTATES