1. Phase transition of BiVO nanoparticles in molten salt and the enhancement of visible-light photocatalytic activity.
- Author
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Li, Chunguang, Pang, Guangsheng, Sun, Shangmei, and Feng, Shouhua
- Subjects
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BISMUTH compounds , *PHASE transitions , *FUSED salts , *PHOTOCATALYSIS , *NANOPARTICLES , *SOLAR energy , *PARTICLE size distribution , *SURFACE area - Abstract
BiVO nanoparticles are prepared by molten salt method. Tetragonal BiVO completely transforms to monoclinic phase after heating in molten LiNO at 270 °C for 18 h. The average particle sizes of monoclinic BiVO varied from 30 to 52 nm while the initial ratio of BiVO to LiNO changes from 1:6 to 1:24. The photocatalytic activity is evaluated by measuring decolorization of N, N, N′, N′-tetraethylated rhodamine dye solution under visible-light irradiation. Both of the de-ethylation and chromophore cleavage are responsible for the decolorization of RB. The sample with an average particle size of 52 nm and a moderate surface area of 10 m/g exhibit the highest visible-light photocatalytic activity. The shift of Raman peak position indicates that the symmetry distortions in the local structure of the monoclinic BiVO. The variations of the local structure result in the modification of the electronic structure, which is responsible for the high visible-light photocatalytic activity. [ABSTRACT FROM AUTHOR]
- Published
- 2010
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