Microwave assisted synthesis and characterization of pure and Cr doped TiO2 with improved photo-efficiency

This work deals with the effect of chromium (Cr) dopant on structural, optical and photocatalytic properties of TiO 2 nanoparticles by a novel microwave irradiation method. The concentration of Cr is varied from 0 to 5 wt%. X-ray diffraction results suggest that both pure and Cr doped TiO 2 had tetr...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2018-04, Vol.29 (8), p.6501-6510
Main Authors: Senthil Kumar, R., Gnanavel, B., Jegatheesan, A.
Format: Article
Language:English
Subjects:
Absorption
Anatase
Catalytic activity
Characterization and Evaluation of Materials
Chemistry and Materials Science
Chromium
Crystal structure
Crystallinity
Doping
Dyes
Efficiency
Investigations
Light irradiation
Materials Science
Metal oxides
Microwaves
Morphology
Nanoparticles
Optical and Electronic Materials
Optical properties
Photocatalysis
Photoluminescence
R&D
Radiation
Research & development
Semiconductors
Spectrum analysis
Titanium dioxide
Titanium oxides
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Summary:This work deals with the effect of chromium (Cr) dopant on structural, optical and photocatalytic properties of TiO 2 nanoparticles by a novel microwave irradiation method. The concentration of Cr is varied from 0 to 5 wt%. X-ray diffraction results suggest that both pure and Cr doped TiO 2 had tetragonal anatase type structure with single crystalline nature. Transmission electron microscope measurement showed that well crystalline spherical morphology and the average particles size was found to be about 25–45 nm. The absorption edges of TiO 2 shift towards longer wavelengths (i.e. red shifted) from 366 to about 459 nm with increasing Cr concentration, which greatly improve the UV absorption of TiO 2 nano-materials. The photocatalytic activity of the catalyst powders evaluated by using three types of dyes such as azo-Methyl Red, Congo Red, Orange G under UV light irradiation. The result showed that the photocatalytic property was significantly improved by Cr doping. The superior photocatalytic mechanism by Cr doping was also discussed in detail. The samples were further characterized by photoluminescence and energy dispersive spectra analysis.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-018-8632-0