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| Preparation and Characterization of Micron Cr2O3 Particles Coated by TiO2 Nanoparticles |
| Received:May 17, 2017 Revised:September 15, 2017 |
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| DOI：10.7643/ issn.1672-9242.2017.09.002 |
| KeyWord:TiO2 nanoparticles Cr2O3 composite particles photocatalysis activity |
| Author | Institution |
| LIU Hai-mei |
China Huayin Weapon Test Center, Huayin , China |
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| Abstract: |
| Objective To study phase constituent, microstructure and photocatalysis activity of micron Cr2O3 particles coated by nano TiO2 at room temperature. Methods Nano-TiO2/micro-size Cr2O3 composite particles were first prepared by gel-precipitation method and acid catalysis with Ti (OBu)4 as raw material. The composite particles were characterized by SEM, XPS, XRD, Raman, UV-Vis spectrum, etc. Results XPS analysis showed that the element C, O, Ti and Sn existed on the surfaces of composite particles. Observation by field emission scanning electronic microscope showed that TiO2 particles of 10-15 nm covered Cr2O3 powder surface and formed nanometer/micron composite particles. UV-Vis spectra analysis showed that samples of TiO2 particles obtained in the no-load test showed an anatase type. UV-Vis spectral analysis showed apparent red shift of the absorption peaks in the semiconductors after loading nano-TiO2. There were three peaks at 370 nm, 460 nm and 600nm, and the maximum absorption wavelength was about 750 nm. Conclusion TiO2 of anatase type can be synthesized on the surface of Cr2O3 particles. The optical response range of composite semiconductors is extended, and the visible light photocatalytic activity is expected to be realized. |
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