preparation of porous f-wo3/tio2 films with visible-light photocatalytic activity by microarc oxidation
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2012
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Abstract
Porous F-WO3/TiO2 (mTiO2) films are prepared on titanium sheet substrates using microarc oxidation (MAO) technique. The X-ray diffraction patterns show that visible-light (Vis) enabling mTiO2 films with a very high content of anatase TiO2 and high loading of WO3 are successfully synthesized at a low applied voltage of 300 V using electrolyte contenting NaF and Na2WO4 without subsequent heat treatment. The cross-sectional transmission electron microscopy micrograph reveals that the mTiO2 films feature porous networks connected by many micron pores. The diffused reflection spectrum displays broad absorbance across the UV-Vis regions and a significant red shift in the band gap energy (∼2.23 eV) for the mTiO2 film. Owing to the high specific surface area from the porous microstructure, the mTiO2 film shows a 61% and 50% rate increase in the photocatalytic dye degradation, as compared with the N,C-codoped TiO2 films under UV and Vis irradiation, respectively.
| Reference Key |
yeh2012internationalpreparation
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| Authors | ;Chung-Wei Yeh;Kee-Rong Wu;Chung-Hsuang Hung;Hao-Cheng Chang;Chuan-Jen Hsu |
| Journal | construction and building materials |
| Year | 2012 |
| DOI |
10.1155/2012/285129
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