Effect of sulfate ions for sol–gel synthesis of titania photocatalyst |
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Authors: | Suzuko Yamazaki Nobuo Fujinaga Kensuke Araki |
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Affiliation: | Department of Chemistry, Faculty of Science, Yamaguchi University, Yamaguchi 753-8512, Japan |
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Abstract: | We have found that the use of sulfuric acid in the peptization process of sol–gel method produced SO42?-incorporated TiO2 which is mechanically strong by firing at low temperature such as 200°C. The synthesized TiO2 has larger specific surface area and retards the phase transition from anatase to rutile compared with that prepared from the peptization with nitric acid. The S-content of the TiO2 fired at 200°C was 1.52 wt.%; the value has a maximum of 2.74 wt.% at 400°C. The XPS measurements indicate that S exists mainly as SO42?. The TiO2 fired at 400°C showed the highest photocatalytic activity for ethylene degradation. Especially, we would like to emphasize the TiO2 sintered at 200°C because they are extremely hard in spite of such a low sintering temperature. This photocatalyst may provide a great opportunity for extensive applications as self-supporting membranes. |
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Keywords: | TiO2 Sulfate ion Ethylene Photocatalyst Vickers hardness |
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