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KMID : 1024520050140090889
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Journal of the Environmental Sciences
2005 Volume.14 No. 9 p.889 ~ p.896
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Effects of Calcination Temperature on Ti02 Photocatalytic Activities
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Kim Seung-Min
Yun Tae-Kwan
Hong Dae-Il
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Abstract
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The nanosized photocatalysts were prepared by the hydrolysis of and calcined at different temperatures. The resulting materials were characterized by TGA, DSC, XRD, and TEM testing techniques. XRD, TEM, and BET measurements indicated that the particle size of was increased with rise of calcination temperature and surface area was decreased with rise of it. The prepared photocatalysts were used for the photocatalytic degradation of congo red. The effects of calcination temperature, loading, the initial concentration of congo red, and usage frequencies were investigated and the rate constants were determined by regressing the experimental data. Calcination is an effective treatment to increase the photo activity of nanosized photocatalysts resulting from the improvement of crystallinity. The optimum calcination temperature of the catalyst for the efficient degradation of congo red was found to be . The rate constant was decreased with increase in the initial concentration of congo red and increased with increase in the loading. In the case of photocatalysts, the photocatalytic activity wasn’t greatly affected by the usage frequencies.
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KEYWORD
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TiO2, Photocatalyst, Calcination, Congo red
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