二氧化鈦擔載碳材用於甲基橙光降解之效能

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二氧化鈦擔載碳材用於甲基橙光降解之效能

The Performance of Carbon-Coated Titanium Dioxide for Photodegradation of Methyl Orange

陳婉貞 , Masters　　Advisor：翁鴻山　　

繁體中文

吸附；甲基橙；光降解；酚醛樹脂；二氧化鈦擔載碳材； carbon-coated TiO2 ； phenolic formaldehyde resin ； methyl orange ； adsorption ； photodegradation

Abstract │ Reference (59) │ Times Cited (3) │ Altmetrics

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Composite photocatalysts for photodegradation of methyl orange (MO) were prepared by coating carbon on titanium dioxide (Merck anatase, TiO2(M)) with phenolic formaldehyde resins as precursors. The effects of molecular weight of phenolic formaldehyde resin, carbonization temperature, amount of phenolic formaldehyde resin and change of the active species (Degussa P25 TiO2) on the performance of these composite photocatalysts were investigated in this study. The adsorption capability and photocatalytic activities of the prepared photocatalysts were compared with those of commercial titanium dioxide (Merck anatase TiO2 and Degussa P25 TiO2). Experimental results show that carbon coated on titanium dioxide can increase not only MO adsorption but also degradation rate of MO. Phenolic formaldehyde resin of low molecular weight (PF4161) is the most suitable carbon precursor. The composite photocatalyst prepared with 0.167 g of PF4161 / g of TiO2(M) and calcined at 700 oC exhibits a higher photo- degradation rate of methyl orange than others and has a similar activity as commercial Degussa P25 TiO2. However, a large amount of coated carbon on TiO2 results in a decrease in degradation rate of MO due to the shield of UV irradiating on the surface of TiO2 by carbon. Carbon coated on Degussa P25 TiO2 could not improve the degradation rate of MO probably due to that particle sizes of Degussa P25 TiO2 were too small to be coated with larger carbon particles on their surface.

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[01] A. W. Jacoby, D. M. Blake, J. A. Fennell, J. E. Boulter, and L. M. Vargo, Hetergeneous Photocatalysis for Control of Volatile Organic Compounds in Indoor Air., The 88th Air & Waste Management Assoication, 46, 891, (1996).
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[02] M. Grätzel, Powering the Planet., Nature, 403, 363, (2000).
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[04] A. Fujishima, and K. Honda, Electrochemical Photolysis of Water at a Semiconductor Electrode., Nature, 238, 37, (1972).
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[05] S. N. Frank, and J. Bard, Heterogeneous Photocatalytic Oxidation of Cyanide Ion in Aqueous Solutions at TiO2 Powder., Journal of the American Chemical Society, 99, 303, (1977).
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[09] T. Sakata, and T. Kawai, Photosynthesis and Photocatalysis with Semi- conductor Powders, Energy Resources through Photochemistry and Catalysis, 331, (1983).
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