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Korean Journal of Chemical Engineering, Vol.25, No.5, 1232-1238, 2008
Photocatalytic degradation of methylene blue and acetaldehyde by TiO2/glaze coated porous red clay tile
Nanosized TiO2 sol synthesized by sol-gel method was successfully coated on the porous red clay tile (PRC tile) with micrometer sized pores. PRC tile was first coated with a low-firing glaze (glaze-coated PRC tile) and then TiO2 sol was coated on the glaze layer. A low-fired glaze was prepared at various blending ratios with frit and feldspar, and a blending ratio glazed at 700 oC was selected as an optimum condition. Then TiO2 sol synthesized from TTIP was dip-coated on the glazed layer (TiO2/glaze-coated PRC tile), and it was calcined again at 500 oC. Here, these optimum calcination temperatures were selected to derive a strong bonding by a partial sintering between TiO2 sol particles and glaze layer. Photocatalytic activity on the TiO2/glaze-coated PRC tile was evaluated by the extent of photocatalytic degradation of methylene blue and acetaldehyde. Methylene blue with the high concentration of 150 mg/l on the surface of TiO2/glaze-coated PRC tile was almost photodegraded within 5 hours under the condition of average UV intensity of 0.275 mW/cm2, while no photodegradation reaction of methylene blue occurred on the glaze-coated PRC tile without TiO2. Another photocatalytic activity was also evaluated by measuring the extent of photocatalytic degradation of gaseous acetaldehyde. The photodegradation efficiency in TiO2/glaze-coated PRC tile showed about 77% photocatalytic degradation of acetaldehyde from 45,480 mg/l to 10,536 mg/l after the UV irradiation of 14 hours, but only about 16% in the case of the glaze-coated PRC tile.
[References]
- Turchi CS, Ollis DF, J. Catal., 122, 178, 1990
- Karvinen S, Lamminmaki RJ, Solid State Sciences, 5, 1159, 2003
- Paz Y, Heller A, J. Mater. Res., 12, 2759, 1997
- Watanabe T, Nakajima A, Wang R, Minabe M, Koizumi S, Fujishima A, Hashimoto K, Thin Solid Films, 351(1-2), 260, 1999
- Nakajima A, Hashimoto K, Watanabe T, Takai K, Yamauchi G, Fujishima A, Langmuir, 16(17), 7044, 2000
- Hata S, Kai Y, Yamanaka I, Oosaki H, Hirota K, Yamazaki S, JSAE Rev., 21, 97, 2000
- Keleher J, Bashant J, Heldt N, Johnson L, Li Y, World J. Microbiol. Biotechn., 18, 133, 2002
- Sivalingam G, Nagaveni K, Hedge MS, Mardras G, Appl. Catal. B: Environ., 45, 23, 2003
- Yoo SJ, Kim JO, Korean Patent 432590, 2004
- Yu H, Yu J, Cheng B, Catal. Commun., 7, 1000, 2006
- Mills A, Lee SJK, Lepre A, J. Photochem. Photobiol. A-Chem., 155, 199, 2003
- Kobayashi H, Takahashi M, Kotani M, Chem. Phys. Lett., 349(5-6), 376, 2001
- Shimizu K, Imai H, Hirashima H, Tsukuma K, Thin Solid Films, 351(1-2), 220, 1999
- Chen JS, Kao JS, Lai GR, Wang WH, Appl. Optics, 36, 4403, 1997
- Mills A, Wang JS, McGrady M, J. Phys. Chem. B, 110(37), 18324, 2006
- Kato K, Tsuzuki A, Taoda H, Torii Y, Kato T, Butsugan Y, J. Mater. Sci., 29(22), 5911, 1994
- Sopyan I, Watanabe M, Murasawa S, Hashimoto K, Fujishima A, J. Photochem. Photobiol. A-Chem., 98, 79, 1996
- Falconer JL, Magrini-Bair KA, J. Catal., 179(1), 171, 1998
- Fujishima A, Tryk DA, Photoelectrical conversion, in: K. Honda (Ed.), Functionality of molecular systems, Springer, Tokyo, 2, 196, 1999
- Obuchi E, Sakamoto T, Nakano K, Shiraishi F, Chem. Eng. Sci., 54(10), 1525, 1999
- Blount MC, Kim DH, Falconer JL, Environ. Sci. Technol., 35, 1988, 2001
- Sano T, Negishi N, Uchino K, Tanaka J, Matsuzawa S, Takeuchi K, J. Photochem. Photobiol. A-Chem., 160, 93, 2003
- Sano T, Negishi N, Takeuchi K, Matsuzawa S, Sol. Energy, 77, 543, 2004
- Kurosaki Y, Yokoyama K, J. Phys. Chem. A, 106(47), 11415, 2002
- Chatterjee D, Dasgupta S, J. Photochem. Photobiol. C: Photochem. Rev, 6, 186, 2005
- Zhang T, Oyama T, Horikoshi S, Hidaka H, Zhao J, Serpone N, Sol. Energy Mater. Sol. Cells, 73, 287, 2002
- Huan K, Surf. Coat. Technol., 191, 155, 2005
- Miyauchi M, Nakajima A, Watanabe T, Hashmoto K, Chem. Mater., 14, 4714, 2002
- Zhi JF, Wang HB, Fujishima A, Ind. Eng. Chem. Res., 41(4), 726, 2002
- Sakai N, Fujishima A, Watanabe T, Hashimoto K, J. Phys. Chem. B, 107(4), 1028, 2003
- Zhang XT, Sato O, Taguchi M, Einaga Y, Murakami T, Fujishima A, Chem. Mater., 17, 696, 2005
- Fujishima A, Rao TN, Tryk DA, J. Photochem. Photobiol. C: Photochem. Rev., 1, 1, 2000
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