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Received April 14, 2008
Accepted June 21, 2008
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Photocatalytic degradation of methylene blue and acetaldehyde by TiO2/glaze coated porous red clay tile
Seung-Joon Yoo
Se-Il Lee
Dong-Heui Kwak†
Kwang-Gil Kim1
Kyung-Jun Hwang2
Jae-Wook Lee2
Un-Yeon Hwang3
Hyung-Sang Park4
Jong-Ok Kim5
Faculty of Environmental and Chemical Engineering, Seonam University, 720 Gwangchi-dong, Namwon 590-711, Korea 1Faculty of Design, Seonam University, 720 Gwangchi-dong, Namwon 590-711, Korea 2Department of Chemical Engineering, Chosun University, 375, Seosuk-dong, Dong-gu, Gwangju 501-759, Korea 3Department of Bio-Chemical Engineering, Dongyang University, Punggi, Yeongju 750-711, Korea 4Department of Chemical Engineering, Sogang University, 1 Sinsoo-dong, Mapo-gu, Seoul 121-742, Korea 5Inwol Ceramics Company, 21-13, Joonggunri, Inwol, Namwon 590-842, Korea
kwak124@hanmail.net
Korean Journal of Chemical Engineering, September 2008, 25(5), 1232-1238(7), 10.1007/s11814-008-0204-1
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Abstract
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.
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