Browse > Article
http://dx.doi.org/10.12925/jkocs.2008.25.2.3

Photocatalytic Degradation of Organic Compounds over $xTiO_2$-$ySiO_2$ Powders Prepared by Sol-Gel Method  

Yang, Chun-Hoe (Department of Chemical Engineering, Hanbat National University)
Lee, Bong-Cheol (Chungnam Institute of Health & Environment)
Publication Information
Journal of the Korean Applied Science and Technology / v.25, no.2, 2008 , pp. 130-136 More about this Journal
Abstract
$xTiO_2$-$ySiO_2$ system photocatalysts were developed by sol-gel method based on the change of production parameters, and their structure of crystallization and the specific surface area were measured. Considering the efficiency of the ethanol and phenol degradation using the catalyst, the conclusions were obtained as follows: By means of X-ray analysis of $xTiO_2$-$ySiO_2$ powder that is obtained from Titanium and Silicon alkoxide by sol-gel process, it is shown that crystal structure of anatase type is a dominating structure and, on the other hand, the structure of rutile also partly exists. The increase of $SiO_2$ contents causes the decrease of the degree of crystallization of the gel, whereas the specific surface area preferentially increases. It is shown that more than 90% of ethanol and phenol are degraded when reaction time is about three and an hours, and the maximum degradation rate of ethanol and phenol is shown in $60TiO_2$-$40SiO_2$ catalyst.
Keywords
titanium alkoxide; sol-gel process; photocatalysts; surface area; anatase type;
Citations & Related Records
연도 인용수 순위
  • Reference
1 S. Cheng, S. J. Tsai and Y. F. Lee, Photocatalytic decomposition of phenol over $TiO_2$ of various structures, Catal, Today, 26, 245 (1995)
2 K. D. Keefer, "The Effect of Hydrolysis Conditions on the Structure and Growth of Silicate Polymer, Better Ceramics Through Chemistry", ed. C. J. Brinker and D. R. Ulrich, pp.15-24, North-Holland, (1984)
3 K. Okabe, K. Sayama, H. Kusama and H. Arakawa, Photo-oxidative coupling of Methane over $TiO_2$-based Catalysts. Chem. Lett., 925 (1997)
4 C. Anderson and A. J. Bard, An Improvement Photocatalyst of $TiO_2$/$SiO_2$ Prepared by Sol-Gel Synthesis, J. Phys. Chem. 99, 9882 (1995)   DOI
5 H. Kochkar and F. Figueras, Synthesis of Hydrophobic $TiO_2$-$SiO_2$ Mixed Oxides for the Epoxidation of Cyclohexene, J. of Catalysis. 171, 420 (1997)   DOI   ScienceOn
6 M. Wakamura, K. Hashimoto, and T. Watanabe, Photocatalysis by Calcium Hydroxyapatite Modified with Ti(IV): Albumin Decomposition and Bactericidal Effect, Langmuir, 19, 3428 (2003)   DOI   ScienceOn
7 K. Kato, Photosensitized Oxidation of Ethanol on alkoxy-derived $TiO_2$ Powders, Bull. Chem. Soc. Jpn., 65, 35 (1992)
8 G. Grabner, G. Li, R. M. Quint and N. Getoff, Pulsed laser-induced oxidation of phenol in acid aqueous $TiO_2$ sols., J. Chem. Soc. Faraday Trans., 87, 1097 (1991)   DOI
9 L. C. Klein and G. J. Garvey, "Effect of water on acid and base catalyzed hydrolysis of tetraethylorthosilicate (TEOS), Better Ceramics Through Chemistry", ed. D. R. Ulrich, pp.33-40, North-Holland, (1984)
10 W. C. Hao, S. K. Zheng, C. Wang and T. M. Wang, Comparation of the Photocatalytic Activity $TiO_2$ Powder with Different Particle Size, J. of Material Sci. Letters, 21, 1677 (2002)   DOI   ScienceOn
11 K. Iseda, Oxygen Effect on Photocatalytic Reaction of Ethanol over Some Titanium Dioxide Photocatalysts, Bull. Chem. Soc. Jpn., 64, 1160 (1991)   DOI
12 H. Hidaka, T. Shimra and N. Sepone, Photodegration Non-ionic Surfactants in Aqueous Titanium dioxide Suspension, J. Photochem. Photobil. A : Chem., 42, 375 (1988)   DOI   ScienceOn
13 F. Masamichi, S. Yoshihara and O. Tetsuo, Heterogeneous Photocatalytic oxidation of aromatic compounds on $TiO_2$, Nature, 293, 206 (1981)   DOI
14 A. Sclafani, L. Palmisano and E. Davi, Photocatalytic degradation of phenol in aqueous polycrystalline $TiO_2$ dispersion, J. Photochem. Photobiol. A. Chem., 56, 113 (1991)   DOI   ScienceOn
15 D. E. Clark, "Ultrastructure Processing of Ceramics Glass and Composite", Wiley, New York, p.270 (1984)
16 H. Tada and M. Tanaka, Dependence of $TiO_2$ Photocatalytic Activity upon its Film Thickness, Langmuir, 13, 360 (1997)   DOI   ScienceOn
17 S. T. Martin, C. L. Morrison and M. R. Hoffmann, Photocatalytic mechanism of size-quantized Vanadium-doped $TiO_2$ particles, J. Phys. Chem., 98, 13694 (1994)
18 S. Sakka, "Treatise on Materials Science and Technology", Academic Press, New York, 22, 129 (1982)
19 H. Hidaka and J. Zhao, Photodegradation of Surfactants Catalyzed by a $TiO_2$ Semiconductor, Colloids and Surf., 67, 165 (1992)   DOI   ScienceOn