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Received March 12, 2007
Accepted May 2, 2007
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Preparation of TiO2/SiO2 hollow spheres and their activity in methylene blue photodecomposition
Yonsei Center for Clean Technology, Yonsei University, 134 Sinchon-dong, Seodaemun-gu, Seoul 120-749, Korea 1Department of Chemical Engineering, Seoul National University of Technology, Seoul 139-743, Korea
Korean Journal of Chemical Engineering, July 2007, 24(4), 596-599(4), 10.1007/s11814-007-0009-7
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Abstract
PSA [poly-(styrene-methyl acrylic acid)] latex particle has been taken into account as template material in SiO2 hollow spheres preparation. TiO2-doped SiO2 hollow spheres were obtained by using the appropriate amount of Ti(SO4)2 solution on SiO2 hollow spheres. The photodecomposition of the MB (methylene blue) was evaluated on these TiO2-doped SiO2 hollow spheres under UV light irradiation. The catalyst samples were characterized by XRD, UV-DRS, SEM and BET. A TiO2-doped SiO2 hollow sphere has shown higher surface area in comparison with pure TiO2 hollow spheres. The 40 wt% TiO2-doped SiO2 hollow sphere has been found as the most active catalyst compared with the others in the process of photodecomposition of MB (methylene blue). The BET surface area of this sample was found to be 377.6 m2g-1. The photodegradation rate of MB using the TiO2-doped SiO2 catalyst was much higher than that of pure TiO2 hollow spheres.
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