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29 March 2004 Photodecomposition ability of acicular typed TiO2 ultrafine powder with rutile phase in aqueous 4-chlorophenol solutions
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Photo decomposition ability of ultra-fine rutile TiO2 powder was investigated using the photo-catalytic reaction in aqueous 1.0 mmol 4-chlorophenol (4CP) solutions with pH-controlled conditions. Its photo-catalytic characteristics were then compared with those of commercial P-25 powder having mainly anatase phase. When 4CP was completely decomposed by the photo-catalytic reaction, HPPLTed TiO2 powder was more effective than the P-25 powder regardless of the crystalline structures. As the photo-catalytic reaction time increased, the decomposition of 4CP in the aqueous solution was accompanied with much consumption of OH- ions. However, in the case of the aqueous solution at pH=4 naturally obtained by mixing of water and 4CP, the photo-catalytic reaction of the HPPLTed TiO2 powder occurred more actively, compared with in the cases of the more acidic and caustic aqueous solutions. Therefore, it is thought that the decomposition of non-degradable 4CP would take place well at a certain amount of OH- ion concentration in the aqueous solution, considering to show no difference in the adsorption of 4CP on the surface of TiO2 particle with various pHs of the solution, when the HPPLTed TiO2 powder with high surface areas more than 180 m2/g was used.
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Jae Sung Song, Hyun Ju Kim, Bo Kun Koo, Dong Yun Lee, Won Jae Lee, and Sun Jae Kim "Photodecomposition ability of acicular typed TiO2 ultrafine powder with rutile phase in aqueous 4-chlorophenol solutions", Proc. SPIE 5275, BioMEMS and Nanotechnology, (29 March 2004);

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