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Received March 6, 2007
Accepted April 30, 2007
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Photocatalytic activity of nitrogen-substituted TiO2 deposited with Pt and Ru
Greenhouse Gas Research Center, Fossil Energy & Environment Research Department, Korea Institute of Energy Research, 71-2 Jang-dong, Yuseong-gu, Daejeon 305-343, Korea 1Department of Environment Engineering, Yonsei University, Wonju, Gangwon-do 220-710, Korea 2Department of Chemistry, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, Korea
hkjoo@kier.re.kr
Korean Journal of Chemical Engineering, November 2007, 24(6), 1031-1036(6), 10.1007/s11814-007-0116-5
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Abstract
In this work, Pt- and Ru-deposited, nitrogen-substituted TiO2 were prepared and characterized by the discoloration of MB and H2 evolution. The characteristics were evaluated in terms of methylene blue (MB) discoloration, open circuit voltage (OCV), photocurrent (Iph), and hydrogen production. First, the Pt-deposited TiON revealed comparable activity in MB discoloration, while both TiONs resulted in somewhat less activity than P25. Second, an external bias was systematically applied to electrodes made of the prepared samples, resulting in -0.41~0.51 OCV,-400~400 μA and noticeable hydrogen evolution above 300 μA in absolute value when a bias of -1.5~1.5 V was applied to the working electrode of P25. The electrolyte and light intensity affected the light-responsive characteristics of the photocatalysts, confirming the relationship between OCV, Iph and H2 and that metal deposition slightly inhibited the Iph and H2 evolution while Ru-deposited TiON did not degrade MB effectively.
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Jin S, Shiraishi F, Chem. Eng. J., 97(2-3), 203 (2004)
Li FB, Li XZ, Chemosphere, 48, 1103 (2002)
Vorontsov AV, Stoyanova IV, Kozlov DV, Simagina VI, Savinov EN, J. Catal., 189(2), 360 (2000)
Ohno T, Tanigawa F, Fujihara K, Izumi S, Matsumura M, J. Photochem. Photobiol. A-Chem., 127, 107 (1999)
Sasirekha N, Basha SJS, Shanthi K, Appl. Catal. B: Environ., 62(1-2), 169 (2006)
Shin H, Joo H, Park J, Lee CH, Mater. Sci. Forum, 449, 1257 (2004)
Briggs D, Seah MP, Practical surface analysis: by auger and X-ray photoelectron spectroscopy, John Wiley & Sons, New York (1983)
Wagner CD, Riggs WM, Davis LE, Moulders JF, Mullenberg GE, Handbook of X-ray photoelectron spectroscopy, Perkin-Elmer Corporation, Eden Prairie, MN (1979)
Yu JG, Zhao XJ, Zhao QN, Mater. Chem. Phys., 69(1-3), 25 (2001)
Park H, Choi W, J. Phys. Chem. B, 109(23), 11667 (2005)
He C, Li X, Xiong Y, Zhu X, Liu S, Chemosphere, 58, 381 (2005)
