Photodegradation of MB on Fe/CNT-TiO2 Composite Photocatalysts Under Visible Light

Kan Zhang; Ze-Da Meng; Jong Geun Choi; Won-Chun Oh

Korean Journal of Materials Research, Vol.20, No.5, 246-251, May, 2010

DOI10.3740/MRSK.2010.20.5.246 Export Citation

Photodegradation of MB on Fe/CNT-TiO2 Composite Photocatalysts Under Visible Light

Kan Zhang, Ze-Da Meng, Jong Geun Choi, and Won-Chun Oh^†

Department of Advanced Materials & Science Engineering, Hanseo University, Chungnam 356-706, Korea

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The composite photocatalysts of a Fe-modified carbon nanotube (CNT)-TiO2 were synthesized by a two-step solgel method at high temperature. Its chemical composition and surface properties were investigated by BET surface area, scanning electron microscope (SEM), Transmission Electron Microscope (TEM), X-ray diffraction (XRD) and ultraviolet-visible (UV-Vis) spectroscopy. The results showed that the BET surface area was improved by modification of Fe, which was related to the adsorption capacity for each composite. Interesting thin layer aggregates of nanosized TiO2 were observed from TEM images, probably stabilized by the presence of CNT, and the surface and structural characterization of the samples was carried out. The XRD results showed that the Fe/CNT-TiO2 composites contained a mix of anatase and rutile forms of TiO2 particles when the precursor is TiOSO4·xH2O (TOS). An excellent photocatalytic activity of Fe/CNT-TiO2 was obtained for the degradation of methylene blue (MB) under visible light irradiation. It was considered that Fe cation could be doped into the matrix of TiO2, which could hinder the recombination rate of the excited electrons/holes. The photocatalytic activity of the composites was also found to depend on the presence of CNT. The synergistic effects among the Fe, CNT and TiO2 components were responsible for improving the visible light photocatalytic activity.

Keywords:Fe/CNT-TiO2 composites;modification;visible light;MB

[References]

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[1] Fujishima A, Rao TN, Tryk DA, J. Photochem. Photobiol. C., 1, 1 (2000)

[2] Hoffmann MR, Martin ST, Choi WY, Bahnemann DW, Chem. Rev., 95(1), 69 (1995)

[3] Wang XH, Li JG, Kamiyama H, Moriyoshi Y, Ishigaki T, J. Phys. Chem. B, 110(13), 6804 (2006)

[4] Ghasemi S, Rahimnejad S, Setayesh SR, Rohani S, Gholami MR, J. Hazard. Mater., 172(2-3), 1573 (2009)

[5] Liu D, Kamat PV, Thomas KG, Thomas KJ, Das S, George MV, J. Chem. Phys., 106(15), 6404 (1997)

[6] Zhang K, Oh WC, Korean J. Mater. Res., 20(1), 31 (2010)

[7] Asahi R, Morikawa T, Ohwakl T, Aoki K, Taga Y, Science, 293, 269 (2001)

[8] Kisch H, Zang L, Lange C, Maier WF, Antonius C, Meissner D, Angew. Chem. Int. Ed., 37, 3034 (1998)

[9] Zhang K, Meng ZD, Oh WC, Korean J. Mater. Res., 20(3), 117 (2010)

[10] Oh WC, Chen ML, J. Cer. Proc. Res., 8, 316 (2007)

[11] Ohno T, Akiyoshi M, Umebayashi T, Asai K, Mitsui T, Matsumura M, Appl. Catal. A: Gen., 265(1), 115 (2004)

[12] Treschev SY, Chou PW, Tseng YH, Wang JB, Perevedentseva EV, Cheng CL, Appl. Catal. B: Environ., 79(1-2), 8 (2008)

[13] Itoh E, Suzuki I, Miyairi K, Jap. J. Appl. Phys., 44, 636 (2005)

[14] Dresselhaus MS, Biro LP, Bernardo CA, Tibbetts GG, Lambin P, Carbon Filaments and Nanotubes: Common Origins, Differing Applications, Kulwer Academic Publishers, Dordrecht, 2000, p. 11. (2000)

[15] Cong Y, Zhang JL, Chen F, Anpo M, He D, J. Phys. Chem. C., 111, 10618 (2007)

[16] Zhang FJ, Chen ML, Zhang K, Oh WC, Bull. Kor. Chem. Soc., 31, 133 (2010)

[17] Oh WC, Zhang FZ, Chen ML, J. Ind. Eng. Chem., 16(2), 321 (2010)

[18] Tryba B, Toyoda M, Chemosphere., 60, 477 (2005)

[19] Tryba B, Morawski AW, Inagaki M, Toyoda M, Chemosphere., 64, 1225 (2006)

[20] Tryba B, Piszcz M, Grzmil B, Pattek-Janczyk A, Morawski AW, J. Hazard. Mater., 162(1), 111 (2009)

[21] Chen C, Zhao W, Li J, Zhao J, Hidaka H, Environ. Sci. Technol., 36, 3604 (2002)

[22] Zhang XW, Lei LC, Appl. Surf. Sci., 254(8), 2406 (2008)

[23] Zhang K, Meng ZD, Ko WB, Oh WC, Analy. Sci & Technol., 22, 254 (2009)