Effect of Doping Transition Metal Ions on Photocatalysis of TiO₂ Nanowires

Abstract:

In order to restrain the recombination of electron-hole pairs of photocatalysis and induce the absorption spectra to shift to the visible region, TiO₂ nanowire arrays doped with different transition metal ions were prepared by sol-electrophoresis deposition method. The photocatalytic activities of all doped nanowire arrays (M/TiO₂) were measured under visible light. Transition metal ions (Fe³⁺, Zn²⁺, Cr³⁺ and Cu²⁺) were chosen as doping ions. The best doping content of each ion was found via photocatalytic degradation of methyl orange solution under visible light, there are 0.5 wt% Fe³⁺，1.0 wt% Zn²⁺，0.5 wt% Cr³⁺ and 0.25 wt% Cu²⁺ respectively. Under the best doping content of each ion for M/TiO₂ nano-arrays, the photocatalytic activities are Fe>Zn>Cu>Cr. The effect mechanisms are discussed from different views of doped semiconductor and surface oxygen absorption.

• Periodical: Applied Mechanics and Materials (Volumes 217-219)
• Pages: 203-206
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.217-219.203
• Online since: November 2012
• Authors: Yu Ming Tian, Yuan Yuan Zhao, Chang Wei Gong, Yue Sheng Chai
• Keywords: Doping Ions, Photocatalysis, TiO₂ Nanowire Arrays, Transition Metal

References

[1] Yuming Tian, Mingxia Xu, Xiangzhi Liu, et al. Chinese Science Bulletin, 2006, 51(12): 1515.

[2] Yuming Tian, Yuanyuan Zhao, et al. Advanced Materials Research, 2011, 391-392: 1200-1204.

[3] Legrini O, Oliveros E, Braun A M. Chem Rev, 1993, 93(2): 671.

[4] P Y Zhang, G Yu, Z P Jiang. A dvan Envi ron Sci, 1997, 5 (3) : 1. (in Chinese)

[5] Ch Y Wang, Ch Y Liu, T Shen. Chem J Chin Univ, 1998, 19 (12) : 2013. ( in Chinese)

[6] Jianbo Wang, Shouci Lu. New Chemical Materials, 2005, 33(5): 49-51. (in Chinese)

[7] Y M Tian, etal. Chemical Industry and Engineering Progress, 2005, 8: 849~853. (in Chinese)

[8] Xiangzhi Liu, Mingxia Xu, Yuming Tian. T Nonferr Metal Soc, Part A, 2006, 16: 341-344.

[9] Ping Yang, Cheng Lu, et al. Materials Letters, 2002, 57: 794–801.

[10] Shuxin Wu, et al. Photographic Science and Photochemistry, 2005, 23(2): 94-101. (in Chinese)

[11] Zh L Wang. Physical Chemistry [M]. Beijing: Higher Education Press, 2001. (in Chinese)