Crystallization and Photocatalytic-Activity of TiO₂ Doped with Metal Ions Prepared by Adsorption Phase Synthesis

Abstract:

TiO2 photocatalysts doped with different metal ions were prepared by adsorption phase synthesis. The influence of different dopant metal ions with various concentrations on the crystallization of TiO2 was ex-plored by XRD. Then photodegradation experiments of methyl-orange were employed to evaluate the activity of these photocatalysts. The results indicated that the crystallization of TiO2 was restricted after doping, due to replacement of Ti4+ in TiO2 lattice structure by other metal ions. And the restriction became stronger with radius and concentration of doping ions increasing. There was an optimum dopant concentration appeared during preparation of TiO2 doped with Cd2+ and Fe3+. When dopant concentration was less or more than this optimum value, the photocatalytic activity of TiO2 doped with metal ions was lower than that of TiO2 without doping. Since radius of Fe3+ was close to Ti4+, the influence of Fe3+ dopant concentration on crystallization and activity of TiO2 was more obvious than that of Cd2+ doping.

• Periodical: Advanced Materials Research (Volume 624)
• Pages: 194-199
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.624.194
• Online since: December 2012
• Authors: Ting Wang, Yan Dong Mao, Fang Peng Tang, Jun Xing, Li Guang Wu
• Keywords: Adsorption Phase Synthesis, Metal Ions Doping, Methyl-Orange, Photodegradation, TiO₂

References

[1] E.R. Carraway, A.J. Hoffman, M.R. Hoffmann, Photocatalytic oxidation of organic acids on quantum-sized semiconductor colloids. Environ. Sci. Technol. 28 (1994) 786-793.

DOI: 10.1021/es00054a007

[2] C. Kormann, D. W. Bahnemann, M.R. Hoffmann, Preparation and characterization of quantum-size titanium dioxide. J. Phys. Chem. 92 (1988) 5196-5201.

DOI: 10.1021/j100329a027

[3] F. Dina, K. John, A. David, Size effects in photoprocesses on dispersed catalysts. J. Phys. Chem. 93 (1989) 5851-5854.

[4] M. A. Fox, M. T. Dulay, Heterogeneous photocatalysis. Chem. Rev. 93 (1993): 341-357.

[5] I. Dekany, L. Turi, E. Tombacz, et al. Preparation of size-quantized CdS and ZnS particles in nanophase reactors provided by binary liquids adsorbed at layered silicates. Langmuir 11 (1995) 2285-2292.

DOI: 10.1021/la00006a069

[6] X. Jiang, T. Wang, Influence of preparation method on morphology and photocatalysis activity of nanostructured TiO2. Environ. Sci. Technol. 41 (2007) 4441-4446.

DOI: 10.1021/es070106v

[7] T. Wang, X. Jiang, Y. X. Wu, Influence of crystallization of nano TiO2 prepared by adsorption phase synthesis on photodegradation of gaseous toluene. Ind. Eng. Chem. Res., 48 (2009) 6224-6228.

DOI: 10.1021/ie801974y

[8] M. R. Hoffmann, S. T. Martin, W. Choi, et al. Environmental applications of semiconductor photocatalysis. Chem. Rev. 95(1995) 69-96.

[9] V. Subramanian, E.E. Wolf, V.P. Kamat catalysis with TiO2/Gold nanocomposites. effect of metal particle size on the fermi level equilibration. J. Am. Chem. Soc. 126 (2004) 4943-4950.

DOI: 10.1021/ja0315199

[10] L. Palmisano, V. Augugliaro, A. Sclafani, et al. Activity of chromium-ion-doped titania for the dinitrogen photoreduction to ammonia and for the phenol photodegradation. J. Phys. Chem. 92 (1988) 6710-6713.

DOI: 10.1021/j100334a044

[11] W. Choi, A. Termin, R. M. Hoffmann, The role of metal ion dopants in quantum-sized TiO2: correlation between photoreactivity and charge carrier recombination dynamics. J. Phys. Chem. 98 (1994) 13669-13679.

DOI: 10.1021/j100102a038

[12] L. A. Linsebigler, G. Q. Lu, T. J. Yates, Photocatalysis on TiO2 surfaces: principles, mechanisms, and selected results. Chem. Rev. 95 (1995) 735-758.

DOI: 10.1021/cr00035a013