Preparation and Photocatalytic Performance of α-SiW₁₁Ti/PANI/TiO₂ Nanocomposite

Abstract:

An efficient α-SiW₁₁Ti/PANI/TiO₂ nanocomposite photocatalyst was prepared by a In-stiu polymerization method. (NH₄)₂S₂O₈ was used as an oxidant to form polyaniline-wrapped TiO₂ particles and then by an electrostatic assembly of α-SiW₁₁Ti. The α-SiW₁₁Ti/PANI/TiO₂ nanocomposite were characterized by UV-visible absorption spectrum (UV-Vis), Fourier transformation infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The photocatalytic activity in degradation of malachite green on the α-SiW₁₁Ti/PANI /TiO₂ was carried out in an aqueous solution. The results show that the sensitizing effect of PANI can improve the light response of TiO₂ and enhance the separation efficiency of electron and hole pairs, which in turn promotes the photocatalytic activity of the composites. This novel photocatalyst exhibits high photocatalytic activity to decompose malachite green under 30 W ultraviolet light irradiation. The malachite green was degraded by 97.53% after 90 min irradiation on the α-SiW₁₁Ti/PANI/TiO₂ nanocomposite, which was better than that of Degussa P25 (TiO₂) and PANI/TiO₂.

• Periodical: Materials Science Forum (Volumes 743-744)
• Pages: 837-842
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.743-744.837
• Online since: January 2013
• Authors: Rong Hua Ma, Li Yang Deng, Dan Dan Wang
• Keywords: In Stiu Polymerization, Malachite Green Degradation, Photocatalytic, α-SiW₁₁Ti/PANI/TiO₂

References

[1] H.H. Wang, C.S. Xie, W. Zhang, et al., Comparison of dye degradation efficiency using ZnO powders with various size scales, Journal of Hazard Maters. 141 (2007) 645-652.

DOI: 10.1016/j.jhazmat.2006.07.021

[2] F.L. Zhang, J.C. Zhao, L. Zang, et al., Photoassisted degradation of dye pollutants in aqueous TiO2 dispersions under irradiation by visible light, Journal of Molecular Catalysis A: Chemical. 120 (1997) 173-178.

DOI: 10.1016/s1381-1169(96)00405-0

[3] Q. He, S.H. Si, F. Liang, et al., Dioxide manganese oxide synthesized polyaniline/silica composite particles for anti-corrosion coating, Coatings industry. Paint Industry. 39 (2009) 37-45.

[4] S.X. Min, F. Wang, Z.M. Zhang, et al., PANI/AMTES-TiO2 nanocomposites and their photocatalytic properties, Journal of Physical Chemistry. 25 (2009) 1303-1310.

[5] E. Gkika, A. Troupis, A. Hiskia, et al., Photocatalytic reduction of chromium and oxidation of organics by polyoxometalates, Applied Catalysis B: Environmental. 62 (2006) 28–34.

DOI: 10.1016/j.apcatb.2005.06.012

[6] W.H. Huang, J.B. Wang, J.J. Xue, et al., H4SiW12O40/TiO2/beads photocatalytic degradation of Methylene Blue, Chinese Journal of Environmental Engineering. 3 (2009) 1193-1198.

[7] A. Tézé,G. Hervé, Formation et isomerisation des undeca et dodeca tungstosilicates et germanates isomeres, J. Inorg. Nucl. Chem. 39 (1977) 999-1002.

DOI: 10.1016/0022-1902(77)80251-0

[8] R.H. Ma, L. Ma, C.T. Liu, et al., Synthesis, characterization and catalytic activity of positional isomers of titanium substituted tungstosilicates, Chin. J. Appl. Chem. 21 (2004) 256-260.

[9] J. Gong, X.J. Cui, Y.G. Chen, et al., UV-Vis spectra of N, N'-bis (4'-aminophenyl)-1, 4- quinonenediimine doped with H2SiW12O40, Macoromolecular Reseacrh. 12 (2004) 22-25.

DOI: 10.1007/bf03218990

[10] S.X. Min, F. Wang, Y. Q Han, An investigation on synthesis and photocatalytic activity of polyaniline sensitized nanocrystalline TiO2 composites, J Mater Sci. 42 (2007) 9966-9972.

DOI: 10.1007/s10853-007-2074-z

[11] E.B. Wang, C.W. Hu, L. Xu, Introduction to Polyoxometallate Chemistry, first ed, Chemistry Industry Press, Beijing, (1998).

[12] X.W. Li, G. C Wang X.X. Li, et al., Surface properties of polyaniline/nano-TiO2 composites, Appl. Surf. Scie. 229 (2004) 395-401.

DOI: 10.1016/j.apsusc.2004.02.022

[13] F.C. Wang, X.P. Xu, J. Gong, et al., Effect of polymers with different molecular weight on the conductivity of polyaniline doped with polyoxometalate, Material Letters. 59 (2005) 3982-3984.

[14] H, Tang, K. Prasad, R. Sanjinès, et al., Electrical and optical properties of TiO2 anatase thinfilms, J Appl Phys. 75 (1994) 2042-(2049).

[15] S.Q. Li, H. Huang, Y.Y. Xiao, et al., Photoelectric Properties of PANI/TiO2 and PANI/ TiO2/HCSA, Semiconductor Optoelectronics. 23 (2002) 57-60.

[16] J. Gong, X.J. Cui, Z.W. Xie, et al., The Solid-state Synthesis of Aniline H4SiW12O4 Materials, Synth. Met. 129 (2002) 187-92.

[17] W. Yang, A.J. Zhang, L.L. Jin, et al. PW12/PANI/TiO2 Nanocomposites Preparation, characterization and photocatalytic properties,. Journal of Northwest Normal University (Natural Science). 45 (2009) 63-68.