Synthesis of Titanium Dioxide in Hydrogen Peroxide Solution and its Photocatalytic Character

Abstract:

TiO₂ nanocrystals were synthesized from Titanium Tetraisopropoxide in H₂O₂ solution, and utilized as photocatalysts for degradation of humic acid in aqueous solution. The highly pure TiO₂ nanocrystals were obtained by excluding the use of inorganic acids that might consequently cause contamination of active catalytic surface sites of the nanocrystals by Cl^-, NO₃^- and SO₄^2-. Particle size and crystallinity of the nanocrystals were increased with progressing the refluxing time 1 ~ 9 h at 120°C in an oil bath. By varying H₂O₂/Ti = 5.5 ~ 55, the crystalline phase of anatase/rutile ratio of the nanocrystals was controllable. The photocatalytic properties of the nanocrystals were strongly dependent upon the crystallinity and particle size. The DOC removal of humic acid was most effective for the nanocrystals prepared at H₂O₂/Ti= 5.5 due to the mixed crystalline phase of anatase/rutile and the increased surface area by smaller particle size. The decreases of UV₂₅₄ absorbance of HAs solutions were much faster than those of DOC, and not so dependent upon the variations of TiO₂ nanocrystals.

• Periodical: Advanced Materials Research (Volume 827)
• Pages: 34-37
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.827.34
• Online since: October 2013
• Authors: Su Kim Wan, Seok Rhee Dong
• Keywords: Humic Acid (HA), Hydrogen Peroxide, Photocatalytic Degradation, Titanium Dioxide (TiO₂), Titanium Tetraisopropoxide

References

[1] A. Badis, F.Z. Ferradji, A. Boucherit, D. Fodil, H. Boutoumi: Desalination Vol. 4 (2010), p.216.

DOI: 10.1016/j.desal.2010.04.001

[2] M. Nystrii m, K. Ruohomtiki and L. Kaipia: Desalination Vol. 106 (1996), p.79.

[3] E.A. Ghabbour, G. Davies, Y.Y. Lam, M.E. Vozzella: Environ. Pollut. Vol. 131 (2004), p.445.

[4] H. Seki and A. Suzuki: J. Colloid. Interf. Sci. Vol. 171 (1995), p.490.

[5] E. Selli, V. Eliet, M.R. Spini and G. Bidoglio: Environ. Sci. Technol. Vol. 34 (2000), p.3742.

[6] B.R. Eggins, F.L. Palmer and J.A. Byrne: War. Res. Vol. 31 (1997), p.1223.

[7] X.Z. Li, C.M. Fan and Y.P. Sun: Chemosphere Vol. 48 (2002) 453.

[8] J.C. Garcia, J.I. Simionato, A.E. C. Ds Silva, J. Nojaki, N.E. de Souza: Solar Energy Vol. 83 (2009), p.316.

[9] H. Ichinose, M. Terasaki and H. Katsuki: J. Ceram. Soc. Jpn. Int. Edition Vol. 104, p.697.

[10] C. Wang and J.Y. Ying: Chem. Mater. Vol. 11 (1999), p.3113.

[11] D.C. Hurum, A.G. Agrios, K.A. Gray, T. Rajh and M.C. Thurnauer: J. Phys. Chem B Vol. 107 (2003), p.4545.