Services on Demand
Journal
Article
text new page (beta)
English (pdf)
Article in xml format
Article references
Automatic translation
Send this article by e-mailIndicators
-
Cited by SciELO -
Access statistics
Related links
-
Similars in
SciELO
Share
Permalink
Superficies y vacío
Print version ISSN 1665-3521
Superf. vacío vol.18 n.1 Ciudad de México Mar. 2005
Articles
Physical properties of TiO2 prepared by sol-gel under different pH conditions for photocatalysis
*Instituto Mexicano del Petróleo, Ingeniería Molecular-FQG. Eje Central Lázaro Cárdenas #152 México, D.F. 07730. México
**Universidad Autónoma Metropolitana-Iztapalapa, Depto. Química, Av. Atlixco #186, México, D.F. 09340. México
We present the characterization of the physical properties of titanium dioxide powders prepared by the Sol-Gel method. We set the gelling pH to values of 3 (TiO2-A), 7 (TiO2-N) and 9 (TiO2-B) to observe its effect on the properties of the material. In the three cases we obtained nanoparticulated materials with particle sizes between 10 nm and 20 nm. The larger surface areas were obtained at pH 3, which is several times larger than the other synthesized materials. Furthermore, with the gelling condition pH 3, it was possible to synthesize pure anatase phase titania. We present some preliminary results on the test of photocatalytic activity of the synthesized materials in the reduction of nitric oxide.
Keywords: TiO2; Titanium dioxide; Titania; Sol-gel; Nanoparticles; Photocatalysis
Presentamos la caracterización de las propiedades físicas de polvos de dióxido de titanio preparados por el método de Sol-Gel. Fijamos el pH de gelación en los valores de 3 (TiO2-A), 7 (TiO2-N) y 9 (TiO2-B) para observar su efecto sobre las propiedades del material. En los tres casos obtuvimos materiales nanoparticulados con tamaños de particula entre 10 y 20 nm. Las áreas superficiales más grandes fueron obtenidas a pH 3, las cuales son varias veces mayores que las de los otros materiales sintetizados. Adicionalmente, con la condición de gelación pH 3, fue posible sintetizar titania con fase anatasa pura. Presentamos algunos resultados preliminares de la prueba de actividad fotocatalítica de los materiales sintetizados en la reducción de óxido nítrico.
Palabras clave: TiO2; Dioxido de titanio; Titania; Sol-gel; Nanopartículas; Fotocatálisis
Acknowledgments
Authors want to thank R. Velázquez Lara for technical assistance and the Instituto Mexicano del Petróleo (IMP) for financial support. One of the authors (MASA) is indebted to the IMP for a postdoctoral fellowship.
References
[1] G. Colón, M.C. Hidalgo, J.A. Navío, Appl. Catal. A 231, 185(2002). [ Links ]
[2] K.M. Reddy, S.V. Manorama, A.R. Reddy, Mater. Chem. Phys. 78, 239(2002). [ Links ]
[3] J.G. Yu, J.C. Yu, B. Cheng, S.K. Hark, K. Iu, J. Sol. State Chem. 174, 372(2003). [ Links ]
[4] J. Zhang, T. Ayusawa, M. Minagawa, K. Kinugawa, H. Yamashita, M. Matsuoka, M. Anpo, J. Catal. 198, 1(2001). [ Links ]
[5] D.S. Bhatkhande, V.G. Pangarkar, A.A.C.M. Beenackers, J. Chem. Technol. Biot. 77, 102(2002). [ Links ]
[6] S. Malato, J. Blanco, A. Vidal, D. Alarcon, M.I. Maldonado, J. Caceres, W. Gernjak, Solar Energy 75, 329(2003). [ Links ]
[7] N.L. Stock, J. Peller, K. Vinodgopal, P.V. Kamat, Environ. Sci. Technol. 34, 1747(2000). [ Links ]
[8] L.B. Khalil, M.W. Rophael, W.E. Mourad, Appl. Catal. B-Environ. 36, 125(2002). [ Links ]
[9] M.M. Higarashi, W.E. Jardim, Catal. Today 76, 201(2002). [ Links ]
[10] J. Zhao, X.D. Yang, Building and Environ. 38, 645(2003). [ Links ]
[11] H.D. Jang, S.K. Kim, S.J. Kim, J. Nanopart. Res. 3, 141(2001). [ Links ]
[12] Scaflani, L. Palmisano, M. Schiavello, J. Phys. Chem. 94, 829(1990). [ Links ]
[13] Y.F. Gao, Y. Masuda, Z.F. Peng, T. Yonezawa, K. Koumoto, J. Mater. Chem. 13, 608(2003). [ Links ]
[14] J.C. Yu , L.Z. Zhang, Z. Zheng, J.C. Zhao, Chem. Mater.15, 2280(2003). [ Links ]
[15] L.Q. Jing, X.J. Sun, W.M. Cai, Z.L. Xu, Y.G. Du, H.G. Fu J. Phys. Chem. Solids 64, 615(2003). [ Links ]
[16] S.D. Mo, W.Y. Ching, Phys. Rev. B 51, 13023(1995). [ Links ]
[17] L. Cao, Z. Gao, S.L. Suib, T.N. Obee, S.O. Hay, J.D. Freihaut, J. Catal. 196, 253(2000). [ Links ]
[18] A.J. Maira, J.M. Coronado, V. Augugliaro, K.L. Yeung, J.C. Conesa, J. Soria, J. Catal. 202, 413(2001). [ Links ]
Received: December 18, 2004; Accepted: February 26, 2005
This is an open-access article distributed under the terms of the Creative Commons Attribution License
