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Acetaldehyde Photocatalytic Decomposition over Nanostructured TiO2 Sol-Gel Catalysts
Published online by Cambridge University Press: 01 February 2011
Abstract
TiO2nanoparticles were synthesized by the Sol-Gel method by using 2-propanol as solvent in acid medium (pH1). The samples were annealed at 200 and 500°C and were characterized by BET, XRD-Rietveld refinements, TEM and FTIR. The activity was evaluated by the acetaldehyde photodecomposition in an isolated chamber with an initial concentration of contaminant of 300 ppmv with oxygen (2%) assisted with a 365-nm UV lamp. The test results were compared with those obtained with a commercial catalyst (P25). Improved photoactivity (≍100 % of acetaldehyde in 150 min) was obtained with catalysts annealed at 200°C (TiO2-P-200°C), that showed nanoparticles (≍7 nm) and abundant anatase phase (≍ 63 %) coexist with the brookite phase (≍ 37 %), as well as irregular equiaxial morphology. The samples annealed at 500°C (TiO2-P-500°C), showed an increment in nanoparticles (≍22 nm), different ratio and phase composition (anatase-brookite-rutile), and therefore less activity (≍80 %). This high activity could be explained by the special ratio of anatase-brookite and the dimension of nanometric crystal size. The aforementioned characteristics could be useful in the degradation of reactive organic gases like acetaldehyde either in confined spaces or in the open air.
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References
[1] Kim, C. S., Okuyama, K., Nakaso, K. and Shimada, M., (2004) “Direct Measurement of Nucleation and Growth Modes in Titania Nanoparticles Generation by a CVD Method” J. Chem. Eng. Jpn
37: 1379–1389.Google Scholar
[2] Mergel, D., Buschendorf, D., Eggert, S., Grammes, R., Samset, B., (2000) “Density and refractive index of TiO2 films prepared by reactive evaporation” Thin Solid Films
371: 218–224.Google Scholar
[3] Fujishima, A., Zhang, C.R., (2000) “Titanium dioxide photocatalysis: present situation and future approaches” Chimie
9: 750–760.Google Scholar
[4] Anpo, M., “Utilization of TiO2photocatalysts in green chemistry” (2000) Pure Appl. Chem.
72: 1265–1270.Google Scholar
[5] Hashimoto, K., Irie, H., Fujishima', A. (2005) “TiO2 Photocatalysis: A Historical Overview and Future Prospects” Jap. J. Appl. Phys.
44: 8269–8285.Google Scholar
[6] Ahonen, P.P., Kauppmen, E.I., Journet, J.C., Deschanvres, J.L., Tendeloo, G.J. Van, (1999) “Preparation of nanocrystalline titania powder via aerosol pyrolysis of titanium tetrabutoxide” Mater Res
14: 3938–3948.Google Scholar
[7] Depero, L.E., Marino, A., Allieri, B., Bontempi, E., Sangaletti, L., Casale, C., Notaro, M., (2000) “Morphology and microstructural properties of TiO2 nanopowders doped with trivalent Al and Ga cations” J. Mater. Res.: 2080–2086.Google Scholar
[8] Yang, J., Mei, S., Ferreira, J.M.F., (2001) “Hydrothermal synthesis of nanosized titania powders: influence of tetraalkyl ammonium hydroxides on particle characteristics” J. Amer. Ceram. Soc.
84:1696–1702.Google Scholar
[9] Mayadevi, S., Kulkarni, S.S., Patil, A.J., Shinde, M.H., Potdar, H.S., Deshpande, S.B., Date, S. K., (2000) “Chemically precipitated titania for membrane applications – effect of heat treatment and fabrication conditions on its performance” J. Mater. Sci. 35: 3943–3949.Google Scholar
[10] Zhu, Y. H., Zhang, L., Gao, C., Cao, L., (2000) “The synthesis of nanosized TiO2 powder using a sol-gel method with TiCl4 as a precursor” J. Mat. Sci.
35: 4049–4054.Google Scholar
[11] Nakagawa, Y., Grigoriu, C., Masugata, K., Jiang, W., Yatsui, K. (1998) “Synthesis of TiO2 and TiN nanosize powders by intense light ion-beam evaporation” J. Mater. Sci.
33: 529–533.Google Scholar
[12] Zhang, Y. H., Chan, C.K., Porter, J.F., Guo, W., (1998) “Micro-Raman spectroscopic characterization of nano-sized TiO2 powders prepared by vapor hydrolysis” J. Mater. Res.
13: 2602–2609.Google Scholar
[13] Cao, L., Gao, Z., Suib, S.L., Obee, T.N., Steven, O.H., Freihaut, J.D., (2000) “Photocatalytic Oxidation of Toluene on Nanoscale TiO2 Catalysts: Studies of Deactivation and Regeneration” J Catal
196: 253–261.Google Scholar
[14] Benoit-Marquie, F., Wilkenhoner, U., Simon, V., Braun, A., Oliveros, E., Maurette, M.T., (2000) “VOC photodegradation at the gas-solid interface of a TiO2 photocatalyst - Part I: 1-butanol and 1-butylamine” J Photochem. and Photobiol. A: Chem
132: 225–232.Google Scholar
[15] Castillo, S., Gómez, R., Morán-Pineda, M., (2003) “Effect of sol-gel derived Al2O3-ZrO2 and Al2O3-TiO2 oxides on the selectivity of NO reduction by CO under oxidizing conditions” React. Kinet. Catal. Lett.
79: 217–279.Google Scholar
[16] Rodríguez-Carbajal, J. (1993) “Determination of the crystallized fractions of a largely amorphous multiphase material by the Rietveld method” J. Phys. B
192: 55–69.Google Scholar
[17] Orlhac, X., Fillet, C., Deniard, P., Dulac, A.M., Brec, R., (2001) “Determination of the crystallized fractions of a largely amorphous multiphase material by the Rietveld method” Appl. Cryst.
34: 114–118.Google Scholar
[18] Fuentes, L., (1998) Análisis de minerales y el método de Rietveld, México, Sociedad Mexicana de Cristalografía, pp.78.Google Scholar
[19] Reid, J.W., Hendry, J.A., (2006) “Rapid, accurate phase quantification of multiphase calcium phosphate materials using Rietveld refinement” Appl. Cryst.
39: 536–543.Google Scholar
[20] Castillo, S., Morán-Pineda, M., Molina, V., Gómez, R., López, T., (1998) “Catalytic reduction of nitric oxide on Pt and Rh catalysts supported on alumina and titania synthesized by the sol-gel method” Appl. Catal. B: Environ
15: 203–209.Google Scholar
[21] Wang, J.A., Cuan, A., Salmones, J., Nava, N., Castillo, S., Morán-Pineda, M., Rojas, F., (2004), “Studies of sol-gel TiO2 and Pt/TiO2 catalysts for NO reduction by Co in a oxygen-rich condition”, Appl. Surf. Sci.
230, 94–105.Google Scholar
[22] Song, S.H., Wang, X., Xiao, P., (2002) “Synthesis of nanosized rutile TiO2 powder at low temperature” Mate.r Chem. Phys.
77: 314–317.Google Scholar
[23] Wang, J.A., Lima-Ballesteros, R., López, T., Moreno, A., Gómez, R., Novaro, O., Bokhimi, X. (2001) “Quantitative determination of titanium lattice defects and solid state reaction mechanism in iron-doped TiO2 photocatalysts” J. Phys. Chem. B
105: 9692–9698.Google Scholar
[24] Ovenstone, J., (2001) “Preparation of novel titania photocatalysts with high activity” J. Mater. Sci.
36: 1325–1329.Google Scholar
[25] Radhica, C., Burtrand, B.
Lee, I., (2007) “Experimental variables in the synthesis of brookite phase TiO2 nanoparticles”, Materials Science and Engineering A,
467, 146–149.Google Scholar
[26] Gribb, A.A., Banfield, J.F., (1997) “Particle size effects on transformation kinetics and phases stability in nanocrystalline TiO2”, Am. Mineral, 82, 717–728.Google Scholar
[27] Zhu, Ke-Rong, Zhang, Ming-Sheng, Hong, Jian-Ming, Yin, Zhen, (2005) “Size effect on phase transition sequence of TiO2 nanocrystal”, Matter. Sci. Eng. A, 403, 87–93.Google Scholar
[28] Diebold, Ulrike, (2003) “The surface science of titanium dioxide”, Surf. Sci. Reports, 48, 53–229.Google Scholar