Sulfate Ions in Titania Polymorphs View Full Text


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Article Info

DATE

2004-01

AUTHORS

X. Bokhimi, A. Morales, E. Ortíz, T. López, R. Gómez, J. Navarrete

ABSTRACT

Sol-gel titania was sulfated by using sulfuric acid as hydrolysis catalyst, or by impregnating with ammonium sulfate fresh samples prepared with nitric acid or ammonium hydroxide as hydrolysis catalyst. Samples were characterized with X-ray powder diffraction, infrared spectroscopy, thermogravimetry and atomic absorption spectroscopy. Sulfate ions were found anchored to brookite and anatase phases, because they have short O—O atomic bond lengths slightly larger than the largest O—O bond length of sulfate ion. Since the shortest O—O atomic bond in anatase is smaller than the one in brookite, the sulfate ions are then less deformed when they are anchored to anatase, and consequently more stable. Therefore when the sample temperature is raised, the brookite with sulfate ions was transformed mainly to anatase and not into rutile, which is the most probably transformation when these ions are not involved. Sulfate ions also hindered anatase and brookite crystallite growing and stabilized the crystalline structure of anatase. When the sulfate ions are lost the crystalline anatase phase is transformed into rutile, leaving a large number of vacancies that favored atom diffusion and consequently the growing of rutile crystallites. The crystalline evolution of the samples as a function of the annealing temperature is almost independent of the sulfating method. More... »

PAGES

31-40

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/b:jsst.0000016135.02238.0e

DOI

http://dx.doi.org/10.1023/b:jsst.0000016135.02238.0e

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180 grid-institutes:grid.7220.7 schema:alternateName Department of Chemistry, Universidad Autónoma Metropolitana-Iztapalapa, A.P. 55-534, 9340, México D.F., Mexico
181 schema:name Department of Chemistry, Universidad Autónoma Metropolitana-Iztapalapa, A.P. 55-534, 9340, México D.F., Mexico
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183 grid-institutes:grid.9486.3 schema:alternateName Institute of Physics, The National University of Mexico (UNAM), A.P. 20-364, 01000, México D.F., Mexico
184 schema:name Institute of Physics, The National University of Mexico (UNAM), A.P. 20-364, 01000, México D.F., Mexico
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