Exceptional thermal stability of undoped anatase TiO2 photocatalysts prepared by a solvent-exchange method
authors Krivtsov, I; Ilkaeva, M; Avdin, V; Amghouz, Z; Khainakov, SA; Garcia, JR; Diaz, E; Ordonez, S
nationality International
journal RSC ADVANCES
keywords TITANIUM-DIOXIDE NANOMATERIALS; PHASE-STABILITY; NANOPARTICLES; RUTILE; SOL; TRANSFORMATION; NANOCRYSTALS; FEATURES; OXIDES; FILMS
abstract A new solvent-exchange technique to prepare anatase nanoparticles with exceptional thermal stability and photocatalytic activity is described here. The process of preparation is accomplished by using organic solvents to precipitate hydrous titania particles from a basic aqueous medium containing a titanium peroxo complex. Undoped titanium dioxide formed via a solvent exchange method has unprecedented thermal stability against transformation to the rutile phase, as opposed to TiO2 prepared by the common method of the gelation of an aqueous titanium peroxo complex. On the basis of X-ray thermodiffraction experiments, it has been established that the thermal treatment at 1000 degrees C of the titania prepared by ethanol precipitation contains 100% pure anatase phase. The stabilization of anatase is induced by the high defectiveness of the TiO2 nanostructure, which is evidenced from band-gap energy estimation, PXRD and HRTEM studies. The prepared TiO2 nanoparticles show an outstanding photocatalytic activity comparable to the commercial Aeroxide P25 photocatalyst in the UV-assisted decomposition of methylene blue.
publisher ROYAL SOC CHEMISTRY
issn 2046-2069
year published 2015
volume 5
issue 46
beginning page 36634
ending page 36641
digital object identifier (doi) 10.1039/c5ra01114k
web of science category Chemistry, Multidisciplinary
subject category Chemistry
unique article identifier WOS:000353651200048
link https://pubs.rsc.org/en/Content/ArticleLanding/2015/RA/C5RA01114K#!divAbstract
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