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2012 | 10 | 4 | 1183-1198
Tytuł artykułu

The effect of anatase crystal morphology on the photocatalytic conversion of NO by TiO2-based nanomaterials

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Hydrogen titanate nanotubes (H-TTNT) were synthesized by the alkali hydrothermal method followed by proton exchange and then submitted either to thermal treatment or to acid hydrothermal reaction to generate TiO2-anatase nanocrystals of different morphologies. The samples were characterized by XRPD, TGA, sulfur analysis, N2 physisorption, UV-Vis spectroscopy and TEM. Their photocatalytic activities were determined by measuring the NO conversion in inert gas stream passed through the powder catalyst bed under UV radiation. Incomplete transformation into anatase resulted in nanomaterials with low activity due to coexistence with H-TTNT or TiO2-B precursors. Anatase specimens derived from H-TTNT aged in strong sulfuric acid media contained equidimensional nanoparticles, but retention of sulfate negatively affected their photocatalytic activity. Combining milder acidic pH with higher aging temperature, allowed synthesis of a sulfate free anatase with the same optical properties and specific surface area as the counterpart produced by calcination of H-TTNT at 550°C; however, the former exhibited truncated bi-pyramid nanocrystals and the other adopted the form of nanorods. This latter showed the highest photocatalytic activity for NO abatement, outperforming the benchmark photocatatyst TiO2-P25; this improved activity was tentatively ascribed to the maximization of high energy {001} facets in anatase nanorods formed during calcination of H-TTNT. [...]
Wydawca

Czasopismo
Rocznik
Tom
10
Numer
4
Strony
1183-1198
Opis fizyczny
Daty
wydano
2012-08-01
online
2012-05-29
Twórcy
autor
  • PETROBRAS S.A. / CENPES, Research & Development Centre, 21941-915, Rio de Janeiro, Brazil
autor
  • Department of Materials and Metallurgy Engineering, Federal University of Rio de Janeiro (UFRJ), 21941-972, Rio de Janeiro, Brazil
  • Department of Materials Engineering, Pontifical Catholic University, Gávea, 22453-900, Rio de Janeiro, Brazil
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11532-012-0040-3
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