resumo
Photocatalysis with TiO2 is one of the most promising methods for combatting environmental pollution. Of commercially available photocatalysts, Evonik Aeroxide (formerly Degussa) P25 (R) titania is probably the most extensively used. In this communication, we quantitatively characterise the full phase composition (both crystalline and amorphous content) of P25, as well as the microstructure of individual phases (crystalline domain size distribution and dislocation density). This was achieved with advanced X-ray diffraction (XRD) methods: Rietveld-RIR and whole powder pattern modelling (WPPM). Quantitative phase analysis (QPA) showed the precise composition of P25 to be 76.3 wt% anatase, 10.6 wt % rutile and 13.0 wt% amorphous, and microstructural details are given for the two crystalline phases. (C) 2014 Elsevier B.V. All rights reserved.
palavras-chave
DEGUSSA P25; MICROSTRUCTURAL CHARACTERIZATION; PHOTOCATALYTIC DEGRADATION; TITANIA; RUTILE; ANATASE; ACID
categoria
Materials Science; Physics
autores
Tobaldi, DM; Pullar, RC; Seabra, MP; Labrincha, JA
nossos autores
David Maria Tobaldi
Investigador
João António Labrincha Baptista
Professor Catedrático
Maria Paula Seabra
Professor Auxiliar
Rob Pullar
Colaboradoragradecimentos
D.M. Tobaldi is grateful to the ECO-SEE project (European Union's Seventh Framework Programme funding, grant agreement no 609234). Authors acknowledge PEstC/CTM/LA0011/2013; M.P. Seabra and R.C. Pullar wish to thank the FCT Ciencia2008 programme for supporting this work.