Synthesis and characterization of efficient TiO2 mesoporous photocatalysts

resumo

Mesoporous TiO2 powder with large surface area and high porosity was prepared via template-free method of heat-stimulated oxidizing destruction of TiC by HNO3. Anatase crystalline phase of as-prepared and annealed at 200-400 degrees C titania was confirmed by XRD technique. Surface nitrate-nitro groups responsible for high adsorption capacity of the TiO2 powders were studied by FTIR spectroscopy. The annealing temperature can be used as a factor for regulation of titania morphology and structural properties. The rise in the annealing temperature higher than the temperature of nitrate-nitro groups decomposition induces the growth of TiO2 crystallites, decreasing porosity and surface area, the drop of adsorption capacity, and improving photocatalytic activity under UV irradiation. (C) 2016 Elsevier Ltd. All rights reserved.

palavras-chave

TITANIUM-DIOXIDE MATERIALS; HETEROGENEOUS PHOTOCATALYSIS; FUNDAMENTALS; CALCINATION; MECHANISMS; FRAMEWORK; POROSITY; ROUTE; ACID

autores

Ovodok, E; Maltanava, H; Poznyak, S; Ivanovskaya, M; Kudlash, A; Scharnagl, N; Tedim, J

nossos autores

agradecimentos

We gratefully acknowledge the financial support of the European Commission (Project: 645662 - SMARCOAT H2020-MSCA-RISE-2014) for this research.

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