Dye decomposition on P25 with enhanced adsorptivity

Autor:	Magdalena Janus, Antoni W. Morawski, Beata Tryba, Beata Wawrzyniak
Rok vydání:	2008
Předmět:	Materials science General Chemical Engineering Chemical structure Pressure reactor General Chemistry Photochemistry Decomposition Catalysis Ammonia chemistry.chemical_compound chemistry Titanium dioxide Photocatalysis Fourier transform infrared spectroscopy Biotechnology
Zdroj:	PJCT. 10:11-16
ISSN:	1899-4741 1509-8117
DOI:	10.2478/v10026-008-0021-7
Popis:	Dye decomposition on P25 with enhanced adsorptivity The preparation method and the activity of the TiO2-P25/N doped photocatalyst based on commercial titanium dioxide (TiO2 Aeroxide® P-25 Degussa, Germany) are presented. For the TiO2-P25/N preparation TiO2-P25 and gaseous ammonia were kept in a pressure reactor (10 bars) for 4 hours at the temperature of 200°C. This modification process changed the chemical structure of the TiO2 surface. The formation of NH4 + groups was confirmed by the FTIR measurements. Two bands in the range of ca. 1430 - 1440 cm-1 attributed to bending vibrations of NH4 + could be observed on the FTIR spectra of the catalysts modified with ammonia and the band attributed to the hydroxyl groups at 3300 - 3500 cm-1, which were not reduced after N-doping. The photocatalytic activity of the photocatalysts was checked through the decomposition of two dyes under visible light irradiation. The modified TiO2 thus prepared samples were more active than TiO2-P25 for the decomposition of dyes under visible light irradiation.
Databáze:	OpenAIRE
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