Tailoring Photocatalytic Activity of TiO2 Nanosheets by 57Fe

0523889 - ÚACH 2021 RIV US eng J - Článek v odborném periodiku
Volfová, Lenka - Pližingrová, Eva - Ecorchard, Petra - Motlochová, Monika - Klementová, M. - Jánošíková, Petra - Bezdička, Petr - Kupčík, Jaroslav - Krýsa, J. - Lančok, A. - Šubrt, Jan
Tailoring Photocatalytic Activity of TiO2 Nanosheets by 57Fe.
Journal of Physical Chemistry C. Roč. 124, č. 12 (2020), s. 6669-6682. ISSN 1932-7447. E-ISSN 1932-7455
Grant CEP: GA ČR(CZ) GA18-15613S; GA MŠMT(CZ) LM2015073
Institucionální podpora: RVO:61388980
Klíčová slova: lyophilized aqueous colloids * sol-gel synthesis * doped TiO2 * heterogeneous photocatalysis
Obor OECD: Inorganic and nuclear chemistry
Impakt faktor: 4.126, rok: 2020
Způsob publikování: Omezený přístup
https://pubs.acs.org/doi/10.1021/acs.jpcc.9b11781

TiO2 nanosheets were modified by two different procedures (volume and surface modification) with 0.5 wt % of 57Fe toward Ti. In the case of volume modification, the 57Fe (in the form of 57Fe(NO3)3.nH2O solution) was added at the beginning of preparation of TiO2 nanosheets while the surface modified sample was prepared from the aqueous suspension of undoped TiO2 nanosheets annealed at 800 °C and solution of 57Fe(NO3)3.nH2O via impregnation method. The volume modified sample was later annealed at 650, 800, and 950 °C, no further annealing was done on the surface modified sample. Both types of prepared materials were characterized by electron microscopy, X-ray powder diffraction, surface and porosity measurements, thermal analysis, FTIR and Raman spectroscopies, and Mössbauer spectroscopy. Photocatalytic activity was characterized from the results of 4-chlorophenol (4-CP) decomposition. The surface modified sample exhibited highly effective photocatalytic decomposition of a model pollutant under UV irradiation. On the other hand, the volume modification proved to suppress photocatalytic activity under UV. The visible light activity of 4-CP decomposition was negligible for both volume and surface modified samples. Mössbauer spectroscopy measurements confirmed the presence of iron atoms in the TiO2 structure. The surroundings of the iron atoms exhibit a structure close to that of mixed oxides (Fe1-xTi2-xO5 and Fe2-xTixO3) in solid solution.
Trvalý link: http://hdl.handle.net/11104/0308173