The photocatalytic approach is known to be one of the most promising advanced oxidation processes for the tertiary treatment of polluted water. In this paper, beta-NaYF4/TiO2 composite films have been synthetized through a novel sol-gel/spin-coating approach using a mixture of beta-diketonate complexes of Na and Y, and Yb3+, Tm3+, Gd3+, Eu3+ as doping ions, together with the TiO2 P25 nanoparticles. The herein pioneering approach represents an easy, straightforward and industrially appealing method for the fabrication of doped beta-NaYF4/TiO2 composites. The effect of the doped beta-NaYF4 phase on the photocatalytic activity of TiO2 for the degradation of methylene blue (MB) has been deeply investigated. In particular, the upconverting TiO2/beta-NaYF4: 20%Yb, 2% Gd, x% Tm (x = 0.5 and 1%) and the downshifting TiO2/beta-NaYF4: 10% Eu composite films have been tested on MB degradation both under UV and visible light irradiation. An improvement up to 42.4% in the degradation of MB has been observed for the TiO2/beta-NaYF4: 10% Eu system after 240 min of UV irradiation.

Synthesis, characterization and photocatalytic properties of nanostructured lanthanide doped beta-NaYF4/TiO2 composite films

Mezzalira, C;Speghini, A;
2022

Abstract

The photocatalytic approach is known to be one of the most promising advanced oxidation processes for the tertiary treatment of polluted water. In this paper, beta-NaYF4/TiO2 composite films have been synthetized through a novel sol-gel/spin-coating approach using a mixture of beta-diketonate complexes of Na and Y, and Yb3+, Tm3+, Gd3+, Eu3+ as doping ions, together with the TiO2 P25 nanoparticles. The herein pioneering approach represents an easy, straightforward and industrially appealing method for the fabrication of doped beta-NaYF4/TiO2 composites. The effect of the doped beta-NaYF4 phase on the photocatalytic activity of TiO2 for the degradation of methylene blue (MB) has been deeply investigated. In particular, the upconverting TiO2/beta-NaYF4: 20%Yb, 2% Gd, x% Tm (x = 0.5 and 1%) and the downshifting TiO2/beta-NaYF4: 10% Eu composite films have been tested on MB degradation both under UV and visible light irradiation. An improvement up to 42.4% in the degradation of MB has been observed for the TiO2/beta-NaYF4: 10% Eu system after 240 min of UV irradiation.
UPCONVERSIONS, ITHIN-FILMS, NANOPARTICLES, PHOTODEGRADATION, CONTAMINANTS
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11562/1078329
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