Heterogeneous riboflavin-based photocatalyst for pollutant oxidation through electron transfer processes

[Display omitted] •SiO2-RF is a novel, robust and recyclable organic heterogeneous photocatalyst.•Photostability of SiO2-RF is enhanced due to the lack of 1O2 generation.•High adsorption of aqueous organic pollutants to the surface of SiO2-RF occurs.•SiO2-1RF* produces oxidation of pollutants throug...

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Veröffentlicht in:Applied catalysis. B, Environmental Environmental, 2021-12, Vol.298, p.120497, Article 120497
Hauptverfasser: Cabezuelo, Oscar, Martinez-Haya, Rebeca, Montes, Noelia, Bosca, Francisco, Marin, M. Luisa
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Sprache:eng
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Zusammenfassung:[Display omitted] •SiO2-RF is a novel, robust and recyclable organic heterogeneous photocatalyst.•Photostability of SiO2-RF is enhanced due to the lack of 1O2 generation.•High adsorption of aqueous organic pollutants to the surface of SiO2-RF occurs.•SiO2-1RF* produces oxidation of pollutants through electron transfer mechanism. Organic photocatalysts could employ visible light to produce photodegradation of pollutants; however, their low photostability prevents their reuse even when they are supported on solid materials. Herein, to obtain a Riboflavin (RF)-based photocatalyst robust and recyclable, RF has been covalently anchored to silica particles, converting the known homogeneous photocatalyst into a new heterogeneous one (SiO2-RF). To enhance the photostability of SiO2-RF, generation of the RF triplet excited state and subsequent singlet oxygen were prevented by ensuring a complete shell of RF moieties on the silica spheres. Moreover, adsorption of organic pollutants such as phenol, ortho-phenylphenol, 2,4,6-trichlorophenol and pentachlorophenol on the surface of SiO2-RF is favored in aqueous media, facilitating electron transfer from the pollutants to the short-lived first singlet excited state of RF. Photophysical measurements provided evidence on the photocatalytic mechanism for SiO2-RF.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2021.120497