Photoelectrochemical and EPR features of polymeric C 3 N 4 and O-modified C 3 N 4 employed for selective photocatalytic oxidation of alcohols to aldehydes
| Autor: | Vlasta Brezová, Leonardo Palmisano, Igor Krivtsov, Francesca Rita Pomilla, Giuseppe Marcì, Zuzana Barbieriková, Andrea Zaffora, Monica Santamaria, Marina Ilkaeva, Elisa I. García-López |
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| Přispěvatelé: | Marci, G, Garcia-Lopez, E, Pomilla, F, Palmisano, L, Zaffora, A, Santamaria, M, Krivtsov, I, Ilkaeva, M, Barbierikova, Z, Brezova, V, Marci G., Garcia-Lopez E.I., Pomilla F.R., Palmisano L., Zaffora A., Santamaria M., Krivtsov I., Ilkaeva M., Barbierikova Z., Brezova V. |
| Rok vydání: | 2019 |
| Předmět: |
O-modified C
02 engineering and technology 010402 general chemistry Photochemistry 01 natural sciences Peroxide Catalysis C3N4 chemistry.chemical_compound Photocatalytic partial oxidation Aromatic alcohol Partial oxidation carbon nitride 5-hydroxymethylfurfural Chemistry 5-hydroxymethylfurfural Aromatic alcohol C3N4 carbon nitride EPR O-modified C3N4 Photocatalytic partial oxidation Selective photo-oxidation Photoconductivity O-modified C3N4 Prepared Material General Chemistry 021001 nanoscience & nanotechnology Selective photo-oxidation 0104 chemical sciences Alcohol oxidation Photocatalysis Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie EPR 0210 nano-technology Selectivity |
| Zdroj: | Scopus RUO. Repositorio Institucional de la Universidad de Oviedo instname RUO: Repositorio Institucional de la Universidad de Oviedo Universidad de Oviedo (UNIOVI) |
| Popis: | Four different C 3 N 4 specimens have been prepared, a bulk one (MCN), a thermally etched (MCN-TE), a solid prepared by hydrothermally treating MCN with H 2 O 2 (MCN-H 2 O 2 ) and a polymeric carbon nitride-hydrogen peroxide adduct (MCN-TE-H 2 O 2 ). The principal aim of this work was to correlate the capability of the prepared material to generate reactive oxygen species (ROS), under irradiation, with their photocatalytic activities in terms of conversion and selectivity for partial oxidation reactions. Photoelectrochemical studies revealed that MCN-TE represented the best material in terms of photoconductivity, whereas MCN-H 2 O 2 was defective and evidenced a poor mobility of carriers. EPR studies showed a maximum generation of reactive oxygen species irradiating the MCN-TE sample. The photocatalytic activity of these materials in the selective oxidation of three different alcohols to the corresponding aldehydes, both under UV and natural solar light, showed that the highest conversion was obtained in the presence of the MCN-TE sample, whereas the most selective one was MCN-TE-H 2 O 2 . Under solar light irradiation the performances of the powders were generally better than those under UV light. The characterization of the C 3 N 4 -based materials well justified their photocatalytic activity. The pristine C 3 N 4 materials were more active but less selective than those prepared in the presence of H 2 O 2 . |
| Databáze: | OpenAIRE |
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