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RESEARCH PRODUCT
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
Vlasta BrezováLeonardo PalmisanoIgor KrivtsovIgor KrivtsovFrancesca Rita PomillaGiuseppe MarcìZuzana BarbierikováAndrea ZafforaMonica SantamariaMarina IlkaevaElisa I. García-lópezsubject
O-modified C3402 engineering and technology010402 general chemistryPhotochemistry01 natural sciencesPeroxideCatalysisC3N4Catalysischemistry.chemical_compoundPhotocatalytic partial oxidationCAromatic alcoholPartial oxidationcarbon nitride5-hydroxymethylfurfuralChemistry5-hydroxymethylfurfural Aromatic alcohol C3N4 carbon nitride EPR O-modified C3N4 Photocatalytic partial oxidation Selective photo-oxidationPhotoconductivityO-modified C3N4Prepared MaterialGeneral ChemistryN021001 nanoscience & nanotechnologySelective photo-oxidation0104 chemical sciencesAlcohol oxidationPhotocatalysisSettore CHIM/07 - Fondamenti Chimici Delle TecnologieEPR0210 nano-technologySelectivitydescription
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 .
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-05-01 |