Photoelectrochemical and EPR features of polymeric C3N4 and O-modified C3N4 employed for selective photocatalytic oxidation of alcohols to aldehydes

Elisa Isabel Garcia Lopez, Giuseppe Marci', Andrea Zaffora, Leonardo Palmisano, Monica Santamaria, Zuzana Barbieriková, Krivtsov, Ilkaeva, Vlasta Brezová, Francesca Rita Pomilla

Risultato della ricerca: Articlepeer review

12 Citazioni (Scopus)

Abstract

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 .
Lingua originaleEnglish
pagine (da-a)21-28
Numero di pagine8
RivistaCatalysis Today
Volume328
Stato di pubblicazionePublished - 2019

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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