Towards the photocatalytic production of cinnamaldehyde with phosphorous-tailored graphitic-like carbon nitride
Metadatos
Mostrar el registro completo del ítemAutor
Quintana, María Alejandra; Picón, Alba; Martín Lara, María Ángeles; Calero De Hoces, Francisca Mónica; Muñoz Batista, Mario Jesús; Rodríguez Solís, RafaelEditorial
Elsevier
Materia
Graphitic carbon nitride Phosphorous Photocatalysis Cinnamaldehyde
Fecha
2024-02-07Referencia bibliográfica
María Alejandra Quintana, Alba Picón, María Ángeles Martín-Lara, Mónica Calero, Mario J. Muñoz-Batista, Rafael R. Solís, Towards the photocatalytic production of cinnamaldehyde with phosphorous-tailored graphitic-like carbon nitride, Applied Catalysis A: General, Volume 674, 2024, 119607, ISSN 0926-860X, https://doi.org/10.1016/j.apcata.2024.119607. (https://www.sciencedirect.com/science/article/pii/S0926860X24000516)
Patrocinador
University of Granada - “Precompetitive Research Projects” PPJIA2019-09 and PPJIA2021-34 grantsResumen
Photocatalysis has emerged as an environmentally friendly technology to develop selective reactions such as the
oxidation of alcohol to aldehydes. Graphitic carbon nitride (CN) is a metal-free polymeric structure easily
photoactivated under radiation. This work focuses on the enhancement of the photocatalytic activity of bare CN
by doping it with phosphorous (P-CN). Different doping levels of P (2–12 wt.) have been explored and the
samples were fully characterized by XRD, FTIR, N2 physisorption, elemental analysis, XPS, DRS-UV–visible, and
photoluminescence. A better activity and enhanced selectivity were observed in the P-CN samples if compared to
the undoped CN in the oxidation of cinnamyl alcohol to cinnamaldehyde in aqueous solution. The presence of P
was demonstrated to contribute to a better delocalization of photo-generated charges. Moreover, the reactivity
and selectivity of the CN and P-CN samples were analyzed in water-acetonitrile mixtures, appreciating a better
selectivity in the presence of acetonitrile to the detriment of the conversion of the cinnamyl alcohol. The photocatalytic
oxidation mechanism over P-CN in aqueous media has been tentatively proposed based on the influence
of the reactive oxidative species generated in the process by chemical scavenger tests. They suggested the
contribution of superoxide radicals with more selectivity than the photo-generated holes, the second reactive
species of importance in the overall oxidation scheme. The contribution of hydroxyl radicals was discharged
since its presence was negligible in a probe test based on the formation of 2-hydroxy-terephthalic acid.