Sustainable production of value-added chemicals and fuels by using a citric acid-modified carbon nitride optical semiconductor

• Tipo: Artigo em Revista Científica Internacional
• Data: 2021

Autores

Raquel A. Fernandes (Autor) Outra; Sampaio, M.J. (Autor) FEUP; Eliana S. da Silva (Autor) FEUP; Hanane Boumeriame (Autor) FEUP; Tânia Lopes (Autor) FEUP; Luísa Andrade (Autor) FEUP; Adélio Mendes (Autor) FEUP; Joaquim Luís Faria (Autor) FEUP; Cláudia G. Silva (Autor) FEUP

Revista

Título: Applied Catalysis A: General

Vol. 609

Páginas: 1-10

ISSN: 0926-860X

Editora: Elsevier

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 0 Citações

Projetos Associados

LED-NETmix - LED-NETmix: um fotoreator inovador para a intensificação de processos em síntese química

Outras Informações

ID Authenticus: P-00S-ZM0

DOI: 10.1016/j.apcata.2020.117912

Abstract (EN): Citric acid-modified graphite-like carbon nitride materials (GCN-zCA) were synthetized by thermal copolymerization of dicyandiamide with different amounts of citric acid (z = between 5 and 25 mg). The resulting materials presented surface porosity, defective polymeric structure, and enhanced visible light absorption in the 450-700 nm range, attributed to the existence of mid-gap states and n-pi* electronic transitions. All the modified catalysts presented high selectivity (>99 %) towards the conversion of p-anisyl alcohol into p-anisaldehyde under visible-LED irradiation, the best performing photocatalyst (GCN-20CA) reaching 63 % yield (contrasting with 22 % obtained with bulk GCN) after 240 min reaction. GCN-20CA was also applied for hydrogen generation from water splitting. The modified material practically duplicated the hydrogen production when compared to bulk GCN (75 and 44 mu mol H-2 evolved in three hours, respectively), by using platinum nanoparticles as co-catalyst and EDTA as sacrificial electron donor. Moreover, p-anisyl alcohol was successfully used as sacrificial agent for water splitting, with simultaneous production of p-anisaldehyde and H-2. Reusability tests showed that GCN-20CA remained stable in a series of consecutive runs both for p-anisaldehyde synthesis and hydrogen production.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10