High efficiency of graphene/CoFe₂O₄ nanomaterial in the photocatalytic conversion of CO₂ dissolved in water under solar irradiation simulator

Autor(es)

dos Santos, Clecia Andrade ; Perini, Joao Angelo Lima ; Irikura, Kallyni ; Romao, Luciane Pimenta Cruz ; Zanoni, Maria V. Boldrin

• Tipo de documento: Artigo Científico
• Fonte: Journal of Materials Science; v. 59, n. 4, p. 16-pg., 2024-01-01.

Resumo

The present work describes the excellent performance of GH-CoFe2O4 photocatalysts based on graphene ferrite, synthesized using water rich in natural organic matter (NOM) as a solvent, for the photocatalytic reduction of CO2 under artificial visible light, at ambient temperature and pressure. The nano-photocatalysts presented excellent photocatalytic activity, with high selectivity towards the conversion of CO2 to methanol as the main product, for both semiconductors tested (CoFe2O4 and GH-CoFe2O4). The presence of graphene improved photoexcitation under visible light, decreasing the CoFe2O4 band gap value from 1.47 to 1.25 eV, resulting in decreased recombination of the e-/h+ pairs. The rates of formation of methanol were 1105.7 and 1389.9 mu mol g(-1) h(-1) for CoFe2O4 and GH-CoFe2O4, respectively. The findings reveal the potential of photocatalysts based on ferrite and graphene for use in the conversion of CO2 dissolved in water without any added chemical into high added-value products. (AU)

• Processo FAPESP: 17/12790-7 - Preparação e caracterização de eletrodos nanoestruturados de TiO2 modificados com estruturas metal orgânico (MOFs) para a aplicação na pré-concentração e redução de CO2
• Beneficiário: Kallyni Irikura
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 16/18057-7 - Redução de CO2 visando à geração de compostos de valor agregado por fotocatálise/fotoeletrocatálise utilizando líquido iônico em reator pressurizado
• Beneficiário: João Angelo de Lima Perini
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 14/50945-4 - INCT 2014: Instituto Nacional de Tecnologias Alternativas para Detecção, Avaliação Toxicológica e Remoção de Micropoluentes e Radioativos
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Temático