Your browser doesn't support javascript.
loading
Photocatalytic evaluation and characterization of TiO2-riboflavin phosphate film: analysis of reactive oxygen species.
Possetto, David; Gambetta, Carolina; Gatica, Eduardo; Montaña, María P; Porcal, Gabriela V; Massad, Walter; Natera, José.
Afiliação
  • Possetto D; Departamento De Química-FCEF-QyN-UNRC, Instituto Para el Desarrollo Agroindustrial y de la Salud (IDAS), CONICET-Universidad Nacional de Río Cuarto (UNRC), Rio Cuarto, Argentina.
  • Gambetta C; Departamento de Estudios Básicos y Agropecuarios-FAV-UNRC, Rio Cuarto, Argentina.
  • Gatica E; Instituto de Química de San Luis "Dr. Roberto Antonio Olsina" (INQUISAL) Centro Científico Tecnológico CONICET-San Luis, Rio Cuarto, Argentina.
  • Montaña MP; Departamento De Química-FCEF-QyN-UNRC, Instituto Para el Desarrollo Agroindustrial y de la Salud (IDAS), CONICET-Universidad Nacional de Río Cuarto (UNRC), Rio Cuarto, Argentina.
  • Porcal GV; Departamento de Estudios Básicos y Agropecuarios-FAV-UNRC, Rio Cuarto, Argentina.
  • Massad W; Instituto de Química de San Luis "Dr. Roberto Antonio Olsina" (INQUISAL) Centro Científico Tecnológico CONICET-San Luis, Rio Cuarto, Argentina.
  • Natera J; Departamento De Química-FCEF-QyN-UNRC, Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados (IITEMA)-Universidad Nacional de Río Cuarto (UNRC), Rio Cuarto, Argentina.
Photochem Photobiol Sci ; 22(3): 513-524, 2023 Mar.
Article em En | MEDLINE | ID: mdl-36308632
The effect of Riboflavin-5'-phosphate (RFPO4) sensitization on photocatalytic properties of TiO2 film was studied. RFPO4 was adsorbed on film surface to investigate the photophysical properties of TiO2 upon blue-light photoexcitation. The film was characterized through scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, thermogravimetric analysis, and diffuse reflectance spectroscopy. The efficiency of the TiO2/RFPO4 film was tested for pollutant elimination in aqueous media in a visible-light-driven system. The phenol paradigmatic model was employed in an aqueous solution as a contaminant target. TiO2/RFPO4 sensitized photodegradation of phenol, which produces catechol, hydroquinone, and benzophenone, was monitored by absorption spectroscopy and HPLC. The results indicated that phenol degradation with TiO2/RFPO4 film was due to the photogeneration of two reactive oxygen species, singlet molecular oxygen (O2(1Δg)) and superoxide radical anion (O2·-) identified through specific detection techniques. The presence of O2(1Δg) is reported here for the first time as generated from a sensitized TiO2 film upon visible-light photoirradiation. Based on the photophysical determinations, a photocatalytic mechanism for TiO2/RFPO4 was established.
Palavras-chave

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Photochem Photobiol Sci Assunto da revista: BIOLOGIA / QUIMICA Ano de publicação: 2023 Tipo de documento: Article País de afiliação: Argentina País de publicação: Reino Unido

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Photochem Photobiol Sci Assunto da revista: BIOLOGIA / QUIMICA Ano de publicação: 2023 Tipo de documento: Article País de afiliação: Argentina País de publicação: Reino Unido