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Photocatalytic evaluation and characterization of TiO2-riboflavin phosphate film: analysis of reactive oxygen species

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Abstract

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.

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Acknowledgements

J.E.N. acknowledges Jimena S. Tuninetti and the Soft Matter Laboratory (INIFTA) for their help and discussion regarding thermogravimetric experiments. We are grateful to Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT), Agencia Córdoba Ciencia (ACC), Secretaría de Ciencia y Técnica of Universidad Nacional de Río Cuarto (SECyT UNRC) and Secretaría de Ciencia y Técnica of Universidad Nacional de San Luis (SECyT UNSL), all from Argentina, for financial support.

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Authors and Affiliations

  1. 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

    David Possetto, Eduardo Gatica, Walter Massad & José Natera

  2. Departamento de Estudios Básicos y Agropecuarios–FAV-UNRC, Rio Cuarto, Argentina

    David Possetto, Eduardo Gatica & José Natera

  3. Instituto de Química de San Luis “Dr. Roberto Antonio Olsina” (INQUISAL) Centro Científico Tecnológico CONICET-San Luis, Rio Cuarto, Argentina

    Carolina Gambetta & María P. Montaña

  4. 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

    Gabriela V. Porcal

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  1. David Possetto
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  2. Carolina Gambetta
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Possetto, D., Gambetta, C., Gatica, E. et al. Photocatalytic evaluation and characterization of TiO2-riboflavin phosphate film: analysis of reactive oxygen species. Photochem Photobiol Sci 22, 513–524 (2023). https://doi.org/10.1007/s43630-022-00331-y

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