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Volume 11
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10.3390/catal11030349
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Article

Comparative Photo-Electrochemical and Photocatalytic Studies with Nanosized TiO2 Photocatalysts towards Organic Pollutants Oxidation

by
Damián Monllor-Satoca
1,
Pedro Bonete
1,*,
Ridha Djellabi
2,3,
Giuseppina Cerrato
4,
Lorenza Operti
4,
Roberto Gómez
1 and
Claudia Letizia Bianchi
2,3,*
1
Institut Universitari d’Electroquímica i Departament de Química Física, Universitat d’Alacant, Apartat 99, E-03080 Alacant, Spain
2
Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133 Milano, Italy
3
Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali (INSTM), via Giusti 9, 50121 Firenze, Italy
4
Dipartimento di Chimica & NIS Centre of Excellence, Università degli Studi di Torino, via Giuria 7, 10125 Torino, Italy
*
Authors to whom correspondence should be addressed.
Catalysts 2021, 11(3), 349; https://doi.org/10.3390/catal11030349
Submission received: 17 February 2021 / Revised: 1 March 2021 / Accepted: 2 March 2021 / Published: 9 March 2021
(This article belongs to the Special Issue TiO2-Based Materials for (Photo)Catalysis)
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Abstract

The size of TiO2 can significantly affect both its photocatalytic and photo-electrochemical properties, thus altering the photooxidation of organic pollutants in air or water. In this work, we give an account of the photo-electrochemical and photocatalytic features of some nanosized TiO2 commercial powders towards a model reaction, the photooxidation of acetone. Cyclic voltammograms (CV) of TiO2 particulate electrodes under UV illumination experiments were carried out in either saturated O2 or N2 solutions for a direct correlation with the photocatalytic process. In addition, the effect of different reaction conditions on the photocatalytic efficiency under UV light in both aqueous and gaseous phases was also investigated. CV curves with the addition of acetone under UV light showed a negative shift of the photocurrent onset, confirming the efficient transfer of photoproduced reactive oxygen species (ROSs), e.g., hydroxyl radicals or holes to acetone molecules. The photocatalytic experiments showed that the two nano-sized samples exhibit the best photocatalytic performance. The different photoactivity of the larger-sized samples is probably attributed to their morphological differences, affecting both the amount and distribution of free ROSs involved in the photooxidation reaction. Finally, a direct correlation between the photocatalytic measurements in gas phase and the photo-electrochemical measurements in aqueous phase is given, thus evincing the important role of the substrate-surface interaction with similar acetone concentrations.
Keywords: nanosized TiO2; photocatalytic efficiency; photo-electrochemical characterization; environmental remediation nanosized TiO2; photocatalytic efficiency; photo-electrochemical characterization; environmental remediation

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MDPI and ACS Style

Monllor-Satoca, D.; Bonete, P.; Djellabi, R.; Cerrato, G.; Operti, L.; Gómez, R.; Bianchi, C.L. Comparative Photo-Electrochemical and Photocatalytic Studies with Nanosized TiO2 Photocatalysts towards Organic Pollutants Oxidation. Catalysts 2021, 11, 349. https://doi.org/10.3390/catal11030349

AMA Style

Monllor-Satoca D, Bonete P, Djellabi R, Cerrato G, Operti L, Gómez R, Bianchi CL. Comparative Photo-Electrochemical and Photocatalytic Studies with Nanosized TiO2 Photocatalysts towards Organic Pollutants Oxidation. Catalysts. 2021; 11(3):349. https://doi.org/10.3390/catal11030349

Chicago/Turabian Style

Monllor-Satoca, Damián, Pedro Bonete, Ridha Djellabi, Giuseppina Cerrato, Lorenza Operti, Roberto Gómez, and Claudia Letizia Bianchi. 2021. "Comparative Photo-Electrochemical and Photocatalytic Studies with Nanosized TiO2 Photocatalysts towards Organic Pollutants Oxidation" Catalysts 11, no. 3: 349. https://doi.org/10.3390/catal11030349

APA Style

Monllor-Satoca, D., Bonete, P., Djellabi, R., Cerrato, G., Operti, L., Gómez, R., & Bianchi, C. L. (2021). Comparative Photo-Electrochemical and Photocatalytic Studies with Nanosized TiO2 Photocatalysts towards Organic Pollutants Oxidation. Catalysts, 11(3), 349. https://doi.org/10.3390/catal11030349

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