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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Towards a higher photostability of ZnO photo-electrocatalysts in the degradation of organics by using MMO substrates

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Author(s):
Goulart, Lorena A. [1, 2] ; Santos, Gessica O. S. [2, 3] ; Eguiluz, Katlin I. B. [3, 4] ; Salazar-Banda, Giancarlo R. [3, 4] ; Lanza, V, Marcos R. ; Saez, Cristina [2] ; Rodrigo, Manuel A. [2]
Total Authors: 7
Affiliation:
[1] V, Univ Sao Paulo, Inst Chem Sao Carlos, POB 780, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Castilla La Mancha, Dept Chem Engn, Campus Univ S-N, Ciudad Real 13071 - Spain
[3] Univ Tiradentes, Proc Engn Postgrad PEP, BR-49037580 Aracaju, SE - Brazil
[4] Res & Technol Inst ITP, Electrochem & Nanotechnol Lab, Aracaju, SE - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Chemosphere; v. 271, MAY 2021.
Web of Science Citations: 0
Abstract

In this work, it is proposed a novel strategy to increase the photostability of the ZnO photoelectrocatalyst under prolonged light irradiation, without the addition or deposition of metals and/or semiconductor oxides during their synthesis. This strategy is based on the use of a mixed metal oxide (MMO-Ru0.3Ti0.7O2) coating as the substrate for the electrodeposition of ZnO. To assess it, the electrodeposition of ZnO films on Ti and Ti/MMO substrates and the photoelectrocatalytic activity of these materials for the degradation of the herbicide clopyralid were studied. The results showed that the substrate directly influenced the photo-stability of the ZnO film. Under the incidence of UV light and polarization, the novel Ti/MMO/ZnO electrode showed greater photocurrent stability as compared to Ti/ZnO, which is a very important outcome because the behavior of these electrodes was similar when compared in terms of the degradation of clopyralid. Single electrolysis was not able to degrade efficiently clopyralid at the different potentials studied. However, the irradiation of UV light on the polarized surface of the Ti/ZnO and Ti/MMO/ZnO electrodes increased markedly the degradation rate of clopyralid. A synergistic effect was observed between light and electrode polarization, since the rate of degradation of clopyralid was twice as high in photoelectrocatalysis (PhEC) than in photocatalysis (PhC) and different intermediates were formed. From these results, mechanisms of degradation of clopyralid for the PhC and PhEC systems with the Ti/ZnO and Ti/MMO/ZnO electrodes were presented. Therefore, the Ti/MMO/ZnO electrode could be a cheap and simple alternative to be applied in the efficient photodegradation of organic pollutants, presenting the great advantage of having a facile synthesis and high capacity to work at relatively low potentials. (C) 2020 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 16/08760-2 - Heterojunction of NiO/ZnO and CuO/ZnO applied at the photo electrodegradation of trimethoprim and levofloxacin
Grantee:Lorena Athie Goulart
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 19/04084-0 - Oxide heterojunctions electrodes applied in the photo-electrocatalysis of antibiotics in flow reactors
Grantee:Lorena Athie Goulart
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 14/50945-4 - INCT 2014: National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies
Grantee:Maria Valnice Boldrin
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 17/10118-0 - Study and application of electrochemical technology for the analysis and degradation of endocrine interferents: materials, sensors, processes and scientific dissemination
Grantee:Marcos Roberto de Vasconcelos Lanza
Support Opportunities: Research Projects - Thematic Grants