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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.)

Photoelectrocatalytic treatment of levofloxacin using Ti/MMO/ ZnO electrode

Full text
Author(s):
Goulart, Lorena A. [1, 2] ; Moratalla, Angela [2] ; Lanza, Marcos R. V. [1] ; Saez, Cristina [2] ; Rodrigo, Manuel A. [2]
Total Authors: 5
Affiliation:
[1] 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
Total Affiliations: 2
Document type: Journal article
Source: Chemosphere; v. 284, DEC 2021.
Web of Science Citations: 0
Abstract

Here, the antibiotic levofloxacin (LFX) widely used and detected in the environment was degraded by photoelectrolysis using a new electrode based on zinc oxide (ZnO) and a mixture of mixed oxides of ruthenium and titanium (MMO). The influence of the potential and irradiation of UV light was investigated in the photostability of the Ti/MMO/ZnO electrode and in the degradation of the antibiotic. The experiments were conducted at different pH values (5.0, 7.0 and 9.0) in sodium sulfate solution in a glass reactor with central lighting. It was observed that the new Ti/MMO/ZnO electrode has good stability under light irradiation and potential, presenting excellent photocurrent and high photoactivity in LFX photoelectrolysis. The removal efficiency of the compound was directly related to the formation of oxidizing species in solution, the photo-generated charges on the electrode and the electrostatic characteristics of the molecule. The mineralization rate, the formation of reaction intermediates and short chain carboxylic acids (acetic, maleic, oxalic and oxamic acid), in addition to the formation of N-mineral species (NO3- and NH4+) was dependent on the pH of the solution and the investigated processes: photoelectrolysis was more efficient than photolysis, which, in turn, was more efficient than electrolysis. The synergistic effect and the high rate of degradation of LFX after 4.0 h of treatment (100%) observed in photoelectrolysis at alkaline pH, was associated with the high stability of the Ti/MMO/ZnO electrode at this pH, the photoactivation of sulfate ions and the ease generation of oxidizing radicals, such as center dot OH. (AU)

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
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