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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.)

Optimization of the electrochemical degradation process of the antibiotic ciprofloxacin using a double-sided beta-PbO2 anode in a flow reactor: kinetics, identification of oxidation intermediates and toxicity evaluation

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Wachter, Naihara [1] ; Aquino, Jose M. [1] ; Denadai, Marina [1] ; Barreiro, Juliana C. [2] ; Silva, Adilson J. [3] ; Cass, Quezia B. [1] ; Rocha-Filho, Romeu C. [1] ; Bocchi, Nerilso [1]
Total Authors: 8
[1] Univ Fed Sao Carlos, Dept Quim, CP 676, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Sao Paulo, Inst Quim Sao Carlos, Ave Joao Dagnone 1100, BR-13563120 Sao Carlos, SP - Brazil
[3] Univ Fed Sao Carlos, Dept Engn Quim, CP 676, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Environmental Science and Pollution Research; v. 26, n. 5, p. 4438-4449, FEB 2019.
Web of Science Citations: 6

The electrochemical degradation of ciprofloxacin-CIP (50 mg L-1 in 0.10 mol L-1 Na2SO4) was investigated using a double-sided Ti-Pt/beta-PbO2 anode in a filter-press flow reactor, with identification of oxidation intermediates and follow-up of antimicrobial activity against Escherichia coli. The effect of solution pH, flow rate, current density, and temperature on the CIP removal rate was evaluated. All of these parameters did affect the CIP removal performance; thus, optimized electrolysis conditions were further explored: pH = 10, q (V) = 6.5 L min(-1), j = 30 mA cm(-2), and theta = 25 A degrees C. Therefore, CIP was removed within 2 h, whereas similar to 75% of the total organic carbon concentration (TOC) was removed after 5 h and then, the solution no longer presented antimicrobial activity. When the electrochemical degradation of CIP was investigated using a single-sided boron-doped diamond (BDD) anode, its performance in TOC removal was similar to that of the Ti-Pt/beta-PbO2 anode; considering the higher oxidation power of BDD, the surprisingly good comparative performance of the Ti-Pt/beta-PbO2 anode was ascribed to significantly better hydrodynamic conditions attained in the filter-press reactor used with this electrode. Five initial oxidation intermediates were identified by LC-MS/MS and completely removed after 4 h of electrolysis; since they have also been determined in other degradation processes, there must be similarities in the involved oxidation mechanisms. Five terminal oxidation intermediates (acetic, formic, oxamic, propionic, and succinic acids) were identified by LC-UV and all of them (except acetic acid) were removed after 10 h of electrolysis. (AU)

FAPESP's process: 09/54040-8 - Acquisition of a high-resolution Orbitrap mass spectrometer for the discovery and structural analysis of biologically active compounds: applications in proteomics, biomarkers, synthesis, isolation, and characterization of natural products, studies of redox systems in food and enzymatic synthesis
Grantee:Emanuel Carrilho
Support type: Multi-user Equipment Program
FAPESP's process: 09/17138-0 - Methods for quantification of small molecules in biological fluids: the use of restricted access media columns for direct injection of samples
Grantee:Quezia Bezerra Cass
Support type: Regular Research Grants
FAPESP's process: 12/13002-9 - Electrochemical degradation of a pharmaceutical: comparison between anodes
Grantee:Naihara Wachter
Support type: Scholarships in Brazil - Master