Electro-oxidation of amoxicillin using titanium electrodes electrophoretically coated by iridium or ruthenium with tantalum oxides

• Main Authors: Bustos, E. (Author), Cárdenas, J. (Author), Gomes, H. (Author), León, I. (Author), Manríquez, J. (Author), Rivera, F. (Author), Sepúlveda-Guzmán, S. (Author)
• Format: Article
• Language: English
• Published: John Wiley and Sons Ltd 2021
• Subjects: amoxicillin; antimicrobial resistan; cetransition metal oxides; modified surface; selectrochemical advanced oxidation processes; Article; Chemical industry; chemical oxygen demand; Chemical oxygen demand; controlled study; Current efficiency; degradation; Degradation; drug coating; Electrodes; Electrooxidation; electrophoresis; energy consumption; Free radicals; high performance liquid chromatography; hydroxyl radical; Hydroxyl radicals; In-situ production; iridium; Modified surfaces; oxidation; Oxidation; pH; Pharmaceutical compounds; ruthenium; Ruthenium compounds; simulation; Sodium sulfate; surface area; tantalum; Tantalum oxides; Technological alternatives; titanium; Titanium; Titanium electrodes; Titanium oxides; Transition metal oxides; ultraviolet visible spectroscopy; waste component removal; Wastewater decontamination
• Online Access: View Fulltext in Publisher
• ISBN: 02682575 (ISSN)
• DOI: 10.1002/jctb.6575

BACKGROUND: Amoxicillin (AMX) is one of the pharmaceutical compounds in waters being targeted in wastewater decontamination studies, and some of the technological alternatives to degrade it involve using modified surfaces with transition metal oxides, such as IrO2/Ta2O5|Ti and RuO2/Ta2O5|Ti, for in situ production of hydroxyl radical (•OH) to oxidize AMX in aqueous media. RESULTS: The IrO2/Ta2O5|Ti 70:30 electrode was best suited for AMX electro-oxidation, with 99.23% removal measured by HPLC-UV–Vis, 81.13% by COD removal, and current efficiency of 41.1% in 0.1 mol L–1 Na2SO4 after applying 15 mA for 6 h. These results are due to a larger surface area (251.67 cm2) and a higher amount of •OH radicals being generated by cm2 in neutral pH (3.8 mol L–1 cm−2) compared to the other electrodes. CONCLUSION: This paper shows the simulation of the experimental data regarding the complete degradation of AMX (100%) by HPLC, comparing the experimental results and simulation results for AMX degradation using the IrO2/Ta2O5|Ti 70:30. The modeling predicts and validates the disengagement of COD obtained experimentally, considering the mechanism proposed by Trovó and collaborators for the electro-oxidation of AMX to product C6 (C16H22N3O7S) by generating •OH. © 2020 Society of Chemical Industry (SCI). © 2020 Society of Chemical Industry (SCI)