Journal
WATER RESEARCH
Volume 106, Issue -, Pages 171-182Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2016.09.056
Keywords
Electro-oxidation; Amoxicillin; Ti4O7 anode; Hydroxyl radicals; Plasma deposition; Mineralization
Funding
- EU through the Erasmus Mundus Joint Doctorate Programme ETeCoS3 (Environmental Technologies for Contaminated Solids, Soils and Sediments) [2010-0009]
- ANR (French National Research Agency) through ANR EcoTechnologies et EcoServices (ECO TS) of the CElectrON project: Couplage Electro-Oxydation et Nanofiltration pour le traitement d'effluents [ANR-13-ECOT-0003-03]
- Agence Nationale de la Recherche (ANR) [ANR-13-ECOT-0003] Funding Source: Agence Nationale de la Recherche (ANR)
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Electrochemical degradation of aqueous solutions containing antibiotic amoxicillin (AMX) has been extensively studied in an undivided electrolytic cell using a sub-stoichiometric titanium oxide (Ti4O7) anode, elaborated by plasma deposition. Oxidative degradation of AMX by hydroxyl radicals was assessed as a function of applied current and was found to follow pseudo-first order kinetics. The use of carbon-felt cathode enhanced oxidation capacity of the process due to the generation of H2O2. Comparative studies at low current intensity using dimensional stable anode (DSA) and Pt anodes led to the lower mineralization efficiencies compared to Ti4O7 anode: 36 and 41% TOC removal for DSA and Pt respectively compared to 69% for Ti4O7 anode. Besides, the use of boron doped diamond (BDD) anode under similar operating conditions allowed reaching higher mineralization (94%) efficiency. Although Ti4O7 anode provides a lesser mineralization rate compared to BDD, it exhibits better performance compared to the classical anodes Pt and DSA and can constitutes an alternative to BDD anode for a cost effective electro-oxidation process. Moreover several aromatic and aliphatic oxidation reaction intermediates and inorganic end-products were identified and a plausible mineralization pathway of AMX involving these intermediates was proposed. (C) 2016 Elsevier Ltd. All rights reserved.
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