title: Sub-stoichiometric titanium oxide (Ti4O7) as a suitable ceramic anode for electrooxidation of organic pollutants: A case study of kinetics, mineralization and toxicity assessment of amoxicillin.
abstract: 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 Ti4O7anode: 36 and 41% TOC removal for DSA and Pt respectively compared to 69% for Ti4O7anode. Besides, the use of boron doped diamond (BDD) anode under similar operating conditions allowed reaching higher mineralization (94%) efficiency. Although Ti4O7anode 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.
authors.affiliation: Université Paris-Est, Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, 77454, Marne-la-Vallée, France.
authors.forename: Soliu O
authors.initials: SO
authors.lastname: Ganiyu
authors.affiliation: Université Paris-Est, Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, 77454, Marne-la-Vallée, France.
authors.forename: Nihal
authors.initials: N
authors.lastname: Oturan
authors.affiliation: SAINT-GOBAIN CREE, 550 Avenue Alphonse Jauffret, 84300, Cavaillon, France.
authors.forename: Stéphane
authors.initials: S
authors.lastname: Raffy
authors.affiliation: IEM (Institut Européen des Membranes), UMR 5635 (CNRS-ENSCM-UM), Université de Montpellier, Place E. Bataillon, F-34095, Montpellier, Cedex 5, France.
authors.forename: Marc
authors.initials: M
authors.lastname: Cretin
authors.affiliation: IEM (Institut Européen des Membranes), UMR 5635 (CNRS-ENSCM-UM), Université de Montpellier, Place E. Bataillon, F-34095, Montpellier, Cedex 5, France.
authors.forename: Roseline
authors.initials: R
authors.lastname: Esmilaire
authors.affiliation: Université Paris-Est, Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, 77454, Marne-la-Vallée, France.
authors.forename: Eric
authors.initials: E
authors.lastname: van Hullebusch
authors.affiliation: Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Via Di Biasio 43, 03043, Cassino, FR, Italy.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Esposito
authors.affiliation: Université Paris-Est, Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, 77454, Marne-la-Vallée, France. Electronic address: Mehmet.oturan@univ-paris-est.fr.
authors.forename: Mehmet A
authors.initials: MA
authors.lastname: Oturan
mesh_terms: D000658:Amoxicillin; D001895:Boron; D002516:Ceramics; D018130:Diamond; D004566:Electrodes; D006861:Hydrogen Peroxide; D007700:Kinetics; D010084:Oxidation-Reduction; D014874:Water Pollutants, Chemical
chemical_list: D014874:Water Pollutants, Chemical; D018130:Diamond; D000658:Amoxicillin; D006861:Hydrogen Peroxide; D001895:Boron
keywords: Amoxicillin; Electro-oxidation; Hydroxyl radicals; Mineralization; Plasma deposition; Ti(4)O(7) anode