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. (1st December 2016) - Ganiyu, Soliu O.
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 (Ti4 O7 ) 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 H2 O2 . Comparative studies at low current intensity using dimensional stable anode (DSA) and Pt anodes led to the lower mineralization efficiencies compared to Ti4 O7 anode: 36 and 41% TOC removal for DSA and Pt respectively compared to 69% for Ti4 O7 anode. Besides, the use of boron doped diamond (BDD) anode under similar operating conditions allowed reaching higher mineralization (94%) efficiency. Although Ti4 O7 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. Graphical abstract: Highlights: Ti4 O7 anode prepared by plasma deposition on titanium (Ti) substrate. Degradation and mineralization efficiency increases with increased applied current. Better mineralization efficiency with Ti4 O7 compared to DSA and Pt anodes. Very good oxidation efficiency of Ti4 O7 close to that of BDD anode. H2 O2 enhances degradation but has marginal effect on mineralization of amoxicillin.