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Electrochemical Abatement of Analgesic Antipyretic 4‐Aminophenazone using Conductive Boron‐Doped Diamond and Sub‐Stoichiometric Titanium Oxide Anodes: Kinetics, Mineralization and Toxicity Assessment
Author(s) -
Ganiyu Soliu O.,
Oturan Nihal,
Trellu Clément,
Raffy Stéphane,
Cretin Marc,
Causserand Christel,
Oturan Mehmet A.
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801741
Subject(s) - anode , electrochemistry , mineralization (soil science) , titanium , stoichiometry , inorganic chemistry , chemistry , oxide , kinetics , reaction rate constant , nuclear chemistry , materials science , electrode , nitrogen , organic chemistry , physics , quantum mechanics
The oxidation ability of two prominent eco‐friendly electrochemical advanced oxidation processes (EAOPs), namely anodic oxidation with H 2 O 2 generation (AO‐H 2 O 2 ) and electro‐Fenton (EF) for complete abatement of acidic solution of 4‐aminophenazone (4‐APZ) has been investigated using conductive boron‐doped diamond (BDD) and sub‐stoichiometric titanium oxide (Ti 4 O 7 ) anodes and carbon‐felt cathode. The higher performance of EF compared to AO‐H 2 O 2 with either anode was demonstrated. In all trials, 4‐APZ was completely destroyed, following pseudo first‐order kinetics with the rate constant values increasing with applied current and higher values attained with BDD compared to Ti 4 O 7 anode at similar conditions. The absolute rate constant for the reaction between 4‐APZ and hydroxyl radicals was found to be 3.9±0.2×10 9 L mol −1 s −1 . Complete mineralization could be attained with BDD anode, whereas Ti 4 O 7 anode only showed excellent mineralization up to 94 % TOC removal. Therefore, Ti 4 O 7 anode can constitutes a promising anode material thanks to its lower manufacturing cost. Inorganic ions like NO 3 − and HCO 3 − at concentration up to 25 mM has no effect on mineralization efficiency during AO‐H 2 O 2 , but the presence of Cl − even at lower concentration of 10 mM significantly reduced the TOC removal efficiency. The toxicity of the solution sharply increased at initial stage of treatment, corresponding to the formation of cyclic by‐products but their conversion to carboxylic acids due to longer treatment time involved a sharp toxicity decrease, thus ensuring overall detoxification.