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Title: | Influence of the anode material on the degradation of naproxen by Fenton-based electrochemical processes |
Author: | Coria, Gabriela Sirés Sadornil, Ignacio Brillas, Enric Nava, José L. |
Keywords: | Oxidació electroquímica Agents antiinflamatoris Depuració de l'aigua Electrolytic oxidation Antiinflammatory agents Water purification |
Issue Date: | 7-Jul-2016 |
Publisher: | Elsevier B.V. |
Abstract: | This study focuses on the role of the anode material for the electrochemical degradation of the top-selling anti-inflammatory drug naproxen (NPX). Aqueous solutions containing 40 mg L−1 NPX sodium in 0.050 M NaClO4 at pH 3.0 were comparatively treated by electrochemical advanced oxidation processes (EAOPs) like electro-oxidation with electrogenerated H2O2 (EO-H2O2), electro-Fenton (EF) and UVA photoelectro-Fenton (PEF). The experiments were performed in a 2.5 L flow plant equipped with an annular glass photoreactor coupled to a cell with a Pt, IrO2-based (DSA-O2), RuO2-based (DSA-Cl2) or boron-doped diamond (BDD) anode and an air-diffusion cathode to electrogenerate H2O2. In EF and PEF, 0.50 mM Fe2+ was added as catalyst. At 50 mA cm-2, the oxidation power of EAOPs rose in the order: EO-H2O2 < EF < PEF, regardless of the anode used. The IrO2-based anode led to greater mineralization in EO-H2O2 and EF. In contrast, the BDD anode allowed an almost total mineralization in PEF, being superior to 85% attained with the other three materials. DSA, a significantly cheap anode compared to Pt and BDD, can then be a suitable candidate for treating NPX solutions by EAOPs. For each process, the mineralization current efficiency and specific energy consumption were determined. The NPX concentration decay always followed a pseudo-first-order kinetics and, in PEF, it was enhanced in the sequence: RuO2-based < Pt < BDD < IrO2-based. GC-MS analysis of treated solutions allowed detecting six aromatic products, whereas maleic and oxalic acids were identified by ion-exclusion HPLC. A reaction sequence for the degradation of NPX by EAOPs is finally proposed. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1016/j.cej.2016.07.012 |
It is part of: | Chemical Engineering Journal, 2016, vol. 304, p. 817-825 |
URI: | http://hdl.handle.net/2445/164941 |
Related resource: | https://doi.org/10.1016/j.cej.2016.07.012 |
ISSN: | 1385-8947 |
Appears in Collections: | Articles publicats en revistes (Ciència dels Materials i Química Física) |
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