2026-04-13T05:46:03Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1649412025-12-04T21:00:33Zcom_2072_1057col_2072_478796col_2072_478917

00925njm 22002777a 4500 dc Coria, Gabriela author Sirés Sadornil, Ignacio author Brillas, Enric author Nava, José L. author 2020-06-09T11:19:46Z 2020-06-09T11:19:46Z 2016-07-07 2020-06-09T11:19:46Z 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. Oxidació electroquímica Agents antiinflamatoris Depuració de l'aigua Electrolytic oxidation Antiinflammatory agents Water purification Influence of the anode material on the degradation of naproxen by Fenton-based electrochemical processes