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Title: Photoelectro-Fenton as post-treatment for electrocoagulated benzophenone-3-loaded synthetic and urban wastewater
Author: Ye, Zhihong
Steter, Juliana R.
Centellas Masuet, Francesc A.
Cabot Julià, Pere-Lluís
Brillas, Enric
Sirés Sadornil, Ignacio
Keywords: Electrocoagulació
Depuració d'aigües residuals
Oxidació electroquímica
Purification of sewage
Electrolytic oxidation
Issue Date: 18-Oct-2018
Publisher: Elsevier B.V.
Abstract: The removal of benzophenone-3 (BP-3), a ubiquitous pollutant in municipal wastewater treatment fa-cilities, was optimal by means of a sequential electrocoagulation (EC)/UVA photoelectro-Fenton (PEF)treatment. Overall mineralization was attained upon combination of EC (Fe/Fe cell, 15 mA cm 2, 20 min)with PEF (boron-doped diamond/air-diffusion cell, 33.3 mA cm 2, 720 min), being superior to EC/electro-Fenton (EF) and requiring shorter time than single PEF. In EC, an Al/Al cell yielded the largest removal ofBP-3 in a simulated matrix at pH 11.0 due to precipitation of its neutral form caused by a substantial pHdrop, with optimum current density of 15 mA cm 2. EC of BP-3-loaded urban wastewater at natural pHwas quite effective also with a Fe/Fe cell, being preferred since it provided the required metal catalyst forsubsequent treatment. Among the electrochemical advanced oxidation processes tested, PEF was su-perior to electrochemical oxidation with electrogenerated H2O2(EO-H2O2) and EF, especially when usingthe boron-doped diamond instead of a RuO2-based anode, due to the oxidation of generated activechlorine and hydroxyl radicals, along with the photolytic action of UVA irradiation. GC-MS revealed theformation of 14 cyclic products in PEF treatment, two of them being also formed during EC.
Note: Versió postprint del document publicat a:
It is part of: Journal Of Cleaner Production, 2018, vol. 208, p. 1393-1402
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ISSN: 0959-6526
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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