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Title: Evaluating the electrochemical and photoelectrochemical production of hydroxyl radical during electrocoagulation process
Author: Medel, Alejandro
Ramírez, José A.
Cárdenas, Jesús
Sirés Sadornil, Ignacio
Meas, Yunny
Keywords: Clor
Oxidació electroquímica
Electrolytic oxidation
Issue Date: 8-Jan-2019
Publisher: Elsevier B.V.
Abstract: In this study, we evaluate for the first time the effect of ionic composition on the anodic production of hydroxyl radical (OHa) during electrocoagulation (EC) process in batch using carbon steel electrodes. Likewise, hydroxyl radical production from active chlorine (OHph) electrogenerated in EC photoassisted with UVA (λ = 365 nm) and UVC light (λ = 254 nm) was evaluated using car wash wastewater. Both, OHa and OHph, were analyzed by UV-Vis spectroscopy and fluorescence using coumarin as the probe. Under optimal conditions (j = 8 mA cm−2, 25 °C, 15 min, 6 rpm), turbidity, suspended solids and color were removed by 98.3%, 98.7% and 93.1%, respectively. However, total organic carbon (TOC) abatement only attained 27%. This can be related to the fact that OHa and OHph were not identified during EC, with or without UV irradiation. Hence, the organic matter is mainly removed by coagulation with Fe(OH)n species. Comparative treatment of the same wastewater by electrochemical oxidation (EO) with a Ti|IrO2-Ta2O5 anode in the presence of electrogenerated active chlorine and UVC light demonstrated the generation of OHph, thus encouraging the potential coupling of EC with EO.
Note: Versió postprint del document publicat a:
It is part of: Separation and Purification Technology, 2019, vol. 208, p. 59-67
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ISSN: 1383-5866
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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