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Tytuł:
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Carbon-based cathodes degradation during electro-Fenton treatment at pilot scale: Changes in H 2 O 2 electrogeneration.
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Autorzy:
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Salmerón I; Plataforma Solar de Almería, Ctra Senés Km 4, 04200, Tabernas, Almería, Spain.
Oller I; Plataforma Solar de Almería, Ctra Senés Km 4, 04200, Tabernas, Almería, Spain. Electronic address: .
Plakas KV; Chemical Process and Energy Resources Institute, Centre for Research and Technology - Hellas (CERTH), 6th Km Charilaou-Thermi Road, Thermi, Thessaloniki, GR 57001, Greece.
Malato S; Plataforma Solar de Almería, Ctra Senés Km 4, 04200, Tabernas, Almería, Spain.
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Źródło:
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Chemosphere [Chemosphere] 2021 Jul; Vol. 275, pp. 129962. Date of Electronic Publication: 2021 Feb 11.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Publication: Oxford : Elsevier Science Ltd
Original Publication: Oxford, New York, : Pergamon Press.
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MeSH Terms:
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Hydrogen Peroxide*
Water Pollutants, Chemical*
Carbon ; Electrodes ; Oxidation-Reduction
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Contributed Indexing:
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Keywords: Electrochemical water treatment; Gas diffusion electrode; Hydrogen peroxide electrogeneration; Iron deposition; Scaling
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Substance Nomenclature:
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0 (Water Pollutants, Chemical)
7440-44-0 (Carbon)
BBX060AN9V (Hydrogen Peroxide)
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Entry Date(s):
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Date Created: 20210302 Date Completed: 20210513 Latest Revision: 20210513
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Update Code:
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20240105
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DOI:
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10.1016/j.chemosphere.2021.129962
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PMID:
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33652284
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Autopsy of carbon-PTFE cathodes was performed by addressing their degradation in a commercial plate-and-frame cell equipped with a Nb-BDD anode. Cell is arranged within an electrochemical pilot plant designed for treating wastewaters by electrochemical Fenton-like processes, thus an efficient electrocatalytic production of H 2 O 2 is necessary to guarantee Fenton's reaction. Significant decrease in H 2 O 2 electrogeneration occurred during pilot plant operation, hindering the efficient performance of Fenton-like processes. Two cathodes were studied, first was operated at pH 3 and second at neutral pH by using EDDS as complexing agent to maintain iron in solution. Electrogenerated H 2 O 2 decreased from 43 mg L -1 to 16 mg L -1 in the first cathode after 50 h of operation and from 49 mg L -1 to 24 mg L -1 in the second one after 26 h of operation. Both were cleaned with 30% (v/v) solution of HCl/water for 24 h and H 2 O 2 production was recovered only in the second cathode (able to generate 39 mg L -1 ). Autopsy of the cathodes was tackled by scanning electron microscopy (SEM) and X-ray energy dispersive (EDX), evidencing a strong degradation of first cathode surface and iron oxide inlays in second one due to the decomposition of Fe 3+ :EDDS and consequent iron precipitation at neutral pH.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2021 Elsevier Ltd. All rights reserved.)