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http://hdl.handle.net/2445/147657
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DC Field | Value | Language |
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dc.contributor.author | Oriol, Roger | - |
dc.contributor.author | Sirés Sadornil, Ignacio | - |
dc.contributor.author | Brillas, Enric | - |
dc.contributor.author | Rodrigues De Andrade, Adalgisa | - |
dc.date.accessioned | 2020-01-13T11:35:10Z | - |
dc.date.available | 2021-04-24T05:10:28Z | - |
dc.date.issued | 2019-04-24 | - |
dc.identifier.issn | 1572-6657 | - |
dc.identifier.uri | http://hdl.handle.net/2445/147657 | - |
dc.description.abstract | This article reports the synthesis of TiO2 nanotube arrays (TiO2 NTs), grown by Ti anodization, and their use as photoanode in a hybrid photelectrocatalytic (PEC)/photoelectro-Fenton (PEF) treatment of Indigo Carmine solutions in sulfate medium at pH 3.0. The anode was combined with an air-diffusion cathode that ensured continuous H2O2 electrogeneration. Comparative trials by electrochemical oxidation with electrogenerated H2O2 (EO-H2O2), electro-Fenton (EF) and PEF with Pt anode were made. The photoanode was stable operating up to 3 mA cm−2 with irradiation from a 36-W UV LED lamp, showing photoelectroactivity from an anodic potential (Ean) of +0.20 V, as determined by cyclic voltammetry. At 3 mA cm−2, color removal by EO-H2O2 with Pt and PEC with TiO2 NTs was very slow, being much faster in EF, PEF and PEC/PEF due to main role of OH formed from Fenton's reaction upon addition of Fe2+. The absorbance and dye concentration decays agreed with a pseudo-first-order kinetics, yielding a slightly lower rate constant for decolorization because of the formation of colored products. The mineralization ability increased as: EO-H2O2 ≪ EF ≪ PEF < PEC/PEF. The holes photogenerated at the TiO2 NTs surface had higher oxidation ability than OH formed at the Pt surface from water discharge. In PEC/PEF, a slower mineralization was found at 2 mA cm−2, although the final mineralization percentage was similar to that attained at 3 mA cm−2. Both, SO42− and NH4+ ions were released during the treatments, along with isatin-5-sulfonic and formic acids as main products. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Elsevier B.V. | - |
dc.relation.isformatof | Versió postprint del document publicat a: https://doi.org/10.1016/j.jelechem.2019.04.048 | - |
dc.relation.ispartof | Journal of Electroanalytical Chemistry, 2019, vol. 847, num. 113088 | - |
dc.relation.uri | https://doi.org/10.1016/j.jelechem.2019.04.048 | - |
dc.rights | cc-by-nc-nd (c) Elsevier B.V., 2019 | - |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es | - |
dc.source | Articles publicats en revistes (Ciència dels Materials i Química Física) | - |
dc.subject.classification | Depuració de l'aigua | - |
dc.subject.classification | Oxidació electroquímica | - |
dc.subject.other | Water purification | - |
dc.subject.other | Electrolytic oxidation | - |
dc.title | A hybrid photoelectrocatalytic/photoelectro-Fenton treatment of Indigo Carmine in acidic aqueous solution using TiO2 nanotube arrays as photoanode | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/acceptedVersion | - |
dc.identifier.idgrec | 690657 | - |
dc.date.updated | 2020-01-13T11:35:10Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Ciència dels Materials i Química Física) |
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File | Description | Size | Format | |
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690657.pdf | 1.2 MB | Adobe PDF | View/Open |
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