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Title: | A hybrid photoelectrocatalytic/photoelectro-Fenton treatment of Indigo Carmine in acidic aqueous solution using TiO2 nanotube arrays as photoanode |
Author: | Oriol, Roger Sirés Sadornil, Ignacio Brillas, Enric Rodrigues De Andrade, Adalgisa |
Keywords: | Depuració de l'aigua Oxidació electroquímica Water purification Electrolytic oxidation |
Issue Date: | 24-Apr-2019 |
Publisher: | Elsevier B.V. |
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. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1016/j.jelechem.2019.04.048 |
It is part of: | Journal of Electroanalytical Chemistry, 2019, vol. 847, num. 113088 |
URI: | http://hdl.handle.net/2445/147657 |
Related resource: | https://doi.org/10.1016/j.jelechem.2019.04.048 |
ISSN: | 1572-6657 |
Appears in Collections: | Articles publicats en revistes (Ciència dels Materials i Química Física) |
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