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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Electrochemical degradation of RS-5 dye by anodic oxidation, electro-Fenton and by combining anodic oxidation-electro-Fenton in a filter-press flow cell

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Vasconcelos, V. M. [1] ; Ponce-de-Leon, C. [2] ; Nava, J. L. [3] ; Lanza, M. R. V. [1]
Total Authors: 4
[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13563120 Sao Carlos, SP - Brazil
[2] Univ Southampton, Fac Engn & Environm, Southampton SO17 1BJ, Hants - England
[3] Univ Guanajuato, Dept Ingn Geomat & Hidraul, Ave Juarez 77, Guanajuato 36000 - Mexico
Total Affiliations: 3
Document type: Journal article
Source: Journal of Electroanalytical Chemistry; v. 765, p. 179-187, MAR 15 2016.
Web of Science Citations: 30

This paper reports the removal of a recalcitrant and toxic dye, Reactive Black 5 (RB-5) by three methods; 1) anodic oxidation (AO) on Boron-Doped Diamond (BDD), 2) by electro-Fenton (EF) process where hydrogen peroxide was produced by oxygen reduction on reticulated vitreous carbon (RVC) electrodes and 3) by the combination of AO-EF. The BDD and RVC electrodes were fitted in a filter-press flow cell in recyde batch mode of operation. The experimental set-up for the AO and EF processes consisted of two electrolyte compartments separated by a Nafion membrane with the dye contained in the anolyte and the catholyte, respectively. The combined AO-EF process used only one electrolyte compartment. The colour and total organic carbon (TOC) removal were more efficient when the AO and EF processes were used separately than the combined process, AO-EF. The influence of current density and initial concentration of ferrous ions were examined. The lowest energy efficiency (208 kWh kg(-1)) with the EF process was found when -0.4 V vs. Ag/AgCl was applied to a RVC electrode and the concentration of Fe2+ was 1.0 x 10(-4) mol dm(-3) achieving total colour and 74% of TOC removals in less than 90 min electrolysis. All proposed processes were able to promote high percentages of TOC removal following a pseudo-first order kinetic oxidation. The BDD electrode was the most effective material to remove RB-5 dye within 7.5 min and presented the highest apparent rate constant (0.835 min(-1)) with 82% TOC removal within 30 min at an energy consumption of 291 kWh kg -I and 41.1 mA cm(-2) current density. In the case of the combined process AO-EF the electrodegradation rate of RB-5 was at least three times lower, apparent rate constant (0.269 min(-1)), and 32% of TOC was removed with a high EC (682 kWh kg(-1)). Therefore oxidation process applied separately was more efficient. (C) 2015 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 14/12661-4 - Study of electrochemical oxidation of textile dyes reactives blue 19 and black 5 using boron-doped diamond electrodes in a filter-press flow reactor
Grantee:Vanessa Moura Vasconcelos
Support type: Scholarships abroad - Research Internship - Doctorate (Direct)