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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

Texto completo
Autor(es):
Vasconcelos, V. M. [1] ; Ponce-de-Leon, C. [2] ; Nava, J. L. [3] ; Lanza, M. R. V. [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[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
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Journal of Electroanalytical Chemistry; v. 765, p. 179-187, MAR 15 2016.
Citações Web of Science: 30
Resumo

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)

Processo FAPESP: 14/12661-4 - Estudo da oxidação eletroquímica dos corantes têxteis reativos azul 19 e preto 5 utilizando eletrodos de diamante dopado com boro em reator filtro prensa
Beneficiário:Vanessa Moura Vasconcelos
Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto