Electrochemical Degradation of Reactive Blue 19 Dye by Combining Boron-Doped Diamond and Reticulated Vitreous Carbon Electrodes

Autor(es)

Vasconcelos, Vanessa M. ^[1] ; Ponce-de-Leon, Carlos ^[2] ; Rosiwal, Stefan M. ^[3] ; Lanza, V, Marcos R.

Afiliação do(s) autor(es)

^[1] V, 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 Erlangen Nuernberg, Martensstr 5, D-91058 Erlangen - Germany

• Tipo de documento: Artigo Científico
• Fonte: CHEMELECTROCHEM; v. 6, n. 13, p. 3516-3524, JUL 1 2019.
• Citações Web of Science: 0

Resumo

Reactive Blue 19 (RB-19) dye has a low fixation efficiency, a long half-life and high toxicity. It is easily loss during the cleaning of textiles and can remain in the environment for a long time, causing serious environmental problems if not removed. This study reports the degradation of RB-19 by: 1) direct electrochemical degradation with boron-doped diamond (BDD) electrodes and 2) combined processes using BDD and reticulated vitreous carbon (RVC) electrodes that generate H2O2. The direct degradation uses different current densities and concentrations. High currents densities, longer electrolysis times and low volumetric flow rates favour RB-19 degradation, removing total colour and 100 % TOC after 5 and 60 min, respectively. At a current density of 41 mA cm(-2) and a volumetric flow rate of 20 dm(3) h(-1), the energy consumption to degrade 20 mg dm(-3) of RB-19 was 279 kWh kg(-1). The TOC removal of RB-19 dye combining BDD and RVC at a current density of 41 mA cm(-2) was below 72 % after 90 min and the energy consumption increased to 612 kWh kg(-1). The higher energy consumption observed during the combined process suggests that the direct degradation process at low volumetric flow rates is more efficient than the combined process. (AU)

• Processo FAPESP: 11/15811-9 - Estudo da degradação dos corantes têxteis Reativo Azul 19 e Black 5 via H2O2 eletrogerado e eletrofenton (H2O2 eletrogerado/fenton) e via eletroxidação direta em eletrodos de TI/DDB
• Beneficiário: Vanessa Moura Vasconcelos
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• 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
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto