Electrochemical and sonoelectrochemical processes applied to amaranth dye degradation

Autor(es)

Steter, Juliana R. ^[1] ; Barros, Willyam R. P. ^[2] ; Lanza, Marcos R. V. ^[3] ; Motheo, Artur J. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo. Sao Carlos Inst Chem

^[2] Univ Sao Paulo. Sao Carlos Inst Chem

^[3] Univ Sao Paulo. Sao Carlos Inst Chem

^[4] Univ Sao Paulo. Sao Carlos Inst Chem

• Tipo de documento: Artigo Científico
• Fonte: Chemosphere; v. 117, p. 200-207, DEC 2014.
• Citações Web of Science: 40

Resumo

Amaranth dye is an organic compound largely used in the food and beverage industries with potential toxicity effects on humans. It can be found as a pollutant species in aquatic environments and has been classified as an endocrine disruptor. This study describes amaranth degradation upon ultrasonication associated with an electrochemical system that uses a boron-doped diamond anode BDD, defined as a sonoelectrochemical process. Ninety-minute electrolyses were performed using current densities in the 10-50 mA cm(-2) range, and the concentration decay, pH, energy and current efficiencies, as well as the discoloration rate were evaluated. The amaranth concentration decayed as a function of electrolysis time and the reactions obeyed pseudo first-order kinetics, with an apparent constant rate between 10(-1) and 10(-3) min(-1). The electrochemical and sonoelectrochemical processes at 35 mA cm(-2) yielded TOC removal values between 92.1% and 95.1% respectively, after 90 min. Current efficiency values obtained for both processes were 18.2% and 23.6%. Exhaustive 5 h electrolysis was performed and the degradation products were identified by HPLC-MS. A mechanism for the degradation of amaranth was proposed based on an analysis of the aromatic and aliphatic intermediates. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 11/06681-4 - Aplicação dos processos oxidativos avançados (POA) a partir da eletrogeração de H2O2 in situ para a degradação dos corantes alimentícios: Amaranto, Tartrazina, Azul Brilhante FCF e Verde Rápido
• Beneficiário: Willyam Róger Padilha Barros
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 11/00535-6 - Aplicação dos processos oxidativos avançados (POA) a partir da eletrogeração de H2O2 in situ para a degradação dos corantes alimentícios
• Beneficiário: Marcos Roberto de Vasconcelos Lanza
• Modalidade de apoio: Auxílio à Pesquisa - Regular