Electro-oxidation of methyl paraben on DSA (R)-Cl-2: UV irradiation, mechanistic aspects and energy consumption

Autor(es)

Dionisio, Dawany ^{[1, 2]} ; Santos, Lucas H. E. ^[1] ; Rodrigo, Manuel A. ^[2] ; Motheo, Artur J. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sao Carlos Inst Chem, POB 780, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Castilla La Mancha, Fac Chem Sci & Technol, Dept Chem Engn, Campus Univ S-N, E-13071 Ciudad Real - Spain

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 338, APR 1 2020.
• Citações Web of Science: 0

Resumo

The electro-oxidation of methylparaben (MeP) was studied using a DSA (R)-Cl-2 in simple electrolysis and hybrid process (electrolysis followed by UV light irradiation), aiming at evaluating the oxidation mechanism, the removal of organic matter and the energy consumption. Analysis of the results revealed that MeP removal is rapid in both processes. However, the formation of a solid byproduct of a polymeric nature, which is probably related to MeP oxidation products, has occurred. Irradiation of UV light in the solution improved the mineralization process by facilitating the degradation of byproducts, including the solid one. Using the hybrid process, mineralization increased by 40% with low additional energy costs. In addition, new aspects about the MeP electrooxidation mechanism were found. The use of the DSA (R)-Cl2 appears to favor oxidative coupling reactions, resulting in higher molecular weight products prior to aromatic ring breakdown and further mineralization. (C) 2020 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 16/04825-2 - Efeito de interferentes e de características operacionais na degradação de desreguladores endócrinos
• Beneficiário: Dawany Dionisio
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 17/20444-1 - Processos eletroquímicos aplicados à remediação de sistemas aquosos complexos simulados e reais
• Beneficiário: Artur de Jesus Motheo
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/19662-1 - Degradação de conservantes: acoplamento de processos, efeito de interferentes orgânicos e aumento de escala
• Beneficiário: Dawany Dionisio
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto
• Processo FAPESP: 17/10118-0 - Estudo e aplicação da tecnologia eletroquímica para a análise e a degradação de interferentes endócrinos: materiais, sensores, processos e divulgação científica
• Beneficiário: Marcos Roberto de Vasconcelos Lanza
• Modalidade de apoio: Auxílio à Pesquisa - Temático