Competitive Anodic Oxidation of Methyl Paraben and Propylene Glycol: Keys to Understand the Process

Autor(es)

Dionisio, Dawany ^{[1, 2]} ; Motheo, Artur J. ^[2] ; Saez, Cristina ^[1] ; Canizares, Pablo ^[1] ; Rodrigo, Manuel A. ^[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: CHEMELECTROCHEM; v. 6, n. 3, p. 771-778, FEB 1 2019.
• Citações Web of Science: 2

Resumo

This work focuses on the competitive oxidation of two very different molecules, when they underwent electrochemical oxidation with diamond electrodes. To shed light on the mechanisms of this competitive oxidation, solutions containing methyl paraben and propylene glycol at different ratios are electrolyzed (using sulfate or chloride supporting electrolytes). Results obtained pointed out that removal of both species can be easily attained by the electrochemical process, being promoted the mineralization by the action of the sulfate derivative products and the formation of chlorinated hydrocarbons by the action of chlorine oxidants, although the mechanisms of the oxidation do not depend on the primary anion contained in the waste. The higher the concentration of species to be oxidized, the higher is the amount of intermediates and the slower is the mineralization the ratio influences. An important outcome is that there is a limit concentration in each one organic compound interferes on the degradation of a pollutant. Thus, the interference effect of PG on MeP oxidation was only observed for low MeP/PG ratios. (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: 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