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

Author(s)

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

Affiliation

^[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

• Document type: Journal article
• Source: Electrochimica Acta; v. 338, APR 1 2020.
• Web of Science Citations: 0

Abstract

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)

• FAPESP's process: 16/04825-2 - Effect of interferents and operational features on the degradation of endocrine disruptors
• Grantee: Dawany Dionisio
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 17/20444-1 - Electrochemical processes applied to the remediation of simulated and real complex aqueous systems
• Grantee: Artur de Jesus Motheo
• Support Opportunities: Regular Research Grants
• FAPESP's process: 16/19662-1 - Preservatives degradation: coupling processes, organic interfering effect and scale-up
• Grantee: Dawany Dionisio
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)
• FAPESP's process: 17/10118-0 - Study and application of electrochemical technology for the analysis and degradation of endocrine interferents: materials, sensors, processes and scientific dissemination
• Grantee: Marcos Roberto de Vasconcelos Lanza
• Support Opportunities: Research Projects - Thematic Grants