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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Coupling Ultrasound to the Electro-Oxidation of Methyl Paraben Synthetic Wastewater: Effect of Frequency and Supporting Electrolyte

Full text
Author(s):
Dionisio, Dawany [1, 2] ; Motheo, Artur J. [1] ; Saez, Cristina [2] ; Canizares, Pablo [2] ; Rodrigo, Manuel A. [2]
Total Authors: 5
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
Total Affiliations: 2
Document type: Journal article
Source: CHEMELECTROCHEM; v. 6, n. 4, p. 1199-1205, FEB 15 2019.
Web of Science Citations: 2
Abstract

In this paper, electrooxidation of methyl paraben (MeP) is studied by electrolysis only and electrolysis coupled with sonolysis, using a diamond electrode. Complete mineralization of MeP was achieved for both processes, in chloride and sulfate media. Results showed that, although the oxidation of pollutant is faster in the presence of chloride, the mineralization is favored in sulfate medium. Ultrasound irradiation enhanced the removal of organic matter due to the activation of oxidant species in both supporting electrolytes. Moreover, the formation of chlorine gas in the chloride containing medium improves the ultrasound cavitation effect, promoting faster depletion of the total organic carbon in the first hour of treatment. Regarding the formation of more toxic products, all possible organochlorinated intermediates were removed, since complete mineralization was attained in less than 5 hours. Ultrasonic coupling to the electrolysis process accelerates the destruction of the intermediates and delays the formation of perchlorate, which only begins after the complete removal of the total organic carbon. Low and high ultrasound frequencies were evaluated and were found to produce different effects of cavitation, which affect the electrolysis in different ways. The final result will be a balance between these effects and thus, an optimum frequency can be established for different systems. (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: 16/19662-1 - Preservatives degradation: coupling processes, organic interfering effect and scale-up
Grantee:Dawany Dionisio
Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)