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Enhancement of a gaseous diffusion electrode (EDG) using cobalt complex for in situ H2O2 generation and its application in the degradation of the pesticide chlorpyrifos

Grant number: 22/14255-0
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): May 01, 2023
Effective date (End): December 31, 2024
Field of knowledge:Engineering - Sanitary Engineering - Water Supply and Wastewater Treatment
Principal Investigator:Marcos Roberto de Vasconcelos Lanza
Grantee:Larissa Fernandes
Host Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Associated research grant:17/10118-0 - Study and application of electrochemical technology for the analysis and degradation of endocrine interferents: materials, sensors, processes and scientific dissemination, AP.TEM

Abstract

The pesticide chlorpyrifos is organophosphate used on a large scale in various crop types. This class of pesticide is considered toxic to living beings, and few studies have been developed using electrochemical methods for the degradation of this compound. Given the limitation of conventional treatment plants in remediating pesticide residues, advanced oxidative processes (AOPs), become an alternative treatment for this contaminant type. In the case of this work, radical hydroxyl will be generated from hydrogen peroxide produced by oxygen reduction reactions (ORR). In this context, the development of the electrode for the generation of hydrogen peroxide is of paramount importance, because the reduction reactions take place at the cathode. The production of gas diffusion electrodes (GDS) from the carbonaceous matrix is the expertise of the research group in environmental electrochemistry (GPEA), which has been increasingly improved in order of hydrogen peroxide electrogeneration, reducing the energy expenditures and costs in the development process. The technique of carbon matrix modification by an organometallic complex of cobalt (II) porphyrin (Co-Porphyrin) was used in the group for the synthesis of EDG employed in ORR in research developed during a doctoral thesis, but new methods of electrode synthesis are being developed decreasing the use of material, and therefore the cost, and increasing the efficiency of the process. The current project aims at the application of the organometallic complex, Co-Porphyrin, in a new EDG system to evaluate the electrogeneration of H2O2 and degradation of organic compounds, using the pesticide chlorpyrifos, not yet studied in this type of system. Thus, the methods used to monitor the electrogeneration and degradation will be through high-performance liquid chromatography (HPLC) with UV/VIS detector and total organic carbon (TOC) content.

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