Study of agrochemical degradation paraquat, sodium-metham and carbaryl by Electrochemical Advanced Oxidation Process (EAOP) using gas diffusion electrode modified with bimetallic oxides

• Grant number: 17/23464-3
• Support type: Scholarships in Brazil - Doctorate (Direct)
• Effective date (Start): July 01, 2018
• Effective date (End): July 31, 2021
• Field of knowledge: Engineering - Sanitary Engineering - Water Supply and Wastewater Treatment
• Principal Investigator: Marcos Roberto de Vasconcelos Lanza
• Grantee: Matheus Schiavon Kronka
• Home Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated research grant: 14/50945-4 - INCT 2014: National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies, AP.TEM

Abstract

The major environmental problem in many countries of the world, including Brazil, is the pollution of surface water and the discharge of agricultural wastewater contaminated by recalcitrant organic compounds. According to this situation, it is necessary to develop new technologies for the treatment of contaminated effluents, as in the case of Advanced Oxidation Processes (AOP). Some of the AOPs use hydrogen peroxide (H2O2) as a precursor of the hydroxyl radical (*OH), which can be electrogenerated in situ by means of the O2 Reduction Reaction (ORR) using Gas Diffusion Electrodes (GDE). In this research project will be synthesized and characterized bimetallic oxides (La, Nb, Hf and Zr) incorporated to a Printex L6 carbon matrix to act as catalysts to generation of H2O2. Studies using mentioned metals oxides resulted in both the increase of H2O2 generation and decrease of oxygen reaction reduction potential, that is promising to the studies of them synergism as electro-catalystic for ORR. The most promising materials will be used as a modifier in the GDE electrodes preparation, which will be applied later in the pesticides degradation (paraquat, sodium-metham and carbaryl) using a bench cell and an electrochemical flow reactor. The AOPs used as degradation method will be electro-Fenton, photoelectro-Fenton and H2O2/UV. The degradation monitoring will be evaluated using High Performance Liquid Chromatography (HPLC), Liquid Chromatography coupled with Mass Spectrometry (LC-MS), Total Organic Carbon (TOC), Íon Chromatography (IC) and ecotoxicity essays. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

MARQUES CORDEIRO-JUNIOR, PAULO JORGE; KRONKA, MATHEUS SCHIAVON; GOULART, LORENA ATHIE; VERISSIMO, NATHALIA CAROLINA; MASCARO, LUCIA HELENA; DOS SANTOS, MAURO COELHO; BERTAZZOLI, RODNEI; DE VASCONCELOS LANZA, MARCOS ROBERTO. Catalysis of oxygen reduction reaction for H2O2 electrogeneration: The impact of different conductive carbon matrices and their physicochemical properties. JOURNAL OF CATALYSIS, v. 392, p. 56-68, DEC 2020. Web of Science Citations: 0.

FORTUNATO, V, GUILHERME; KRONKA, MATHEUS S.; DOS SANTOS, ALEXSANDRO J.; LEDENDECKER, MARC; LANZA, V, MARCOS R. Low Pd loadings onto Printex L6: Synthesis, characterization and performance towards H2O2 generation for electrochemical water treatment technologies. Chemosphere, v. 259, NOV 2020. Web of Science Citations: 0.

KRONKA, MATHEUS S.; SILVA, FERNANDO L.; MARTINS, ALYSSON S.; ALMEIDA, MICHELL O.; HONORIO, KATHIA M.; LANZA, MARCOS R. V. Tailoring the ORR selectivity for H2O2 electrogeneration by modification of Printex L6 carbon with 1,4-naphthoquinone: a theoretical, experimental and environmental application study. MATERIALS ADVANCES, v. 1, n. 5, p. 1318-1329, AUG 1 2020. Web of Science Citations: 1.