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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.)

Tailoring the ORR selectivity for H2O2 electrogeneration by modification of Printex L6 carbon with 1,4-naphthoquinone: a theoretical, experimental and environmental application study

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Author(s):
Kronka, Matheus S. [1, 2] ; Silva, Fernando L. [1] ; Martins, Alysson S. [1, 2] ; Almeida, Michell O. [1] ; Honorio, Kathia M. [3] ; Lanza, Marcos R. V. [1, 2]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Sao Carlos Inst Chem, Ave Trabalhador Sao Carlense 400, BR-13566590 Sao Carlos, SP - Brazil
[2] Sao Paulo State Univ, Natl Inst Alternat Technol Detect Toxicol Evaluat, Inst Chem, BR-14800900 Araraquara, SP - Brazil
[3] Univ Sao Paulo, Sch Arts Sci & Humanities, Arlindo Bettio 1000, BR-03828000 Sao Paulo, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: MATERIALS ADVANCES; v. 1, n. 5, p. 1318-1329, AUG 1 2020.
Web of Science Citations: 1
Abstract

The modification of carbon-based materials with electroactive organic compounds can improve the oxygen reduction reaction (ORR) efficiency toward H2O2 electrogeneration. The present work sought to evaluate the electrochemical properties of a Printex L6 carbon matrix modified with 1,4-naphthoquinone (NQE) and its application toward the removal of paracetamol in different advanced oxidation processes. The 1.0% NQE-modified material showed 93% selectivity for H2O2 electrogeneration compared to 85% for the unmodified carbon matrix. Density functional theory calculations helped confirm the NQE action as an H+ donor by improving the Delta G of the reaction from -277.11 kJ mol(-1) for PL6C to -986.1 kJ mol(-1) for the NQE-modified material. Applied at 75 mA cm(-2), the modified gas diffusion electrode presented a 30% increase in H2O2 electrogeneration compared to the unmodified electrode. Paracetamol removal followed pseudo-first-order reaction kinetics in the following order: anodic oxidation with H2O2 electrogeneration (AO-H2O2) < AO-H2O2/UVC < electro-Fenton (EF) < photoelectro-Fenton (PEF). The action of the NQE modifier helped enhance the ORR activity and selectivity for H2O2 electrogeneration, thus making the material suitable for environmental application in wastewater treatment. (AU)

FAPESP's process: 14/50945-4 - INCT 2014: National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies
Grantee:Maria Valnice Boldrin
Support type: Research Projects - Thematic Grants
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 type: Research Projects - Thematic Grants
FAPESP's process: 17/23464-3 - Study of agrochemical degradation paraquat, sodium-metham and carbaryl by Electrochemical Advanced Oxidation Process (EAOP) using gas diffusion electrode modified with bimetallic oxides
Grantee:Matheus Schiavon Kronka
Support type: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 15/14669-5 - Electrosynthesis evaluation of hydrogen peroxide (H2O2) in carbon modified with 1,4 – Naphthoquinone
Grantee:Matheus Schiavon Kronka
Support type: Scholarships in Brazil - Scientific Initiation