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Development of disposable electrochemical sensors for the determination and online monitoring of emerging contaminants in degradation processes

Grant number: 23/14335-6
Support Opportunities:Scholarships in Brazil - Post-Doctoral
Effective date (Start): May 01, 2024
Effective date (End): April 30, 2026
Field of knowledge:Engineering - Sanitary Engineering - Water Supply and Wastewater Treatment
Principal Investigator:Marcos Roberto de Vasconcelos Lanza
Grantee:Anderson Martin dos Santos
Host Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

In recent years, electrochemical advanced oxidation processes (EAOP) based on the use of electrogenerated H2O2 from gas diffusion electrodes (GDE) have become a powerful tool for the treatment of contaminated water. However, the method needs detection techniques for the validation and monitoring of sample degradation data and/or H2O2 electrogeneration quickly and online. Because, in most cases, chromatographic and/or spectrometry techniques are the most used for this purpose and offline. An alternative to meet this need would be the use of electrochemical sensors coupled to the degradation system. In this context, the development of simple, practical and lower cost electroanalytical methods for the most varied purposes has been gaining prominence in recent decades. Thus, doing justice to the differentiated properties of carbonaceous materials, such as carbon black (CB, vulcan and printex(6L)) and the chemical, physical and photo-electrocatalytic characteristics of nanostructures of quantum dots and metallic oxides (TiO2, RuO2, ZnO, Nb2O5 and MoO3), the present proposal aims to investigate the application of this important class of materials from the perspective of analytical chemistry, in the sense of developing new GDE arrangements aiming at in situ H2O2 electrogeneration for the degradation of emerging pollutants and, mainly printed electrochemical sensors aiming at both the determination regarding the monitoring of the emerging contaminant in environmental and/or H2O2 in the degradation system throughout the process online, that is, at the same time that the degradation of the endocrine disruptor will be carried out, the electrogeneration of H2O2 and/or the decay of the concentration of the target contaminant will also be monitored through conventional voltammetric techniques and/or of electrochemical immittance. Therefore, this work configures a proposal for online degradation and sensing that is still little explored, but extremely important for the advancement of the degradation technique, mainly in isolated regions where more complex instruments are not available for this type of monitoring. (AU)

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