DEVELOPMENT OF AN ELECTROCHEMICAL SENSOR BASED ON THERMOPLASTIC STARCH AND GRAPHITE FOR DETECTING CATECHOL IN CONTAMINATED WATER

Amanda de Sousa Martinez de Freitas; Cristiane Carla Maciel; Ana Paula Lemes; Marystela Ferreira

Paper Title

Authors

Amanda de Sousa Martinez de Freitas
Cristiane Carla Maciel
Ana Paula Lemes
Marystela Ferreira

Modality

Pôster

Subject area

Síntese e caracterização de materiais

Publishing Date

12/12/2023

Country of Publishing

Brasil

Language of Publishing

Inglês

Paper Page

https://www.even3.com.br/anais/workshop-do-ineo-2023/611423-development-of-an-electrochemical-sensor-based-on-thermoplastic-starch-and-graphite-for-detecting-catechol-in-con

ISBN

978-65-272-0088-8

Keywords

Thermoplastic starch, graphite, electrochemical sensor, contaminated water.

Summary

The development of products made from starch has been growing in recent years, due to the wide availability of this material, that which can be extracted from various natural sources, makes it attractive to the industry. Added to that, there is interest in obtaining alternative materials for application in electrochemical sensing. Thermoplastic starch (TPS) was used because it is a polymer with high availability and biodegradability, which can be incorporated into graphite (Gr) forming a conductive material. This work describes the preparation of four different compositions substrates for the evaluation of the electrochemical properties, varying the mass in the proportion % (w/w) graphite: TPS, A) 80:20, B) 70:30, C) 60:40 and D) 50:50. Such substrates were obtained using TPS, graphite and DMSO. The characterization of the material was done by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), contact angle, X-ray diffraction (XRD) and Raman spectroscopy. In addition, it was also sought to prove the potential of application of the material as a substrate in electrochemical measurements. For thus, tests were carried out using catechol (1,2 dihydroxybenzene). Catechol (CC) is a compound used in the industry as a stabilizer, cosmetics, and antioxidant. Exposure to catechol can bring risks to human health due to the possibility of absorption through the oral, dermal, and respiratory routes. The techniques used allowed to show a good interaction between graphite and TPS and confirmed the predicted conductive properties, showing the potential of application as a substrate, in the development of electrochemical sensors. Electrochemical characterization by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) was also carried out, which allowed defining the best proportion of graphite:TPS as the composite of 60:40 w/w. The technique of differential pulse voltammetry (DPV) was used to determine the catechol molecule over a range of 0.1 to 2.0 mmol l-1, showing a linear regression (R2) of 0.9996 and limit of detection (LOD) and limit of quantitation (LOQ) values equal to 1.85 × 10-6 mol l-1 and 6.18 × 10-7 mol l-1, respectively. The results showed good precision, selectivity, and stability, proving the application as an electrochemical sensor to detect pollutant molecules such as catechol in contaminated water. Acknowledgments: INEO Fapesp 2014/50869-6.

Title of the Event: Workshop do INEO 2023
City of the Event: Nazaré Paulista
Title of the Proceedings of the event: Anais do Workshop INEO 2023
Name of the Publisher: Even3
Means of Dissemination: Meio Digital
DOI: Get DOI

How to cite

FREITAS, Amanda de Sousa Martinez de et al.. DEVELOPMENT OF AN ELECTROCHEMICAL SENSOR BASED ON THERMOPLASTIC STARCH AND GRAPHITE FOR DETECTING CATECHOL IN CONTAMINATED WATER.. In: Anais do workshop INEO 2023. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2023. Available in: https//www.even3.com.br/anais/workshop-do-ineo-2023/611423-DEVELOPMENT-OF-AN-ELECTROCHEMICAL-SENSOR-BASED-ON-THERMOPLASTIC-STARCH-AND-GRAPHITE-FOR-DETECTING-CATECHOL-IN-CON. Access in: 27/07/2024