Banca de QUALIFICAÇÃO: ELIZANGELA TEIXEIRA DE SOUZA NEVES

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : ELIZANGELA TEIXEIRA DE SOUZA NEVES
DATE: 13/02/2025
TIME: 08:30
LOCAL: meet.google.com/adi-rtrz-xtt.
TITLE:

SYNTHESIS OF OG AND VO2 COMPOUNDS AND ELECTROCHEMICAL ANALYSIS TO ASSESS SENSITIVITY IN PARACETAMOL DETECTION


KEY WORDS:

Cyclic voltammetry, square wave voltammetry, VO2 synthesis, OG synthesis, electrochemical sensors and paracetamol


PAGES: 84
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Físico-Química
SUMMARY:

 With the high production and use of paracetamol worldwide, concern is growing about quick and simple methods for quantifying this analyte. Therefore, the present work describes the development of electrochemical sensors, based on the deposition of VO2 and OG in different m/m ratios, deposited on a gold electrode for the identification of paracetamol. Using the hydrothermal method, crystalline structures of VO2(B) were obtained using commercial V2O5 as a precursor, proven by the crystallographic peaks obtained. For the synthesis of OG, the modified Hummers method was used. Through XRD it was possible to confirm the formation of the OG, due to the presence of the characteristic diffraction peak at 2θ = 10.49°. The characterization of the proposed sensors was carried out by cyclic voltammetry (VC), square wave voltammetry (VOQ), where it was evaluated that the sensors with a higher concentration of OG presented results of better sensitivity to the presence of paracetamol. One of the factors is the high surface area, which offers more active sites for electrochemical reactions, improving the sensitivity of the sensor. Anodic and cathodic peaks were observed at approximately 0.30 and 0.15 vs Ag/AgCl, respectively, with a shift of the anodic peak in the positive direction. When varying the scanning speed, a linear increase (average linear correlation of 0.99) in the area of peak currents was observed. When the electrodes were exposed to the square wave voltammetry pulse, two regions of peak current were observed at 0.3 and 0.8 vs Ag/AgCl. An increase in peak current was also observed when the concentration of paracetamol increased. Therefore, the developed electrodes proved to be suitable for determining paracetamol in samples, being a useful tool for fast analyzes with satisfactory accuracy.

 


BANKING MEMBERS:
Presidente - 1742429 - ELIDIA MARIA GUERRA
Externo à Instituição - JOSIMAR RIBEIRO - UFES
Externo à Instituição - ROGERIO DE OLIVEIRA - IFMG
Notícia cadastrada em: 10/02/2025 15:52
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