Banca de DEFESA: LAYSA RENATA DUARTE BRITO SABINO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : LAYSA RENATA DUARTE BRITO SABINO
DATE: 12/12/2024
TIME: 09:00
LOCAL: videoconferência
TITLE:

TREATMENT OF SWIMMING POOL WATER CONTAMINATED BY OCTOCRYLENE FROM COMMERCIAL SUNSCREEN.

KEY WORDS:

OCTOCRYLENE; ELECTROCHEMICAL TREATMENT; ELECTROANALYSIS

PAGES: 100
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Analítica
SPECIALTY: Análise de Traços e Química Ambiental
SUMMARY:

Chemical compounds present in sunscreens, such as organic UV filters, particularly octocrylene, can have adverse effects on aquatic ecosystems and negative consequences for human health, as they are endocrine disruptors. Therefore, it is necessary to adequately treat effluents that have this type of contamination. This work proposes to innovate the treatment of swimming pool water using electrochemical processes, more precisely anodic oxidation focusing on the degradation of octocrylene from commercial sunscreens, in order to minimize toxic substances, combined with a simplified methodology for detecting and quantifying this component. After degradation, some parameters of the water quality index were monitored, results such as pH (7.4 t = 0min - 4.4 t = 180min), chloride content (0.002M), current density 10mA/cm², oxygen dissolution ([COD]/[COD]0 = 0.2), conductivity (1091mS/cm t = 0min - 0 mS/cm t = 180min) and turbidity (93.5 t = 0min - 5.64 t = 180min) were found and corroborated the degradation of organic matter. Energy consumption was analyzed throughout the electrolysis. In addition, a comparative study was carried out between the electroanalysis and chromatography techniques for the detection and quantification of octocrylene in pool water, obtaining promising results for the electroanalytical technique of differential pulse voltammetry. The detection and quantification limits of octocrylene from a 0.001 M standard solution were, respectively, 0.11 mg/L and 0.35 mg/L via electroanalysis and 2.86 mg/L and 9.54 mg/L via chromatography. It was possible to observe that electroanalysis was able to quantify octocrylene throughout electrolysis and in real sunscreen samples without significant difference in relation to chromatography.

COMMITTEE MEMBERS:
Interna - 2140818 - AMANDA DUARTE GONDIM
Presidente - 1645110 - CARLOS ALBERTO MARTINEZ HUITLE
Externo à Instituição - JOSÉ EUDES LIMA SANTOS - IFRN
Externa à Instituição - MAIARA BARBOSA FERREIRA - UFRN
Externa à Instituição - MAYRA KEROLLY SALES MONTEIRO - IFRO