Banca de QUALIFICAÇÃO: RENATO PEREIRA DE SOUSA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE: RENATO PEREIRA DE SOUSA
DATA: 06/11/2024
HORA: 14:00
LOCAL: Auditório do PPGQ - UFPI
TÍTULO: Moxifloxacin photoelectrocatalytic degradation on CuWO 4 /g-C 3 N 4 photoanodes
PALAVRAS-CHAVES: Remediação ambiental; Processos oxidativos avançados; Fotocatálise heterogênea
PÁGINAS: 30
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Físico-Química
ESPECIALIDADE: Cinética Química e Catálise
RESUMO:

Antibiotic residues in wastewater have been causing negative effects on human health
and aquatic organisms. Photoelectrocatalysis is a promising alternative to reduce these effects.
Therefore, the present study successfully synthesized CuWO 4 /g-C 3 N 4 (CW/CN 5, 10, and 20
wt% g-C 3 N 4 ) composites using the hydrothermal method. The fabricated photoanodes were
tested for their effectiveness in breaking down moxifloxacin hydrochloride (MOX) in aqueous
media under polarization (0.7 V vs. Ag/AgCl) (EHP system) and polychromatic irradiation
conditions. Various analytical techniques such as XRD, FE-SEM, XPS, and UV-Vis were
used to characterize the photoanodes. The UV-Vis data of the composites exhibited an
increase in the band gap of the composites due to the presence of g-C 3 N 4 . The FE-SEM images
showed that the composites presented a smaller average particle size, which conferred greater
porosity and surface area, especially for the CW/CN20 photoanode, compared to the pure
CuWO 4 . The photoelectrochemical analyses revealed that, although the photoanodes presented
lower photocurrent density than the pure CuWO 4 , they presented longer recombination times.
The CW/CN20 photoanode exhibited a MOX removal efficiency of approximately 49.89%,
higher than that achieved in the test without polarization (HP system). Notably, the h + and •OH
radicals were the most important species in the degradation of MOX. The bactericidal tests
showed that the degraded MOX solution presented a higher MIC, indicating that its
antibacterial activity was reduced by half, then to the standard solution, confirming that MOX
decreased its concentration by half during the photoelectrocatalytic tests. Finally, this study
seeks to contribute information about the development of efficient and
cheap photocatalysts for environmental remediation.

MEMBROS DA BANCA:
Presidente - 756.483.183-91 - GERALDO EDUARDO DA LUZ JUNIOR - UESPI
Interno - 1998602 - EVERSON THIAGO SANTOS GERONCIO DA SILVA
Interno - 1508806 - WELTER CANTANHEDE DA SILVA
Externo à Instituição - 036.803.913-74 - PRISCILA BRANDÃO DE SOUSA - IFMA