Banca de QUALIFICAÇÃO: LUCAS OLIVEIRA DO ROSÁRIO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : LUCAS OLIVEIRA DO ROSÁRIO
DATE: 08/08/2025
TIME: 09:00
LOCAL: videoconferência
TITLE:

Development and application of a novel CaTiO₃/NiO/AgBr ternary heterostructure for the treatment of highly concentrated dyes and its performance as an antimicrobial agent.

KEY WORDS:

ternary heterostructure; advanced oxidation processes; sonophotocatalysis; photocatalysis solar; antimicrobial activity

PAGES: 116
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Inorgânica
SPECIALTY: Foto-Química Inorgânica
SUMMARY:

Industrialization and urbanization have intensified water contamination due to effluents, necessitating new treatment technologies. Advanced oxidation processes based on semiconductors, such as photocatalysis and sonocatalysis, have emerged as promising alternatives. In this context, this study proposes the synthesis and characterization of a novel ternary heterostructure, CaTiO3/NiO/AgBr, with excellent photocatalytic efficiency for the decontamination industrial effluent. The samples were synthesized via microwave-assisted hydrothermal synthesis, followed by calcination and deposition of AgBr particles, and characterized by XRD, FTIR, Raman spectroscopy, FEG-SEM, TEM, UV-Vis/DRS, BET, XPS, PL, Zeta potential, and EPR. Photocatalytic activity was evaluated in methylene blue solution and mixtures of cationic and anionic dyes under sonocatalysis, photocatalysis, and sonophotocatalysis conditions. The heterostructure prepared with the CaTiO3/10%NiO/30%AgBr ratio exhibited the highest degradation performance, attributed to enhanced light absorption capacity, optimized spatial separation of e-/h+ and surface plasmon resonance effect, which boosted the generation of •OH- and •O2- radicals, responsible for mineralization of contaminants. Additionally, the heterostructure demonstrated excellent reusability over at least five consecutive cycles. In vitro assays with Gram-positive and Gram-negative bacteria further confirmed its antimicrobial properties.

COMMITTEE MEMBERS:
Interna - 349770 - DULCE MARIA DE ARAUJO MELO
Externa ao Programa - 1802888 - FABIANA VILLELA DA MOTTA - nullPresidente - 1883170 - MAURICIO ROBERTO BOMIO DELMONTE
Externo à Instituição - RICARDO LUÍS TRANQUILIN - UFSCAR