Banca de DEFESA: ILA GABRIELE DINIZ DIAS DE AZEVEDO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ILA GABRIELE DINIZ DIAS DE AZEVEDO
DATE: 23/02/2023
TIME: 08:00
LOCAL: Sala da Secretaria Integrada de Pós-Graduação do Centro de Tecnologia da UFRN
TITLE:

PHOTOCATALYTIC DEGRADATION OF RHODAMINE B USING COPPER AND NICKEL FERRITS SYNTHESISTED BY THE COMBINED COMPLEXATION METHOD EDTA-CITRATE

KEY WORDS:

Mixed copper and nickel ferrites, photocatalytic degradations, Rhodamine
B.

PAGES: 75
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Operações Industriais e Equipamentos para Engenharia Química
SPECIALTY: Reatores Químicos
SUMMARY:

World pollution has increased more and more due to industrial expansion and
consequently global growth. The aquatic environment is one of the most affected, with
many different types of pollutants being found, which cause pH and temperature
variation, increased chemical oxygen demand and reduced biochemical oxygen demand.
Dyes, make up the class of these pollutants, having an organic nature and resistance to
conventional treatments, requiring the application of more effective processes such as
Advanced Oxidative Processes (AOP's). AOP's cover a wide range of processes, among
which are methods that use semiconductor catalysts to promote the generation of
hydroxyl radicals (HO•), and these catalysts can be of different natures, and among
them, ferrites. Ferrites, with general formula, MFe2O4, are chemically and
mechanically stable magnetic materials, where M represents cations of bivalent metals
and can be represented by a mixture of them in order to improve the properties of the
materials. From this, the present master's thesis qualification aims at the use of mixed
copper and nickel ferrites (NixCu1-xFe2O4), in different proportions (x = 0; 0.2; 0.8
and 1), to degrade photocatalytically the dye Rhodamine B, simulating an industrial
effluent containing dye, in order to verify which material is more effective in the
degradation. Where, the mixed copper and nickel ferrites were synthesized by the
combined EDTA-Citrate complexation method, according to the methodology
developed by Rodrigues (2020), calcined at 700 °C for 240 minutes, later the samples
were characterized by XRD, Ritveld refinement, SEM-FEG, TG, FT-IR and ERD UV-
Vis. Afterwards, a series of tests were developed to define the most efficient approach
to degradation of the Rhodamine B dye, namely: self-degradation, photolysis and
photocatalysis, where photocatalytic degradations showed better results. Finally,

reaction parameters such as pH and catalyst load were changed in order to find the
optimal reaction conditions, which were achieved for a catalyst load of 0.62 g/L, pH =
10 and dye concentration of 10 ppm. Finally, the samples containing the highest copper
content, CuFe2O4 and Ni0,2Cu0,8Fe2O4, obtained the best degradation results with
approximately 60% removal of the Rhodamine B dye.

COMMITTEE MEMBERS:
Presidente - 2929066 - ANDRE LUIS LOPES MORIYAMA
Interna - 1271737 - CAMILA PACELLY BRANDÃO DE ARAÚJO
Interno - 349801 - CARLSON PEREIRA DE SOUZA
Externa ao Programa - ***.567.564-** - YARA FELICIANO GOMES - UFRN
Externa à Instituição - MAITÊ MEDEIROS DE SANTANA E SILVA - UFRN