Banca de QUALIFICAÇÃO: ELTON DA NÓBREGA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : ELTON DA NÓBREGA SILVA
DATE: 08/02/2021
TIME: 08:30
LOCAL: Virtual
TITLE:

Synthesis by coprecipitation of copper ferrite and its application in photochemical reactions.

KEY WORDS:

herbicides, 2,4-D, copper ferrite, catalyst.

PAGES: 88
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

The increase in the consumption of pesticides, including herbicides, has caused a series of respect for their application and their consequences for humans and the environment. One of the most widely used herbicides in the world is 2,4-dichlorophenoxyacetic acid (2,4-D), however, its presence has been reported to be present in water bodies, causing impacts on the health of animals and humans. To degrade this contaminant, in this work copper ferrite (CuFe₂O₄) was synthesized using the coprecipitation method. The catalyst was studied in photodegradation reactions of the 2,4-D herbicide in aqueous solution, through heterogeneous photocatalysis with and without the addition of auxiliary oxidizing agents. The samples were was synthesized using the ratio 0.1 and 0.5 metal / base, using two types of salts, one with the Fe²⁺ ion and the other with the Fe³⁺ ion. A sample established by the Pechini method was synthesized for comparative purposes between the production methods. The catalysts were collected in a thermogravimetric test and calcined at 600°C. X-ray diffractograms were performed to determine the formation of the copper ferrite phase. A preliminary photocatalytic test was carried out to choose the catalyst with the best performance, the best sample being 0.1_Fe³⁺Cu, which with H₂O₂ degraded a large amount of 2,4-D. The parameters of the photocatalytic experiments were studied, such as: pH, concentration of catalyst, concentration of herbicide, concentration of oxidizing agent. The catalyst degraded 100% of the herbicide in 60 min of reaction. With the experimental data, following the law of the initiates, a law of speed was created that represents the model of the system. The law of speed followed a Langmuir-Hinshelwood kinetics and the reaction mechanism was studied, being possible that the catalyst obtained high performance in the degradation of 2,4-D with H₂O₂.

BANKING MEMBERS:
Presidente - 2929066 - ANDRE LUIS LOPES MORIYAMA
Externa ao Programa - 1271737 - CAMILA PACELLY BRANDÃO DE ARAÚJO
Interno - 349801 - CARLSON PEREIRA DE SOUZA
Externa à Instituição - VIVIAN STUMPF MADEIRA - UFPB