Banca de QUALIFICAÇÃO: IZABELLE CRISTINA DA COSTA SOARES

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : IZABELLE CRISTINA DA COSTA SOARES
DATE: 08/07/2021
TIME: 16:00
LOCAL: VIDEO CONFERENCIA
TITLE:

Theoretical Theoretical and experimental insights into degrading organic compounds: experimental conditions, technologies and pollutants..

KEY WORDS:

Azo dyes. Advanced Oxidative Electrochemical Processes. Electro-Fenton. Photoelectro-Fenton.

PAGES: 90
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Analítica
SPECIALTY: Eletroanalítica
SUMMARY:

The quality of water, as well as its pollution, has generated great concern in the scientific community. This problem has been accompanied by growing public interest, generating a political demand to legislate more rigorously the limits of emission and contents of pollutants in water. Within this context, electrochemical water treatment technologies are highly promising for environmental remediation. These technologies are based on the high oxidizing power of hydroxyl radicals (•OH), which have a high reactivity to oxidize organic compounds present in effluents. Therefore, this thesis studied the application of different Advanced Oxidative Electrochemical Processes (EAOPs) to treat contaminated synthetic solutions. The influence of different functional groups on the dye structure was evaluated by potentiodynamic measurements and by computational analysis, which allowed to carry out morphological studies in the boundary orbitals where the electrons are more energetic and, then, the transfer of electrons to the electrode surface is performed, which was associated with electrochemical measurements. Furthermore, theoretical studies were used to understand mass electrolysis in terms of mineralization. The reactive azo textile dyes Reactive Orange 16, Reactive Violet 4, Reactive Red 228 and Reactive Black 5 were chosen because they have the same molecular base structure with different functional groups. In the case of chapter 4, electrochemical and photoelectrochemical treatments using UVA and solar radiation were used. A solution containing the herbicide Triclopyr was treated at neutral pH by different EAOPs. The comparison with the electro-Fenton treatments revealed the crucial role of the photo-Fenton reaction, as it promoted the production of soluble Fe(II) which favored the removal of the pesticide. The Fe(III)-EDDS (1:1) complex proved to be an efficient iron catalyst for the treatment of the herbicide triclopyr at neutral pH by the PEF process. Finally, a plausible route for the degradation of the herbicide catalyzed by Fe(III)-EDDS by PEF and SPEF is finally proposed based on the detected by-products: three heteroaromatic compounds and four linear N-aliphatic compounds, formamide and tartronic and oxamic acids. The EAOPs studied in this work proved to be satisfactory and sustainable technologies for the treatment of effluents..

BANKING MEMBERS:
Presidente - 1645110 - CARLOS ALBERTO MARTINEZ HUITLE
Externa ao Programa - 2275848 - ELISAMA VIEIRA DOS SANTOS
Externa à Instituição - DANYELLE MEDEIROS DE ARAUJO - UERN