Banca de DEFESA: MARINEZ MARLENE DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARINEZ MARLENE DA SILVA
DATE: 23/08/2023
TIME: 14:00
LOCAL: Campus Arapiraca
TITLE:

DEGRADAÇÃO ELETROQUÍMICA, FOTOQUÍMICA E FOTOELETROQUÍMICA DE CLORANFENICOL USANDO ELETRODOS DE NANOTUBO DE TITÂNIO AUTO DOPADO

KEY WORDS:

dvanced oxidative processes; Emerging contaminants; Electrochemistry; Photoelectrochemistry; Photochemistry; NT-TiO2 electrodes; UV-Vis spectrophotometry; High Performance Liquid Chromatography (HPLC); FTIR.

PAGES: 80
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Físico-Química
SPECIALTY: Eletroquímica
SUMMARY:

In the current global context, emerging contaminants represent challenges in constant growth for the preservation of different environmental matrices, such as water and soil, which are essential for the preservation and maintenance of life. Such contaminants are resistant to conventional treatment processes adopted by treatment plants. In this context, the use of Advanced Oxidative Processes stands out as a promising approach for the treatment of these contaminants by providing an effective alternative in the remediation of these substances and being considered as a clean technology. [U1] In this work, the degradation of chloramphenicol, an antibiotic drug of emerging concern, was investigated using techniques such as: photochemistry, electrochemistry and photoelectrochemistry. The experiments were carried out in different radiation sources and using titanium nanotubes (NT-TiO2) as electrode. Through scanning electron microscopy (SEM) measurements, it was possible to verify that NT-TiO2 was obtained in the anatase crystalline phase. The degradation of the pollutant through the use of light, electrochemistry and photoelectrochemistry was monitored by means of UV/Vis spectrophotometry, which made it possible to monitor the variation in absorbance over time. In addition, the pollutant concentration was analyzed by high performance liquid chromatography (HPLC). It also used the infrared technique (FTIR) in order to evaluate the degradation in terms of possible intermediates through the vibrations of the observed functional groups. Finally, total organic carbon (TOC) analysis was performed to assess the degree of mineralization during the applied oxidative process. The obtained results demonstrated that a degradation rate was obtained in all AOP techniques applied, however in the photoelectrochemistry using NT-Ti electrodes and solar radiation a greater efficiency in the degradation of the contaminant under study was observed. This joint approach resulted in a significant reduction in absorbance over time, indicating the degradation of the compounds. The HPLC analysis confirmed the decrease in the concentration of the pollutant, while the FTIR analysis revealed that there was degradation of the target molecule. In addition, the TOC analysis showed a significant reduction in total organic carbon, indicating the effective removal of polluting compounds.

BANKING MEMBERS:
Interno(a) - 1609640 - VINICIUS DEL COLLE
Interno(a) - 1697766 - WANDER GUSTAVO BOTERO
Externo(a) ao Programa - 1320545 - THAISSA LUCIO SILVA