Banca de QUALIFICAÇÃO: MAICON OLIVEIRA MIRANDA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : MAICON OLIVEIRA MIRANDA
DATE: 10/12/2020
TIME: 09:00
LOCAL: Remotamente pelo google meet
TITLE:

TITANIUM NANOPARTICLES SUPPORTED IN MESOPOROUS CARBON OF TYPE CMK-3 FOR DEGRADATION OF IBUPROFEN.

KEY WORDS:

mesoporous, photocatalysis, ibuprofen.

PAGES: 102
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Físico-Química
SPECIALTY: Cinética Química e Catálise
SUMMARY:

TiO₂ nanoparticles dispersed in ordered mesoporous CMK-3 carbon with different Ti contents were successfully synthesized and their activity in the photocatalytic degradation of ibuprofen was presented. The photocatalysts were characterized by X-ray diffraction (XRD), nitrogen adsorption-desorption isotherms, diffuse reflectance, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM-FEG) and transmission electron microscopy (TEM). A simple theoretical-computational study through the single point energy calculation was also presented. Diffractograms, Raman, and XPS spectra confirmed the formation of anatase and graphitic carbon. Low-angle XRD, N₂ physisorption and the TEM images indicated that the CMK-3 support does not undergo a significant change in the mesoporous structure after the insertion of TiO₂. The I_D/I_G ratio observed in the Raman spectra did not vary significantly with an increase in the titanium content, which shows that the crystallinity of CMK-3 is practically unchanged. Anatase crystallite sizes vary from 8 to 15 nm and specific areas vary from 348 to 586 m².g^-1, depending on the TiO₂ content. The single point energy calculation confirmed the lowest energy to stabilize the titanium oxide and carbon composite for the sample with 1% of Ti compared to 8 and 18%. The 1% TiO₂/CMK-3 photocatalyst exhibited the best photocatalytic performance, reaching 100% degradation in just 5 min. Chemical oxygen demand and total organic carbon results confirmed the mineralization of ibuprofen. The degradation and mineralization mechanism of ibuprofen follows a sequence of radical reactions that occur in solution and on the solid surface, and may lead to the formation of intermediates before its mineralization.

BANKING MEMBERS:
Presidente - 2087667 - TIAGO PINHEIRO BRAGA
Interno - 1959889 - DAVI SERRADELLA VIEIRA
Externa ao Programa - 1271737 - CAMILA PACELLY BRANDÃO DE ARAÚJO
Externa à Instituição - ANNE GABRIELLA DIAS SANTOS - UERN