Banca de DEFESA: MARIANA ALVES LEITE DUTRA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : MARIANA ALVES LEITE DUTRA
DATE: 14/08/2020
TIME: 09:00
LOCAL: Remotamente pelo google meet
TITLE:

POLYACRYLAMIDE AND STARCH HYBRIDS HYDROGELS: SYNTHESIS, CHARACTERIZATION AND STUDY OF APPLICABILITY IN WASTEWATER

KEY WORDS:

Hydrogel, adsorption, silver nanoparticles, SERS.

PAGES: 120
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Orgânica
SPECIALTY: Físico-Química Orgânica
SUMMARY:

Starch obtained from Tommy Atkins mango kernel was used in the manufacture of acrylamide hydrogels. These hybrid hydrogels were synthesized by radical in aqueous medium and characterized by FT-IR, ¹³C NMR, SEM, XRD, rheometry and degree of swelling. The different molar proportions of starch / acrylamide and MBA used in the feed caused changes in viscoelastic properties, gelling kinetics, swelling degree and surface morphology. The synthesized hydrogels were evaluated for the potential of adsorption of phenolic pollutants from contaminated waters, proving to be efficient in removing these residues. The equilibrium adsorption (Q_eq) values ranged from 2 to 21 mg / g and were strongly dependent on acrylamide, starch and MBA concentrations in the system. The type of adsorption isotherm that best fitted was that of the Freundlich model, with R² values between 0.95 - 0.97. Hydrogels also showed efficiency in the release of these phenolic pollutants, indicating the possibility of reuse of these materials. In addition, in a second strand of applicability in contaminated waters, hydrogels were able to incorporate silver nanoparticles in their three-dimensional networks, in order to obtain nanocomposites with potential to detect possible water contaminants in the order of 10^-8 mol. L^-1 using the surface amplified Raman spectroscopy (SERS) technique.

BANKING MEMBERS:
Externo à Instituição - ADRIANO LINCOLN ALBUQUERQUE MATTOS - EMBRAPA
Interno - 1198847 - JOSE LUIS CARDOZO FONSECA
Externo à Instituição - MARCUS VINICIUS GOMES PAIXÃO
Externa à Instituição - MORSYLEIDE DE FREITAS ROSA - EMBRAPA
Presidente - 1149440 - ROSANGELA DE CARVALHO BALABAN