Banca de QUALIFICAÇÃO: ANTONIO BATISTA DE QUEIROZ JUNIOR

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : ANTONIO BATISTA DE QUEIROZ JUNIOR
DATA : 08/03/2022
HORA: 14:00
LOCAL: Plataforma Google meet - https://meet.google.com/zty-oaim-zjw
TÍTULO:

Synthesis of cassava starch biopolymer compounded with zeolite for the treatment of herbicides contaminated water.

PALAVRAS-CHAVES:

Biofilm; Starch; Zeolite; Glyphosate; Adsorption.

PÁGINAS: 72
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:

The exacerbated consumption of agrochemicals and the inappropriate disposal of pesticide residues has configured many environmental problems, mainly directed to water contamination. In this perspective, zeolites have been promising in adsorption processes, because they have specific properties with adsorption capacity, becoming an alternative to this problem. In addition, some configurations of biopolymers have been used in the adsorption of microcontaminants from water, as they have specificities in their structure that allow this characteristic. Thus, in this study, the hybrid compound formed by a biopolymer produced from cassava starch and Beta zeolite was synthesized and characterized, in order to apply it in the adsorption of the herbicide glyphosate. Therefore, in order to investigate the crystalline polymorphic phases of zeolite Beta, the X-Ray Diffraction (XRD) method was used. The thermal properties were analyzed through the techniques of thermogravimetric analysis and differential thermogravimetric analysis. The hydrophilic properties were investigated by studying the degree of swelling of the hybrid formed. Finally, glyphosate herbicide adsorption and identification tests were carried out using the Ion Chromatography (IC) technique. The experiments carried out showed that the biofilm whose composition is formed by 5g of cassava starch, 2.5 ml of glycerol, 100 ml of distilled water and 1 g of zeolite beta, stirred at 80 °C for 20 minutes formed a flexible material. and resistant to aqueous media when immersed for 24 hours. Thermal analysis revealed that the biomaterial Zeolite-Biopolymer (ZBM) demonstrates lower decomposition temperatures, and this may occur due to the activity of acidic sites on the surface of the zeolite, favoring a faster decomposition of the polymer/starch. Still, it was observed that the ZBM has adsorbent characteristics, since it showed adsorption of approximately 57%, 63%, 26%, in solutions with glyphosate concentration of 30, 40 and 50 ppm, respectively. Thus, it is possible to infer that the present study configured the synthesis of the biopolymer composed of Beta zeolite with adsorbent capacity for possible environmental applications in the decontamination of waters with the presence of the herbicide glyphosate.

MEMBROS DA BANCA:
Externo ao Programa - 12768 - KEURISON FIGUEREDO MAGALHÃES
Interna - 2470 - SUELY SOUZA LEAL DE CASTRO
Presidente - 12281 - VINICIUS PATRICIO SANTOS CALDEIRA