Banca de DEFESA: HÉRICA DIAS DA ROCHA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : HÉRICA DIAS DA ROCHA
DATE: 22/07/2021
TIME: 09:00
LOCAL: Programa de Pós-Graduação em Ciência de Materiais
TITLE:

Polymeric membranes for environmental remediation: bactericidal action and removal of organic dyes and heavy metals

KEY WORDS:

Composite membranes. Remediation of aqueous media. Heavy metal ions. Organic dyes. E. coli pathogenic DH5-α.

PAGES: 135
BIG AREA: Outra
AREA: Multidisciplinar
SUMMARY:

Currently, there is a significant demand for new materials capable of removing contaminants, such as organic compounds and heavy metal ions, from aqueous media, to allow the proper disposal of wastewater without causing damage to public health and the environment. At the same time, the appearance of varieties of antibiotic resistant pathogens is an emerging problem. Multidrug-resistant strains of Escherichia coli deserve special attention in human and veterinary medicine worldwide, due to the possibility that the ingestion of water and food contaminated by some of them will cause serious damage, given the possibility that they will accumulate resistance genes for extra-intestinal survival. In this thesis, we describe the preparation of polymethylmethacrylate/(rice husk ash)/polypyrrole (PMMA/CCA/ PPi) composite membranes and they are used as an active agent for the removal of hexavalent chromium (Cr (VI)) and the dyes tartrazine organic (E102) and indigo carmine (IC) dissolved in aqueous solutions. At pH 2, the PMMA/CCA/PPi membranes showed good removal capacity for all three contaminants analyzed, with values (qe; t) equal to (360.5 mg/g; 150 min), (165.7 mg/g; 60 min), and (142.9 mg/ g; 70 min) for Cr (VI), E102 and IC, respectively, where qe is the adsorption capacity and t the saturation time. We also investigated the antimicrobial activity of polymethylmethacrylate/chitosan/(silver nanoparticles) (PMMA/Qui/NPAg) membranes against the pathogenic E. coli DH5-α strain, when their high bactericidal performance was demonstrated. Thus, we suggest that these membranes present themselves as promising materials for application in efficient water remediation protocols, by combining a relatively simple preparation methodology and, respectively, a high adsorption capacity for different types of contaminants and bactericidal capacity for use as an active agent in microbiological filtration systems.  

BANKING MEMBERS:
Externo à Instituição - ANTONIO RIUL JUNIOR - UNICAMP
Externa à Instituição - ALICIA ELIZABETH CHÁVEZ GUAJARDO
Presidente - 1130294 - CELSO PINTO DE MELO
Externo ao Programa - 2823856 - LUCIANO COSTA ALMEIDA
Interna - 1283002 - YEDA MEDEIROS BASTOS DE ALMEIDA