Banca de QUALIFICAÇÃO: PÂMELA VICENTE MARTINS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : PÂMELA VICENTE MARTINS
DATE: 17/02/2022
TIME: 14:00
LOCAL: Via Portal RNP
TITLE:

STUDY OF THE ADSORPTION CAPACITY OF ATMOSPHERIC POLLUTANTS IN CHITOSAN-BASED PELLETS AND IRON MOF

 

KEY WORDS:

MOF, iron, adsorption, carbon dioxide, chitosan, pellets.

PAGES: 86
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Inorgânica
SPECIALTY: Não-Metais e Seus Compostos
SUMMARY:

The increase in the level of carbon dioxide (CO2) in the atmosphere resulting from anthropogenic emissions is one of the main environmental problems faced by civilization today. The largest source of CO2 emissions worldwide comes from the intensive burning of fossil fuels. As CO2 is one of the main gases responsible for the intensification of the greenhouse effect, the increase in its concentration in the atmosphere causes global warming, which causes numerous environmental impacts. Among the gas separation and purification techniques, the adsorption process has been highlighted as a promising treatment method for presenting advantages such as high efficiency, low energy consumption, easy regeneration, and recycling of adsorbents, in addition to having simple operating conditions, able to operate on a large scale. And to contribute to the adsorption process are the MOFs. Listed by IUPAC as one of the chemical innovations that contribute to a sustainable future, due to their high application potential, particularly acting as adsorbents in gas separation technologies. But because MOFs are a fine powder, they are generally not used in fixed beds due to the large pressure drop these fine particles cause. And to carry out the adsorption process on a larger scale using the fixed bed, these porous materials need to be molded into larger particles, such as pellets. Therefore, the objective of this work was to reproduce the synthesis of a MOF based on iron and terephthalic acid that has already been synthesized by our research group. From the MOF, he synthesized pellets using the natural binder chitosan. The MOF-Fe(BDC) materials, and the Pellets (1:1) and Pellets (2:1) were characterized by IV, TG, XRD, and BET. Through these analyzes, it was possible to infer that the MOF-Fe(BDC) synthesized in this work is the same produced by our research group. And the pellets were obtained and shown to be stable structures. After characterization, MOF-Fe(BDC) and Pellets were applied in gravimetric tests of carbon dioxide adsorption. Since MOF-Fe(BDC) adsorbed 66.60 mg/g of CO2, pellets (1:1) and pellets (2:1) adsorbed 103.60 mg/g and 102.40 mg/g of the pollutant gas, respectively. The materials showed relevant activity as CO2 adsorbents, showing to be promising for application in fixed-bed column.

BANKING MEMBERS:
Presidente - LUZIA SERGINA DE FRANCA NETA
Externa ao Programa - DIANA QUINTAO LIMA