Banca de QUALIFICAÇÃO: TARSILA SANTOS DA SILVA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : TARSILA SANTOS DA SILVA
DATE: 28/12/2021
TIME: 14:00
LOCAL: Videoconferência - Google Meet
TITLE:

SYNTHESIS, CHARACTERIZATION AND APPLICATION OF LAYERED DOUBLE HYDROXIDES FROM ALUMINUM WASTE


KEY WORDS:

Hydrotalcite, aluminum waste, adsorption, catalysis. 


PAGES: 77
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

One of the most important and strategic essential industries is the aluminum production. Aluminum is the third most abundant element on Earth and the second most used metal after iron. Inappropriate recycling and reuse of aluminum waste, large amounts of these materials are disposed of in landfills, facing health, ecology and safety risks due to their toxicity and high flammability. These issues are driving the development of new cost-effective and ecologically sound methods of reusing aluminum waste. The production of Lamellar Double Hydroxides (LDH) using aluminum residues can be achieved through the leaching of Al3 + ions, in the form of hydroxide, followed by reaction with the divalent ions. Aluminum ions can be extracted by dissolving the residue in an alkaline or acidic medium. This work had as objective the synthesis and characterization of LDHs obtained from the residues of aluminum frames. The syntheses of LDHs were carried out by the co-treatment and hydrothermal treatment methods, maintaining a 3:1 ratio of Mg/Al. Infrared absorption spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetry (TGA) and specific surface area (BET). The FT-IR wavelengths referring to the synthesized HDL chemical groups did not diverge, the input being commercial aluminum hydroxide or coming from aluminum frames. The X-ray diffractograms of LDHs with indicated peaks characteristic of materials of the hydrotalcite type, which are more intense diffraction elements for the LDH synthesized from the hydrothermal treatment. From the Scherrer equation, an increase in the crystallite size was observed with the increase in the synthesis temperature. A thermogravimetric analysis proceeds by the loss of water adsorbed between the layers, followed by the dehydroxylation of the coverslips with water release, different values in the loss of mass for the studied synthetic conditions. The LDHs obtained showed type IV and the presence of type H3 hysteresis, which evidences the existence of mesoporous structures. The surface area and pore diameter range from 27.66 m2/g to 96.08 m2/g and 36 Ǻ to 39 Ǻ, respectively. From the results obtained, it is possible to verify that LDH produced from aluminum waste has potential for future applications in the areas of catalysis and adsorption. 


BANKING MEMBERS:
Interno - 2278469 - LEONARDO MENDONÇA TENÓRIO DE MAGALHÃES OLIVEIRA
Interno - 1797785 - LUCAS MEILI
Externo à Instituição - PAULO ANSELMO ZIANI SUAREZ - UnB
Presidente - 1515173 - SIMONI MARGARETI PLENTZ MENEGHETTI
Notícia cadastrada em: 09/12/2021 11:41
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