Banca de DEFESA: JOSÉ LUIZ CUNHA CORDEIRO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JOSÉ LUIZ CUNHA CORDEIRO
DATE: 04/05/2022
TIME: 14:00
LOCAL: Auditório IEDA/IGEO
TITLE:

PRODUCTION OF SUSTAINABLE CARBONACEOUS STRUCTURES AND THEIR APPLICATION IN THE REMOVAL OF VOLATILE ORGANIC COMPOUNDS (VOCs)

KEY WORDS:

Activated Carbon, Pseudosteam of banana, adsorption, Volatile Organic Compouds

PAGES: 123
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Inorgânica
SPECIALTY: Físico Química Inorgânica
SUMMARY:

Activated carbons were prepared from banana pseudostem and used to capture
5 different volatile organic compounds (VOCs), which are dichloromethane,
chloroform, ethyl acetate, hexane and cyclohexane. The biomass was first dried
in an oven and passed through a process of hydrothermal pyrolysis followed by
a dry pyrolysis and the activating agents used were KOH or ZnCl2. Activated
carbons showed high surface areas (701-1312m²/g), and different pore size
distributions. VOC capture studies were performed in TG and capacity up to
933mg/g for dichloromethane, 775mg/g for chloroform, 480mg/g for ethyl acetate,
414mg/g for hexane and 376mg/g for cyclohexane were reached, and these
values are higher than those presented by some studies in the literature. Higher
adsorption capacities were related to the amount of available micropores, and
this capture capacity was enhanced by the amount of small mesopores. As the
highest adsorbed amounts were obtained for the material activated with ZnCl2 in
greater proportions and for the dichloromethane molecule, further studies were
carried out with this adsorbent and this adsorbate. The variation of the adsorption
isotherm showed that it is an exothermic process and that it is governed by
physisorption, and this hypothesis was confirmed with the pseudo first order
kinetic model, and this model was the one that most adjusted to the studies . The
study in different atmospheres showed that there is a coadsorption phenomenon
and the relative humidity studies showed that the capture capacity decreases
slightly at equilibrium. The cycle test proved that the adsorbent can be used in up
to 10 adsorption/desorption cycles without significantly losing its efficiency.

BANKING MEMBERS:
Presidente - 2362069 - RAILDO ALVES FIUZA JUNIOR
Interna - 282610 - HELOYSA MARTINS CARVALHO ANDRADE
Interna - 1861434 - VALERIA CRISTINA FERNANDES
Externo à Instituição - JAIME SOARES BOAVENTURA FILHO - UFBA
Externa à Instituição - SUZANA MODESTO DE OLIVEIRA BRITO - UEFS
Externa à Instituição - TEREZA SIMONNE MASCARENHAS SANTOS - UEFS