Strategic design of magnetic carbonaceous nanocomposites and its application as multifunctional adsorbent
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Magnetic carbonaceous nanocomposites (MCN) were prepared by hydrothermal carbonization (HTC) of a
carbohydrate in the presence of Fe3þ, followed by thermal treatment with KOH for simultaneous activation
and magnetization. The precursor formed (IOCN) in the HTC process contained iron oxide
nanoparticles encapsulated in the hydrochar matrix. The thermochemical parameters of the activation
(temperature and IOCN/KOH mass-ratio) were varied to achieve an increase of the specific surface area
along with formation of magnetic phases in MCN compared to IOCN. Activation temperature was found
to be responsible for the structural and morphological properties of the MCNs whereas the IOCN/KOH
mass-ratio controlled the porosity. The magnetic properties of the MCNs originated from the formation
of Fe3O4 and Fe0 phases, which are encapsulated in the carbonaceous material. The MCNs were tested for
adsorption of methylene blue (MB) dye, followed by magnetic separation. The MCN, produced in the
optimized conditions, showed a specific surface area of 766 m2 g 1, magnetization of 8 emu g 1 and a MB
adsorption capacity of 570 mg g 1. Detailed kinetic and isotherm studies of MB adsorption were also
performed. The methodology of simultaneous activation and magnetization to generate MCNs, presented
here, could be extended to obtain new multifunctional carbon-based nanocomposite adsorbent starting
from different biomasses.
Como referenciar
VIEIRA, LAÍS H.S.; SABINO, CARLA M.S.; SOARES JÚNIOR, FRANCISCO H.; ROCHA, JANAINA S.; CASTRO, MANUELA O.; ALENCAR, RAFAEL S.; COSTA, LUELC S. da; VIANA, BARTOLOMEU C.; PAULA, AMAURI J. de; SOARES, JOAO M.; SOUZA FILHO, ANTONIO G.; OTUBO, LARISSA; FECHINE, PIERRE B.A.; GHOSH, ANUPAMA; FERREIRA, ODAIR P. Strategic design of magnetic carbonaceous nanocomposites and its application as multifunctional adsorbent. Carbon, v. 161, p. 758-771, 2020. DOI: 10.1016/j.carbon.2020.01.089. Disponível em: http://repositorio.ipen.br/handle/123456789/31354. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.