Hybrid magnetic nanoparticles for wet peroxide oxidation of paracetamol
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abstract
A performance de nanopartículas de ferrite de cobalto, ferrite de cobalto recoberta por carbono preparada por
uma metodologia tradicional e ferrite de cobalto preparada por metodologia verde foi avaliada na remoção de
paracetamol (PCM), escolhido como poluente modelo, por um processo de oxidação húmida com peróxido de
hidrogénio (CWPO). O núcelo magnético foi sintetizado por sol-gel, e na metodologia tradicional de
recobrimento de carbono foi considerado resorcinol/formaldeído como precursores de carbono, enquanto que
na metodologia verde foi considerado phloroglucinol/ácido glioxílico. Todas as nanopartículas magnéticas
(NPMs) apresentaram atividade na remoção de PCM por CWPO. Ambas as NPMs recobertas com carbono
apresentaram resultados melhores que o núcleo não recoberto, devido à presença da camada de carbono à volta
do núcleo, que também tem atividade pelas propriedades eletrónicas do recobrimento de carbono. O catalisador
recoberto pela metodologia verde possui uma decomposição de peróxido de hidrogénio mais controlada. O
teste de reutilização do catalisador mostrou a estabilidade do material, com perfis de concentração similares e
uma remoção de PCM mais rápida que na primeira utilização
Adriano S. Silva thanks his doctoral Grant with
reference SFRH/BD/151346/2021 financed by the
Portuguese Foundation for Science and
Technology (FCT), with funds from NORTE2020,
under MIT Portugal Program. Fernanda F. Roman
acknowledges the national funding by FCT
through the individual research grant
SFRH/BD/143224/2019. This work was
financially supported by UIDB/00690/2020
(CIMO), LA/P/0045/2020 (ALiCE),
UIDB/50020/2020 (LSRE-LCM), and the project
RTChip4Theranostics, with the reference NORTE-
01-0145-FEDER-029394. Jose L. Diaz De Tuesta
acknowledges the financial support through the
program of “Atracción al Talento” of “Comunidad
de Madrid” (Spain) for the individual research
grant 2020-T2/AMB-19836.
The performance of non-coated magnetic nanoparticle (MNPs) based on cobalt ferrite (CoFe2O4), and of
carbon-coated cobalt ferrite prepared by a traditional method (CoFe2O4@C1), and by a greener method
(CoFe2O4@C2) was assessed in the removal of paracetamol (PCM), used as model pharmaceutical pollutant,
by catalytic wet peroxide oxidation (CWPO). The magnetic core was synthesized by sol-gel methodology, and
the traditional method for carbon coating considered resorcinol and formaldehyde as carbon precursors. In
contrast, the greener method was performed considering phloroglucinol and glyoxylic acid as carbon
precursors. All MNPs presented activity on the removal of PCM by CWPO. Both carbon-coated MNPs
overcome the results obtained with the bare core, due to the carbon layer covering the core, which can also
have catalytic activity. The catalyst coated by the greener method (CoFe2O4@C2) shows a more controlled
decomposition of hydrogen peroxide. A reutilization test performed to evaluate the stability of this catalyst
showed complete removal of PCM faster than in the first usage, with a similar concentration trend profile in
both repetitions.
