SÍNTESE E CARACTERIZAÇÃO DE ÓXIDO DE GRAFENO E ÓXIDO DE GRAFENO REDUZIDO PARA APLICAÇÃO AMBIENTAL
Resumo
O presente trabalho apresenta a síntese via método Hummers de óxido de grafeno a partir de duas formas de grafites, em pó e em flakes. Ainda, é apresentada a redução química do óxido de grafeno produzido com a forma de grafite mais eficiente. Os grafites precursores, assim como os óxidos de grafeno e óxido de grafeno reduzido produzidos foram caracterizados através das técnicas de difração raios X e espectroscopia Raman. A rota de síntese utilizada se apresentou bastante eficiente, obtendo-se nanomateriais com alto grau de oxidação e esfoliação. No que diz respeito a forma do grafite precursor, o grafite em pó se mostrou mais indicado para a síntese de óxido de grafeno. Isso se deve, provavelmente, a maior facilidade nas etapas de oxidação e esfoliação do material. A partir das caracterizações, é possível verificar que o óxido de grafeno sintetizado com o pó de grafite possui boa qualidade. Ainda, a partir do óxido de grafeno oriundo do pó de grafite, foi possível obter óxido de grafeno reduzido utilizando borohidreto de sódio com redutor. Vale ressaltar que os nanomateriais aqui produzidos possuem grande potencial para aplicações como adsorventes no tratamento de efluentes contaminados com contaminantes emergentes.
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Referências
M. Lithiumaluminumhydride as reducingagent for
chemicallyreduced graphene oxides. Chemistry of Materials,
v.24, p.2292-2298, 2012.
BERGMANN, C.P.; MACHADO, F.M. Carbon nanomaterials
as adsorbents for environmental and biological applications.
New York City: Springer International Publishing, 2015.
BLANTON, T.N.; MAJUMDAR, D. X-ray diffraction
characterization of polymer intercalated graphite oxide. Powder
Diffraction, v. 27, p. 104-107, 2012.
CHOWDHURY, S.; BALASUBRAMANIAN, R. Recent
advances in the use of graphene-family nanoadsorbents for
removal of toxic pollutants from wastewater. Advances in
Colloid and Interface Science, v.204, p.35-56, 2014.
ERSAN, G.; KAYA, Y.; APUL, O. G.; KARANFIL, T.
Adsorption of organic contaminants by graphene nanosheets,
carbon nanotubes and granular activated carbons under natural
organic matter preloading conditions. Science of the Total
Environment. v. 565, p. 811-817, 2016.
FERRARI, A. C.; BASKO, D. M. Raman spectroscopy as
a versatile tool for studying the properties of graphene. Nat
Nanotechnol, v. 8, n. 4, p. 235–246, 2013.
GEIM, A. K.; NOVOSELOV, K. S. The rise of graphene. Nature
Materials, v. 6, p. 183-191, 2007.
JAURIS, I.M.; MATOS, C.F.; SAUCIER, C.;et al. Adsorption
of sodium diclofenac on graphene: a combined experimental and
theoretical study. Physical Chemistry Chemical Physics, v.18,
p.1526-1536, 2016.
KEMP, K.C.; SEEMA, H.; SALEH, M.; et al. Environmental
applications using graphene composites: water remediation and
gas adsorption. Nanoscale, v.5, p.3149-3171, 2013.
KWON, J.; LEE, B. Bisphenol A adsorption using reduced
graphene oxide prepared by physical and chemical reduction
methods. Chemical Engineering Research and Design, v. 104,
p. 519-529, 2015.
KUDIN, K. N.; OZBAS, B.; SCHNIEPP, H. C.; et al. Raman
spectra of graphite oxide and functionalized graphene sheets.
Nano Letters, v. 8, n. 1, p. 36–41, 2008.
LI, W.; YANG, Y. J. J. The reduction of graphene oxide by
elemental copper and its application in the fabrication of graphene
supercapacitor. Journal of Solid State Electrochemistry, v.18,
24 Avila et al
Revista Brasileira de Engenharia e Sustentabilidade, v.3, n.1, p.19-24, abr. 2017.
p.1621-1626, 2014.
MACHADO, F.M.; BERGMANN, C.P.; FERNANDES,
T.H.M.; et al. Adsorption of reactive red M-2BE dye from
water solutions by multi-walled carbon nanotubes and activated
carbon. Journal of Hazardous Materials, v.192, p.1122-1131,
2011.
MACHADO, F. M.; BERGMANN, C. P.; LIMA, E. C.; et
al. Adsorption of Reactive Blue 4 dye from water solutions by
carbon nanotubes: experiment and theory. Physical Chemistry
Chemical Physics, v. 14, p. 11139-11153, 2012.
MACHADO, F. M.; CARMALIN, S. A.; LIMA, E. C.; et al.
Adsorption of Alizarin Red S Dye by Carbon Nanotubes: An
Experimental and Theoretical Investigation. Journal of Physical
Chemistry C, v. 120, p. 18296-18306, 2016.
SUI, Z.; MENG, Q.; ZHANG, X.; et al. Green synthesis of
carbon nanotube-graphene hybrid aerogels and their use as
versatile agents for water purification. Journal of Materials
Chemistry, v.22, p.8867-8771, 2012.
PETRIE B., BARDEN R, KASPRZYK-HORDERN B. A review
on emerging contaminants in wastewaters and the environment:
Current knowledge, understudied areas and recommendations
for future monitoring. Water Research, v. 72, p. 3-27, 2015.
PIMENTA M.; DRESSELHAUS, G; DRESSELHAUS,
M.; et al. Study disorder in graphite-based systems by Raman
spectroscopy. Physical Chemistry Chemical Physical, v. 9, p.
1276-1290, 2007.
ROSTAMIAN, R.; BEHNEJAD, H. Comparative adsorption
study of sulfamethoxazole onto graphene and graphene oxide
nanosheets through equilibrium, kinetic and thermodynamic
modeling. Process Safety and Environmental Protection, v.
102, p. 20-29, 2016.
SOIN, N; ROY, S; O’KANE, C.; et al. Exploring the
fundamental effects of deposition time on the microstructure of
graphene nanoflakes by Raman scattering and X-ray diffraction.
CrystEngComm, v. 13, p. 312-318, 2011.
