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Lee, Changha
Advanced Redox Technology (ART) Lab
Research Interests
  • Water Treatment, Advanced Oxidation/Reduction, Water Chemistry, Environmental Catalyst

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Synthesis of graphene-carbon sphere hybrid aerogel with silver nanoparticles and its catalytic and adsorption applications

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Title
Synthesis of graphene-carbon sphere hybrid aerogel with silver nanoparticles and its catalytic and adsorption applications
Author
Dubey, Shashi PrabhaDwivedi, Amarendra DharKim, In-ChulSillanpaa, MikaKwon, Young-NamLee, Changha
Keywords
Adsorption; Aerogel; Carbon sphere; Catalytic reduction; Graphene
Issue Date
201405
Publisher
ELSEVIER SCIENCE SA
Citation
CHEMICAL ENGINEERING JOURNAL, v.244, no., pp.160 - 167
Abstract
In this study, we report the fabrication of a graphene-carbon sphere hybridaerogel decorated with silver nanoparticles (G/AgCS). Graphene oxide (GO) and carbon spheres doped with silver nanoparticles (AgCS) were prepared separately. G/AgCS hydrogel was then synthesized by induced reduction and gelation of a mixture of GO and AgCS in an oil bath. The G/AgCS aerogel was obtained by freeze drying the hydrogel. The synthesized G/AgCS aerogel was characterized using field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Raman and infra-red spectroscopy. The G/AgCS showed promising efficacy for the catalytic reduction of 4-nitrophenol in the presence of NaBH4. The catalytic activity did not significantly decrease during more than 10 cycles of the catalytic reaction. The adsorption capability of chromium(VI), uranium(VI), and methylene blue on the G/AgCS aerogel was also evaluated using a Langmuir isotherm model in comparison to commercial activated carbons.
URI
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DOI
http://dx.doi.org/10.1016/j.cej.2014.01.042
ISSN
1385-8947
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