Surface area control of nanocomposites Mg(OH)2/graphene using a cathodic electrodeposition process: high adsorption capability of methyl orange

The nanocomposites Mg(OH) 2 /graphene (nano-MG) were controllably prepared by a facile cathodic electrodeposition. The samples were characterized by field emission scanning electron microscopy with energy dispersive spectroscopy (FSEM-EDS), X-ray diffraction (XRD), Raman spectroscopy, thermogravimet...

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Bibliographic Details
Published in:RSC advances 2016, Vol.6 (91), p.88315-8832
Main Authors: Deng, X. Z, Wang, Y. W, Peng, J. P, Liu, K. J, Feng, N. X, Di, Y. Z
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Current density
Electrodeposition
Graphene
Nanostructure
Specific surface
Surface chemistry
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Summary:The nanocomposites Mg(OH) 2 /graphene (nano-MG) were controllably prepared by a facile cathodic electrodeposition. The samples were characterized by field emission scanning electron microscopy with energy dispersive spectroscopy (FSEM-EDS), X-ray diffraction (XRD), Raman spectroscopy, thermogravimetric analysis (TGA), N 2 adsorption-desorption analysis and UV-vis spectrophotometry. Characterization results suggested that Mg(OH) 2 and graphene were combined successfully. Furthermore, the effects of the current density on the specific surface area of nano-MG have been investigated systematically. The specific surface area of nano-MG varied from 110 m 2 g −1 to 525 m 2 g −1 , indicating that a suitable current density (0.07 A cm −2 ) is favorable for the uniform growth of Mg(OH) 2 on the surface of graphene. In addition, the nano-MG (0.425 wt% graphene) with a specific surface area of 525 m 2 g −1 was used as an adsorbent to remove Methyl Orange (MO) from water. The results showed that the adsorption of MO onto nano-MG exhibited a maximum adsorption capacity of 1.074 g g −1 . Desorption experiments were carried out to explore the feasibility of adsorbent regeneration. And the possible mechanism responsible for electrodeposition and adsorption of MO on nano-MG were also elucidated. The nanocomposites Mg(OH) 2 /graphene (nano-MG) were controllably prepared by a facile cathodic electrodeposition.
ISSN:2046-2069
2046-2069
DOI:10.1039/c6ra15804h