Reduced graphene oxide-metal/metal oxide composites: facile synthesis and application in water purification

Sreeprasad, T. S. ; Maliyekkal, Shihabudheen M. ; Lisha, K. P. ; Pradeep, T. (2011) Reduced graphene oxide-metal/metal oxide composites: facile synthesis and application in water purification Journal of Hazardous Materials, 186 (1). pp. 921-931. ISSN 0304-3894

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.jhazmat.2010.11.100

Abstract

This paper describes a versatile, and simple synthetic route for the preparation of a range of reduced graphene oxide (RGO)-metal/metal oxide composites and their application in water purification. The inherent reduction ability of RGO has been utilized to produce the composite structure from the respective precursor ions. Various spectroscopic and microscopic techniques were employed to characterize the as-synthesized composites. The data reveal that the RGO-composites are formed through a redox-like reaction between RGO and the metal precursor. RGO is progressively oxidized primarily to graphene oxide (GO) and the formed metal nanoparticles are anchored onto the carbon sheets. Metal ion scavenging applications of RGO-MnO2 and RGO-Ag were demonstrated by taking Hg(II) as the model pollutant. RGO and the composites give a high distribution coefficient (Kd), greater than 10Lg-1 for Hg(II) uptake. The Kd values for the composites are found to be about an order of magnitude higher compared to parent RGO and GO for this application. A methodology was developed to immobilize RGO-composites on river sand (RS) using chitosan as the binder. The as-supported composites are found to be efficient adsorbent candidates for field application.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Adsorption; Reduced Graphene Oxide Composites; Mercury; Supported Composites; Water Purification
ID Code:82420
Deposited On:10 Feb 2012 12:56
Last Modified:10 Feb 2012 12:56

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