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Graphene-Based Nanocomposites for Enhanced Pb2+ Adsorption

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Abstract:

The present paper describes an investigation of the adsorption of lead ions (Pb2+) on graphene-based nanocomposites obtained via exfoliation of hydrolyzed expanded graphite intercalation compound. Three types of these nanocomposites - suspension of graphene nanoplatelets (SGN), paste of multi-layered oxidized graphene (PMOG), and paste of few-layered oxidized graphene (PFOG) - were used to extract Pb2+ from 1,040 mg L-1 aqueous solutions of Pb (NO3)2, and the kinetic of the Pb2+ adsorption was studied. It was found that the kinetic data are best fitted by the pseudo-second-order model. The adsorption equilibrium was achieved within 30 min under normal conditions. The maximum Pb2+ adsorption capacity of SGN, PMOG and PFOG was found to be 457, 103 and 38 mg g-1, respectively. Considering the obtained results, it can be assumed that the phenolic and hydroxyl oxygen-containing functional groups located at the surface of the adsorption materials under study play an important role in the Pb2+ removal process.

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Nano Hybrids and Composites Vol. 13 View Preview

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Periodical:

Nano Hybrids and Composites (Volume 13)

Pages:

323-329

DOI:

https://doi.org/10.4028/www.scientific.net/NHC.13.323

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Online since:

January 2017

Authors:

Anastasiya E. Kucherova, Irina V. Romantsova*, Alexandr E. Burakov, Nariman R. Memetov, Mikhail N. Krasnyansky

Keywords:

Adsorption Kinetic, Correlation Coefficient, Lead Ions (Pb2+), Nanocomposites, Oxidized Graphene, Rate Constant

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