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Journal of Chemistry
Volume 2014, Article ID 678151, 5 pages
http://dx.doi.org/10.1155/2014/678151
Research Article

Preparation and Its Adsorptive Property of Modified Expanded Graphite Nanomaterials

1Hebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China
2State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
3College of Mechanical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China

Received 6 November 2013; Revised 8 January 2014; Accepted 9 January 2014; Published 12 February 2014

Academic Editor: Lavinia Balan

Copyright © 2014 Liqin Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Modified expanded graphite (MEG) samples were prepared by strong acid treatment modification. As-prepared MEG samples were characterized by the means of FE-SEM, XRD, FT-IR, N2 physical adsorption measurements, and TG-DTA. The influences of expanded volume and oil viscosity on adsorptive property of MEG samples were investigated. The results suggest that MEG samples have high crystallinity. The pores of MEG samples can be divided into three levels from FE-SEM images. All of the functional groups of MEG samples are nonpolar. The expansion temperature of modified expansible graphite starts at about 700°C. The sorption capacity of MEG increases gradually with expanded volume and oil viscosity increase. When the expanded volume of MEG samples is 320 mL/g, its maximum sorption capacity is up to 84.681 g/g for gear oil with the highest viscosity.