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Acta Phys. -Chim. Sin.  2016, Vol. 32 Issue (4): 997-1004    DOI: 10.3866/PKU.WHXB201602182
ARTICLE     
Adsorption of Pb2+ and Cd2+ on Graphene Nanosheets Prepared Using Thermal Exfoliation
Bao-Qing LI1,Wen-Hui YUAN2,*(),Li LI3
1 The Key Laboratory of Heavy Metal Pollution Prevention and Soil Remediation, Guangdong Vocational College of Environmental Protection Engineering, Foshan 528216, Guangdong Province, P. R. China
2 School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
3 College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510640, P. R. China
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Abstract  

Graphene nanosheets (GNSs) were prepared using oxidation of graphite powder followed by rapid thermal exfoliation under a nitrogen atmosphere. The as-prepared samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, and Fourier transform infrared (FT-IR) spectroscopy. The specific surface area was determined using the nitrogen adsorption and desorption method. These analytic techniques revealed that the samples possessed a curled morphology consisting of a thin paper-like structure, which was made of a few graphite layers (approximately four layers) and a large specific surface area (628.5 m2·g-1). The effects of pH, adsorption time, temperature and initial concentration of Pb2+ and Cd2+ on adsorption onto the GNSs were investigated. The maximum adsorption capacities of GNSs for Pb2+ and Cd2+ ions were approximately 460.20 and 72.39 mg·g-1, respectively. These results indicate that the resulting high-quality GNSs can be used as an attractive adsorptive material for removing Pb2+ and Cd2+ from water.



Key wordsGraphene      Thermal exfoliation      Characterization      Adsorption      Heavy metal ion     
Received: 22 December 2015      Published: 18 February 2016
MSC2000:  O643  
Fund:  the Presidential Foundation of Guangdong Vocational College of Environmental Protection Engineering in 2013, China (KY201303001) and National Natural Science Foundation of China(20976057)
Corresponding Authors: Wen-Hui YUAN     E-mail: cewhyuan@scut.edu.cn
Cite this article:

Bao-Qing LI,Wen-Hui YUAN,Li LI. Adsorption of Pb2+ and Cd2+ on Graphene Nanosheets Prepared Using Thermal Exfoliation. Acta Phys. -Chim. Sin., 2016, 32(4): 997-1004.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201602182     OR     http://www.whxb.pku.edu.cn/Y2016/V32/I4/997

 
 
 
 
 
 
 
 
 
AdsorbentMetal ionpHAdsorption capacity/(mg·g-1)Reference
CNTPb2+ 5.0102.4 45
CNTPb2+ 5.097.0846
acidified CNTPb2+ 5.085.047
GNSC8PPb2+ 5.174.1844
GNSPF6Pb2+ 5.1405.944
EDTA-GOPb2+6.847921
GNSPb2+5.5460.2this work
CNTCd2+ 5.010.8646
oxidized CNTCd2+ 5.511.048
GNSC8PCd2+ 6.230.0544
GNSPF6Cd2+ 6.273.4244
ARGCd2+ 5.052.449
GOCd2+ 5.783.823
GNSCd2+ 6.172.39this work
 
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