Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (4): 997-1004.doi: 10.3866/PKU.WHXB201602182

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Adsorption of Pb2+ and Cd2+ on Graphene Nanosheets Prepared Using Thermal Exfoliation

Bao-Qing LI1,Wen-Hui YUAN2,*(),Li LI3   

  1. 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
  • Received:2015-12-22 Published:2016-04-07
  • Contact: Wen-Hui YUAN
  • Supported by:
    the Presidential Foundation of Guangdong Vocational College of Environmental Protection Engineering in 2013, China (KY201303001) and National Natural Science Foundation of China(20976057)


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 words: Graphene, Thermal exfoliation, Characterization, Adsorption, Heavy metal ion


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