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

• ARTICLE • Previous Articles     Next Articles

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 E-mail:cewhyuan@scut.edu.cn
  • 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)

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

MSC2000: 

  • O643