热剥离法制备石墨烯纳米片对Pb2+和Cd2+的吸附

doi:10.3866/PKU.WHXB201602182

Abstract

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

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

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

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