Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
Langmuir. 2011 Jun 21;27(12):7558-62. doi: 10.1021/la200606r. Epub 2011 May 19.
Graphene nanosheets (GNSs) that were obtained by vacuum-promoted low-temperature exfoliation were used to adsorb lead ions from an aqueous system. The pristine and thermally modified GNSs were characterized with scanning electron microscopy observation and X-ray photoelectron spectroscopy analysis. It was interestingly found that the adsorption against lead ions was enhanced by heat treatment, although the oxygen complexes of GNSs showed a significant decrease. In addition, lead ion uptake resulted in an increase in the pH value of the solution. It is supposed that the Lewis basicity of GNSs is improved by heat treatment under a high vacuum, in favor of simultaneous adsorption of lead ions and protons onto GNSs.
采用真空促进的低温剥离法得到的石墨烯纳米片（GNSs）用于从水溶液中吸附铅离子。对原始和热改性的 GNSs 进行了扫描电子显微镜观察和 X 射线光电子能谱分析。有趣的是，尽管 GNSs 的含氧复合物显著减少，但热处理增强了对铅离子的吸附。此外，铅离子的摄入导致溶液 pH 值升高。据推测，在高真空下进行热处理会提高 GNSs 的路易斯碱度，有利于铅离子和质子同时吸附到 GNSs 上。
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