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Hexavalent chromium induced tunable surface functionalization of graphite

机译：六价铬诱导石墨的可调表面官能化

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Hexavalent chromium (Cr( VI )) was chosen to serve as an oxidant to functionalize the surface of graphite. The effect of pH and concentration of Cr( VI ) solution on the functionalization of graphite was systematically investigated by Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS). The results showed that the ether (C–O–C) functional groups were observed on the surface of graphite after being treated with pH = 1.0 solution with a Cr( VI ) concentration of 1000 μg L ~(?1) for 30 min. However, no obvious functional groups were observed on the graphite surface for the pH higher than 2.0 and the Cr( VI ) concentrations higher than 2.0 mg L ~(?1) . The electrical conductivity of functionalized graphite by Cr( VI ) was observed to be good, i.e. , the same order of magnitude as that of the as-received graphite without a serious decrease. This work provides a new strategy to functionalize graphite for preparing multifunctional graphite nanocomposites.
机译：选择六价铬（Cr（VI））用作氧化剂，以使石墨表面官能化。通过拉曼光谱，傅立叶谱分析，傅里叶变换红外光谱（FT-IR），热重分析（TGA）和X射线光电子谱（XP）系统地研究了Cr（VI）溶液对石墨官能化的影响。结果表明，在用pH = 1.0溶液处理后，在石墨表面上观察到醚（C-O-C）官能团，其Cr（vi）浓度为1000μgl〜（α1），持续30分钟。然而，在高于2.0的pH高于2.0的石墨表面上没有观察到明显的官能团，并且Cr（VI）浓度高于2.0mg L〜（α1）。观察到Cr（VI）的官能化石墨的导电性是良好的，即，与接收的石墨的相同数量级，没有严重减少。这项工作提供了一种新的策略来使石墨制备多功能石墨纳米复合材料。

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