Oxidation of graphite by different modified Hummers methods
Oxidation of graphite by different modified Hummers methods
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DOI：
10.1016/s1872-5805(17)60102-1
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发表时间：
2017-02-01
影响因子：
5.7
通讯作者：
Gryglewicz, Grazyna
中科院分区：
文献类型：
--
作者：
Muzyka, Roksana;Kwoka, Monika;Gryglewicz, Grazyna
通过不同版本的Hummers方法和通过用重铬酸钠氧化从商业石墨制备具有不同氧含量和规格的氧化石墨。采用元素分析（EA）、傅里叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）和X射线衍射（XRD）等分析手段，研究了氧化石墨的化学和结构特征。重铬酸盐氧化提供低氧固定，主要以羟基和环氧基团的形式。通过使用Hummers方法实现了更有效的氧化。使用的硝酸钠和2小时的反应时间导致最高的氧含量的氧化石墨，超过40重量%，和氧被发现是单和双硼化碳。SEM和XRD观察显示在这些条件下石墨层的高间距。这些结果证明，即使使用相同的氧化方法，也可以通过改变反应条件来定制氧化石墨的化学结构。
Graphite oxides with different oxygen contents and specifications were prepared from a commercial graphite by different versions of the Hummers method and by oxidation with sodium dichromate. The chemical and structural characteristics of the graphite oxides were studied by elemental analysis(EA), Fourier-transform infrared spectroscopy(FT-IR), X-ray photoelectron spectroscopy(XPS), scanning electron microscopy (SEM) and X-ray diffraction (XRD). Dichromate oxidation provided a low oxygen fixation, mainly in the form of hydroxyl and epoxy groups. A much more efficient oxidation was achieved by using the Hummers method. The use of NaNO3 and a reaction time of 2 h led to the highest oxygen content in the graphite oxide, over 40 wt%, and oxygen was found to be single- and double-borided to carbon. SEM and XRD observations showed a high spacing of the graphite layers under these conditions. These results prove that, even using the same oxidizing method, the chemical structure of graphite oxides can be tailored by changing reaction conditions.