| 微晶石墨氧化-膨胀过程中微形貌与结构变化 |
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| 引用本文： | 孙红娟,刘波,彭同江,段佳琪.微晶石墨氧化-膨胀过程中微形貌与结构变化[J].地球科学,2018,43(5):1481-1488. |
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| 作者姓名： | 孙红娟 刘波 彭同江 段佳琪 |
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| 作者单位： | 1.西南科技大学固体废物处理与资源化教育部重点实验室, 四川绵阳 621010 |
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| 基金项目： | 西南科技大学龙山学术人才科研支持计划17LZXT11国家自然科学基金项目41772036国家自然科学基金项目U1630132 |
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| 摘 要： | 为深度揭示微晶石墨氧化和膨胀过程中结构的变化规律，分别采用SEM-EDS、XRD、Raman和FTIR等测试分析手段对其产物结构进行表征研究.结果表明:微晶石墨经氧化后，层间域被撑大，结构层上接入大量的羟基、羧基和环氧基等亲水性含氧官能团.随氧化剂（KMnO4）用量增加，产物层间距、结构缺陷和无序度逐渐增大.高温膨胀后，氧化微晶石墨被还原，结构中的部分吸附水和含氧官能团被除去，结构缺陷与无序度减小，部分sp2区域得到了恢复.膨胀微晶石墨颗粒含有丰富的网络型孔隙结构，孔径集中在2~5 nm.
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| 关 键 词： | 微晶石墨 氧化 膨胀 结构 矿物学 |
| 收稿时间： | 2017-10-01 |
Micromorphology and Structure Changes of Microcrystalline Graphite during Process of Oxidation and Expansion |
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| Abstract: | In order to reveal the structure changes of microcrystalline graphite in the process of oxidation and expansion, the products were characterized by means of SEM-EDS, XRD, Raman and FTIR in this study. The results show that the interlayer distance of microcrystalline graphite oxide is enlarged and many functional groups including hydroxyl, carboxyl and epoxy groups are bonded on the graphene layer in the oxidation process. In addition, with the increase of oxidant (KMnO4), the space distance, structural defects and disorder of oxidized product increased gradually. After being expanded with high temperature, some of the oxygen-containing functional groups in the structure were removed, and the oxidized microcrystalline graphite was reduced partly. In addition, the structural defects and disorder degrees of expanded microcrystalline graphite reduced, and local sp2 regions were recovered. The expanded microcrystalline graphite particles contained abundant network pore structures with pore sizes of 2-5 nm. |
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