文章摘要
张冬,孙红娟,彭同江,刘波.氧化-离心法提纯微晶石墨及其机理[J].材料导报,2018,32(12):2051-2056
氧化-离心法提纯微晶石墨及其机理
Purification of Natural Microcrystalline Graphite by Oxidation Centrifugal Method and Its Mechanism
  
DOI：10.11896/j.issn.1005-023X.2018.12.021
中文关键词: 微晶石墨 氧化 离心 提纯
英文关键词: microcrystalline graphite, oxidation, centrifuge, purification
基金项目:国家自然科学基金(41272051；U1630132)；四川省科技厅项目(2017GZ0114)
作者单位E-mail
张冬 西南科技大学环境与资源学院,绵阳 621010
西南科技大学固体废物处理与资源化教育部重点实验室,绵阳 621010
西南科技大学矿物材料及应用研究所,绵阳 621010 		 
孙红娟 西南科技大学环境与资源学院,绵阳 621010
西南科技大学固体废物处理与资源化教育部重点实验室,绵阳 621010
西南科技大学矿物材料及应用研究所,绵阳 621010 		422137016@qq.com,sunhongjuan@swust.edu.cn 
彭同江 西南科技大学固体废物处理与资源化教育部重点实验室,绵阳 621010
西南科技大学矿物材料及应用研究所,绵阳 621010 		 
刘波 西南科技大学环境与资源学院,绵阳 621010
西南科技大学固体废物处理与资源化教育部重点实验室,绵阳 621010
西南科技大学矿物材料及应用研究所,绵阳 621010 		 
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中文摘要:
      以湖南郴州天然微晶石墨为原料,首次提出氧化-离心法提纯微晶石墨,采用改进Hummers法氧化微晶石墨,再对其进行离心处理,得到纯化的微晶氧化石墨(烯)。结果表明:微晶石墨经氧化处理后结构中键接上含氧官能团,层间域增大,微晶石墨集合体变得松散且集合体部分解理,粒度随着氧化程度的增加逐渐减小,经离心洗涤后可将杂质与微晶氧化石墨分离,从而获得纯度较高的微晶氧化石墨(烯)样品。通过对产物结构和成分的表征分析表明,氧化对微晶石墨集合体起到了化学解理作用,氧化程度越高,解理效果越明显。当微晶石墨与KMnO4质量比为1∶4时,可达到最佳提纯效果；提纯后微晶氧化石墨(烯的固定碳含量C固)为98.8%,挥发分占0.2%,灰分仅占1%,集合体基本完全解理,片径尺寸为1~2 μm。
英文摘要:
      The centrifugal separation and purification of microcrystalline graphite was carried out by using modified Hummers method with Hunan Chenzhou natural microcrystalline graphite as raw material. The result revealed that the oxygen-containing functional groups are bonded to the structure, the interlayer space are increased, the microcrystalline graphite aggregates become loose and the aggregates are partially dissociated after oxidizing, the particle size decreases gradually with the increase of the oxidation degree. After washing, the impurity can be separated from the microcrystalline oxidized graphite, and the graphite with high purity is obtained. Through the analysis of the structure and composition of the product, it shows that the oxidation plays a key role in the purification process. The oxidation has a chemical dissociation effect on the aggregates. The higher the oxidation degree is, the more obvious the dissociation effect is. When the mass ratio of microcrystalline graphite to KMnO4 is 1∶4, the best purification effect can be achieved. After purification, fixed carbon is 98.8%, volatile content is 0.2%, the ash content is only 1%, and the aggregates are completely dissociated, the diameter of the slices was 1—2 μm.
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