Coaly graphite is an important natural graphite resource that derived from coal under a natural process that associated with igneous intrusion. Flake graphite is usually used for the chemical synthesis of graphene oxide (GO), the main precursor for preparation of graphene, but few papers pay attention to preparing GO using coaly graphite. In this paper, four kinds of natural coaly graphite with different graphitization degrees were exposed to a modified Hummer’s oxidation method to prepare GO. The flake graphite sample was also used for comparison. The results showed that the structural change process from graphite to GO were significantly affected by the graphitization degree of the original coaly graphite. The relationship between yields of GO and graphitization degrees of the coaly graphite was explored. The mechanism of why the graphite with low graphitization degrees cannot be totally oxidized was proposed. Coaly graphite with a graphitization degree of higher than 80% was easier to be oxidized and yielded the same amount of GO as the flake graphite did, suggesting it is the potential substitute for the flake graphite to produce GO in bulk quantities.

煤石墨是一种重要的天然石墨资源，它是通过与火成岩侵入相关的自然过程从煤中提取的。片状石墨通常用于化学合成氧化石墨烯（GO），这是制备石墨烯的主要前体，但很少有论文关注使用煤状石墨制备GO。本文对四种石墨化程度不同的天然煤石墨进行改进的悍马氧化法制备GO。片状石墨样品也用于比较。结果表明，原始煤状石墨的石墨化程度显着影响了石墨向GO的结构转变过程。探讨了GO的收率与煤状石墨的石墨化程度之间的关系。提出了为什么石墨化度低的石墨不能被完全氧化的机理。石墨化度高于80％的煤状石墨更容易被氧化并产生与鳞片石墨相同数量的GO，这表明它是鳞片石墨批量生产GO的潜在替代品。