微波膨化钾-四氢呋喃-石墨层间化合物制备膨胀石墨

Preparation of expanded graphite by K-THF-GIC microwave expanding

为了开发一种在无硫酸介入下制备膨胀石墨的新工艺,达到无有害硫残余的目的,以钾-四氢呋喃-萘的有机络合物溶液为介质,用电化学法合成了钾-四氢呋喃-石墨层间化合物,并对其进行微波膨化。对膨化石墨表面形貌和结构进行了表征分析,探讨了钾-四氢呋喃-石墨层间化合物的电解插层机理。结果表明:钾同四氢呋喃的有机溶剂共嵌入石墨层间,且石墨层间化合物膨化后,钾与四氢呋喃在微波作用下迅速从石墨层间膨胀出来得到石墨微薄片,这些石墨薄片彼此叠合形成片层状外观,构成膨胀石墨良好的孔隙结构。

In order to find an effective process for fabricating graphite intercalation compound without sulfur,a ternary potassium-tetrahydrofuran-graphite intercalation compound （K-THF-GIC） was prepared successfully by electrochemical method and then bulked in a microwave oven.The surface morphology and structure of the graphite intercalation compound and expanded graphite were characterized.Moreover,the mechanism for the electrochemical preparation of ternary potassium-tetrahydrofuran-graphite intercalation compound was discussed.Results showed that potassium and tetrahydrofuran were embeded into the graphite intercalation and rapidly removed from K-THF-GIC during graphite expanding under microwave interaction.The expanded graphite microsections showed porous structure.