CAJ | 학술논문

以高锰酸钾、硫酸、天然鳞片石墨为原料,采用化学氧化法制备可膨胀石墨。通过调控体系初始氧化还原电位,并结合其膨胀容积值,探讨石墨氧化的最佳电位区间,采用扫描电镜及X射线衍射仪对样品进行表征。结果表明,当体系初始氧化还原电位为1340~1810 mV时,能够获得平均膨胀容积大于230 mL/g,最高300 mL/g的可膨胀石墨,扫描电镜及X射线衍射结果证实了此区间的合理性。此法避免了传统化学氧化法通过复杂正交实验来确定最佳工艺的弊端,可为实现可膨胀石墨制备的自动化和工业化生产提供重要的理论依据。
이고맹산갑、류산、천연린편석묵위원료,채용화학양화법제비가팽창석묵。통과조공체계초시양화환원전위,병결합기팽창용적치,탐토석묵양화적최가전위구간,채용소묘전경급X사선연사의대양품진행표정。결과표명,당체계초시양화환원전위위1340~1810 mV시,능구획득평균팽창용적대우230 mL/g,최고300 mL/g적가팽창석묵,소묘전경급X사선연사결과증실료차구간적합이성。차법피면료전통화학양화법통과복잡정교실험래학정최가공예적폐단,가위실현가팽창석묵제비적자동화화공업화생산제공중요적이론의거。
The initial redox potential is employed to control the quality of expandable graphite prepared from natural flake graphite by chemical oxidation using KMnO4 as oxidant and sulfuric acid as intercalation agent. The effects of the initial redox potential on the layer structure and the expansion volume of the expandable graphite are investigated by scanning electron microscopy and X-ray diffraction. Results show that there is an optimum initial redox potential range between 1 340 and 1 819 mV, at which the extent of graphite layer oxidation is moderate and the intercalation reaction is complete. Low-order graphite intercalation compounds are formed and a high expansion volume of the expandable graphite can be obtained in this potential range. The redox potential can be used as a quality control parameter for the industrial preparation of expandable graphite.