碳材料含氧官能团的合成方法研究

Study on Synthesis Methods of Oxygen-containing Functional Groups of Carbon Materials

异质原子掺杂会破坏碳材料sp2杂化骨架,不仅可以改变其电子结构,还引进很多缺陷位,从而提高表面化学活性并带来独特的磁性、光学及电化学性质。以商业石墨粉为原料,首先HNO3氧化处理,进而以有机合成机制为基础用KMnO4/H+或K2Cr2O7/H+进一步氧化或NaBH4还原,从而研究碳材料石墨化程度、含氧官能团种类和数量的改变。HNO3氧化对石墨结构没有明显改变,NaBH4对含氧官能团有一定的还原作用;KMnO4/H+或K2Cr2O7/H+氧化,石墨层间距变大,并引入大量含氧官能团。

The introduction of heteroatoms into carbon materials will lead to the destruction of the original sp2 hybrid carbon network of carbon materials,resulting in significant changes of electronic properties and introduction of tremendous defects,which improves the surface chemical activity and brings unique magnetic,optical and electrochemical properties.The commercial graphite powder was used as raw material,and oxidized treatment by HNO3 was carried out firstly.On the basis of organic synthesis mechanism,KMnO4/H+or K2Cr2O7/H+was used for further oxidation and NaBH4 for further reduction.The graphitization degree and oxygen-containing functional groups of as-synthesized carbon materials were studied by XRD,IR and Raman.It was found that HNO3 oxidation had no obvious effect on the structure of graphite,and NaBH4 had a certain reduction effect on the oxygen-containing functional groups.After treatment of KMnO4/H+or K2Cr2O7/H+,the layer spacing of carbon materials increased and abundant oxygen-containing functional groups were introduced.