氧化处理方法与多壁碳纳米管表面羧基含量的关系

摘要: 从羧基定量化出发，采用红外光谱法、热重分析法和X射线光电子能谱法详尽研究了氧化处理方法与多壁碳纳米管(MWCNT)上引入羧基量的关系。结果表明，硝酸氧化法、混酸氧化法和混酸与过氧化氢共同氧化法均可以使MWCNTs表面产生羧基。热重分析法和XPS分析法可以定量分析MWCNTs表面羧基的含量，并且分析结果相近。XPS分析表明，2.5mol/L硝酸氧化48h可以使MWCNTs表面产生摩尔分数为4.80%的—COOH，而混酸（浓HNO3与浓H2SO4体积比为1∶3）氧化4h可产生摩尔分数为5.35%的—COOH，如果进一步由质量分数20%的过氧化氢氧化2h，MWCNTs表面产生的—COOH摩尔分数提高到7.55%。

Abstract: Carboxylic groups were produced on the surface of MWCNTs by oxidation treatment. Carboxylic group contents were quantitively analyzed by FTIR, TGA and XPS. Results show that TGA and XPS analysis give similar carboxylic group contents on the surface of MWCNTs. For 2.5mol/L nitric acid oxidation for 4h, mixed acid oxidation for 4h, and mixed acid oxidation for 4h and then 20% H2O2 oxidation for 2h, 4.80, 5.35 and 7.55mol% of carboxylic groups on the were respectively produced.