利用TG-MS研究NO气体在酰胺化碳纳米管吸附-脱附的性能

摘要

Multi-walled carbon nanotubes (MCNTs) were modified by 3-aminopropyltriethoxysilane. The modified MCNTs were characterized by FT-IR and Raman spectral. The results show that the structure of modified carbon nanotubes were unchanged. The mechanism of NO adsorption-desorption of multi-walled carbon nanotubes was studied by TG-MS. The adsorption isothermal curve by TG indicated that the adsorption of capacity of amide-multiwalled carbon nanotubes are 3 times higher than that of unmodified multi-walled carbon nanotubes under certain temperature condition. The desorption isothermal curve by TG-DTG showed that NO desorption of modified carbon nanotubes has more temperature points. At the same time,the result of the situ MS confirms this conclusion. Moreover the effect of temperature on adsorption property was studied. The result indicated that temperature has a great influence on adsorption capability. The best temperature of amide-multi-walled carbon nanotubes is 100℃ for NO adsorption.%　　采用化学修饰的方法，用偶联剂3-氨基丙基三乙氧基硅烷（APTEs）对多壁碳纳米管进行酰胺化，并采用红外光谱和拉曼光谱对其结构进行表征，研究结果表明，用偶联剂修饰后的碳纳米结构并未发生改变。同时采用原位TG-MS技术研究了NO在多壁碳纳米管的吸附和脱附行为，TG等温吸附曲线结果表明，在温度一定的条件下，酰胺化多壁碳纳米管对NO的吸附量为未改性多壁碳纳米管的3倍；TG-DTG的等温脱附曲线实验研究表明，NO在酰胺化多壁碳纳米管脱附的温度点较多，同时其原位MS实验结果进一步印证了这一结论。另外考察了温度对碳纳米管吸附NO性能的影响，实验结果表明吸附温度对NO在多壁碳纳米管上的吸附量有较大的影响，酰胺化多壁碳纳米管对NO的最佳吸附温度为100℃。