聚乙烯亚胺功能化多壁碳纳米管的制备及对硫化氢气体的吸附性能

Functionalization of Multi-Walled Carbon Nanotubes Using Polyethyleneimine and Its Application in H_2S

采用聚乙烯亚胺(PEI)对多壁碳纳米管(MWCNTs)进行功能化,并用红外、热失重、拉曼对聚乙烯亚胺改性的碳纳米管进行表征,红外光谱和热失重曲线表明聚乙烯亚胺成功键合到多壁碳纳米管上,拉曼光谱中碳纳米管的D/G比(D峰面积比G峰面积)从0.8398变成1.2364,说明碳纳米管的缺陷程度明显增加,这种缺陷的增加是由碳纳米管表面引入了PEI导致的。利用紫外吸收光谱探究聚乙烯亚胺功能化的多壁碳纳米管(MWCNTs-PEI)对硫化氢的吸收及其可逆性。MWCNTs-PEI对硫化氢的首次吸收效率为0.16 mmol/g,2次重复吸收后仍有0.13 mmol/g的吸收效率,说明MWCNTs-PEI能够对硫化氢起到吸收作用并且具有很好的可逆性。

Functionalization of multi-walled carbon nanotubes using polyethyleneimine. The functionalized MWCNTs was characterized by FT-IR, Raman spectrum （RM） and thermal gravimetric analysis （TGA）. Both FT-IR and TGA prove that polyethyleneimine and MWCNTs are successfully bonded with each other through chemical bond. Raman spectral data show that compared with MWCNTs, the D：G ratio of functionalized MWCNTs increases from 0. 8398 to 1. 2364. This increase in the D： G ratio indicates that the defect of MWCNTs is obvious augmented which is caused by polyethyleneimine bonding with MWCNTs. The H2S absorption and reversibility of MWCNTs-PEI were studied by UV spectrum. The H2S absorption efficiency is 0.16 mmol/g for the first time by MWCNTs-PEI and the absorption efficiency is still 0.13 mmol/g for the third time. It turns out that MWCNTs-PEI could absorb hydrogen sulfide and have an excellent reversibility.