多壁碳纳米管的纯化及其表面含氧基团的表征

doi:10.3866/PKU.WHXB20101108

Abstract

Abstract:

We conveniently removed the Ni-MgO catalyst components from an as-grown multiwalled carbon nanotube (CNT) using an aqueous HNO₃ solution with strong acidity and oxidizability as a purifying reagent. Some oxygen-containing surface groups were generated at the CNT surface, which converted the hydrophobic surface into a hydrophilic surface. The phase composition and the oxygen-containing surface groups of the CNTs treated by nitric acid were determined and characterized using Boehm's neutralizing titration method and X-ray powder diffraction (XRD), temperature-programmed desorption (TPD), Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS) techniques. The results indicated that the total content of the formed oxygen-containing surface groups was the highest for the CNTs treated with 7.0 mol·L^-1 aqueous HNO₃ at 378 K for 24 h. The content of the three major oxygen-containing surface groups was: carboxyl>lactonic carboxyl>phenolic hydroxyl.

Key words: Multiwalled carbon nanotubes, Purification, Oxygen-containing surface group, Surface modification

ZHOU Jin-Mei, LI Hai-Yan, LIN Guo-Dong, ZHANG Hong-Bin. Purification of Multiwalled Carbon Nanotubes and Characterization of Their Oxygen-Containing Surface Groups[J]. Acta Phys. -Chim. Sin. 2010, 26(11), 3080-3086. doi: 10.3866/PKU.WHXB20101108

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Purification of Multiwalled Carbon Nanotubes and Characterization of Their Oxygen-Containing Surface Groups

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