Citation: 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 Physico-Chimica Sinica, ;2010, 26(11): 3080-3086. doi: 10.3866/PKU.WHXB20101108 shu

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

1.
College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry for Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, Xiamen University, Xiamen 361005, Fujian Province, P. R. China

Received Date: 17 May 2010
Available Online: 13 September 2010
Fund Project: 国家重点基础研究发展规划项目(973) (2009CB939804) (973) (2009CB939804)福建省重大科技专项专题项目(2009HZ0002-1)资助 (2009HZ0002-1)

We conveniently removed the Ni-M 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.
- Multiwalled carbon nanotubes,
- Purification,
- Oxygen-containing surface group,
- Surface modification
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