物理化学学报 >> 2010, Vol. 26 >> Issue (11): 3080-3086.doi: 10.3866/PKU.WHXB20101108

材料物理化学 上一篇    下一篇

多壁碳纳米管的纯化及其表面含氧基团的表征

周金梅, 李海燕, 林国栋, 张鸿斌   

  1. 厦门大学化学化工学院,固体表面物理化学国家重点实验室,醇醚酯化工清洁生产国家工程实验室, 福建厦门361005
  • 收稿日期:2010-05-17 修回日期:2010-07-24 发布日期:2010-10-29
  • 通讯作者: 张鸿斌 E-mail:hbzhang@xmu.edu.cn
  • 基金资助:

    国家重点基础研究发展规划项目(973) (2009CB939804)和福建省重大科技专项专题项目(2009HZ0002-1)资助

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

ZHOU Jin-Mei, LI Hai-Yan, LIN Guo-Dong, ZHANG Hong-Bin   

  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:2010-05-17 Revised:2010-07-24 Published:2010-10-29
  • Contact: ZHANG Hong-Bin E-mail:hbzhang@xmu.edu.cn
  • Supported by:

    The project was supported by the National Key Basic Research Programof China (973) (2009CB939804) and Fujian Provincial Key Scientific & Technical Project, China (2009HZ0002-1).

摘要:

用兼具酸性和氧化性的HNO3水溶液可方便地除去残留在原生态多壁碳纳米管(CNT)上的Ni-MgO 催化剂组分, 同时在其表面产生某些含氧官能团, 使原生态多壁碳纳米管的疏水性表面变为亲水性表面. 采用Boehm 中和滴定法以及X 射线衍射(XRD)、热脱附谱(TPD)、傅里叶变换红外(FTIR)光谱和X 射线光电子能谱(XPS)等技术对HNO3处理过的多壁碳纳米管的相组成和表面含氧官能团进行测量和表征. 结果表明: 所生成表面含氧官能团的总量以经7.0 mol·L-1硝酸378 K处理24 h的CNT 为最高; 3 种主要表面含氧官能团的含量高低顺序为, 羧基>内酯型羧基>酚型羟基.

 

关键词: 多壁碳纳米管, 纯化, 表面含氧官能团, 表面修饰

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

MSC2000: 

  • O647