Effect of the Oxidation of Carbon Nanotubes on Its Properties of Re-adsorption.

MWCNTs was oxidized by the oxidation system (V( H2SO4 : V( HNO3 = 3:1. In order to study the properties of re-adsorption, different reflux time was used to get different amounts of oxygen containing functional groups. The structure of the sample was characterized by Fourier transform infrared spectroscopy (FITR $, scanning electron microscope (SEM $ and BET nitrogen adsorption method. The results show that a large amount of reactive functional groups such as carboxyl was obtained on the surface of the MWCNTs. The pore structure and dispersity of the MWCNTs was changed after the oxidization. The most suitable oxidative reflux time was 1.5 h. And in this condition, the O-MWCNTs has the highest equilibrium re-adsorption water content (493% $ . The properties of re-adsorption and the amount of oxygen containing functional groups present certain positive correlation. So we realized that the oxygen containing functional group was very important to influence the properties of re-adsorption. [ABSTRACT FROM AUTHOR]