Modified Multi-walled Carbon Nanotubes And No Adsorption - Desorption

In this article, muli-walled carbon nanotubes modified by KOH,β-Cyclodextrin , and doped with B or N have been synthesized. The samples are characterized by SEM, TG-MS, XRD, FT-IR, Raman and XPS. The results demonstrate that the BET surface area of MWCNTs activated by KOH is higher than those of unactivated MWCNTs. And SEM images show that MWCNTs activated by KOH becomes shorter and straighter. While MWCNTs were modified withβ-Cyclodextrin,β-Cyclodextrin enwrapped the surface of MWCNTs. MWCNTs activated by KOH and modified byβ-Cyclodextrin were characterized by the means of XRD and Raman, it was found the structure of the MWCNTs didn't changed. The results of NO adsorption-desorption showed that the adsorption of NO of MWCNTs activated by KOH and modified byβ-Cyclodextrin are obviously higher than that of MWCNTs. Because of the larger BET surface area of MWCNTs activated by KOH, therefore the NO adsorption capability of MWCNTs activated by KOH was improved; andβ-Cyclodextrin that wrapped MWCNTs has unique cavum and NO can be adsorbed inside it, the adsorption amount of NO of MWCNTs modified byβ-Cyclodextrin increased comparison of MWCNTs. The Raman G bands of MWCNTs dopped with N and B happen to red shift, which show the characteristic of semiconductor obviously.Electrocatalytic oxidation of nitric oxide (NO) at the modified electrodes of MWCNTs dopped with N and B were studied with cyclic voltammetric determination.The activity of modified electrode of MWCNTs dopped with N and B were better than that of MWCNTs, MWCNTs activated by KOH and modified byβ-Cyclodextrin. The activation energy (anode potential of MWCNTs dopped with N and B) of NO oxidation decreased. The result demonstrates that sensitivity of NO electrocatalytic oxidation reaction of MWCNTs dopped with N and B was enhanced.