Discriminating the carboxylic groups from the total acidic sites in oxidized multi-wall carbon nanotubes by means of acid-base titration
A. B. González-Guerrero, E. Mendoza, E. Pellicer, F. Alsina, C. Fernández-Sánchez and L.M. Lechuga
Chem. Phys. Lett. , 462(4-6), 2008, 256-259 - DOI: 10.1016/j.cplett.2008.07.071
Abstract: This work reports on the quantitative determination of the carboxylicgroups created upon HNO3 treatment at multi-wallcarbonnanotube (MWCNT) surface. To this purpose, MWCNTs have been oxidized by refluxing in acid for different periods of time (from 1 h to 12 h). The main goal of the present study comprises the development of a simple analytical methodology based on Boehm’s titration that enables the rapid estimation of the totalcarboxylicgroups and their discrimination from the totaloxidizedsites created at MWCNT surface as a result of the acid treatment. The trends observed are correlated with Raman spectroscopy analyses.