Chemical functionalities of carbon in activated carbon; A study by proton NMR, high resolution solid state NMR of (sup 13)C and FTIR.

摘要

Static solid state proton NMR and Magic Angle Spin (MAS) high resolution (sup 13)C NMR were performed on original and oxidized activated carbon. The (sup 13)C NMR spectra indicate that there is a relatively narrow dispersion of chemical shifts centered at an isotropic value of 119.5 ppm. The asymmetric shielding components indicate that the majority of the carbon atoms in activated carbon are sp(sup 2) hybridized. The (sup 1)H NMR spectra show that: (a) the mole ratio of H/C in evacuated, '' as received'' samples is 1:29, (b) most of the protons chemically bound to the carbon are aromatic with the fraction of aliphatic proton being 4.57%. Approximately 0.2 mmole/g of water is chemisorbed on original evacuated sample. 38 refs., 17 figs.