The adsorption capacity of adsorbent is closely related to
the functional groups adsorbed on the surface of adsorbent
[16−18]. In order to study the functional groups adsorbed on
the surface of activated carbons, all the samples were characterized
by FT-IR technology and the results are displayed in
Figure 3. It can be seen that all the FT-IR curves were almost
the same. There was no adsorption peak in the curves.
It seems that there was no organic group adsorbed on the activated
carbons, which may be caused by the activated condition
applied in this paper.