The infrared spectra of the adsorbent in KBr pellets were recorded on the FTIR Spectrometer FSM 1202
The KBr pellets were prepared under 200 bar pressure for 8 min.
The spectrawere recorded by accumulation of at least 32 scans, the resolution being 4 cm1.
Bands were identified according to Kumirska et al. (2010).