3.5. FTIR analysis results
The origin and nature of the biosorbents such as its physical structure, chemical nature and functional
groups may control the biosorption performance [23]. The FTIR spectra of banana peel before and after
chemical treatment in the range of 4000 500cm 1 were taken to identify the functional groups in thebiosorption. The FT-IR spectra of NBP and ABP are shown in Fig. 9. In both spectra, the broad and
intense absorption peaks in the range 3200-3500 cm 1 reflected O-H stretching vibrations of hydroxyl
group on the surface of banana peel on the both cases, correspond to the O H stretching vibrations of
cellulose, pectin, absorbed water, hemicelluloses, and lignin.