The formation of chitosan derivatives was evinced by FT-IR, 1H and 13C NMR, UV-vis and EDX spectroscopy. 
FT-IR
The formation of chitosan derivatives was evinced by FT-IR, 1H and 13C NMR, UV-vis and EDX spectroscopy. 
13C NMR
The formation of chitosan derivatives was evinced by FT-IR, 1H and 13C NMR, UV-vis and EDX spectroscopy. 
UV-vis
The formation of chitosan derivatives was evinced by FT-IR, 1H and 13C NMR, UV-vis and EDX spectroscopy. 
EDX
The morphology of samples was detected by FE-SEM, TEM and AFM images. 
FE-SEM
The morphology of samples was detected by FE-SEM, TEM and AFM images. 
TEM
The morphology of samples was detected by FE-SEM, TEM and AFM images. 
AFM