Figure 2

FT-IR spectra of (a) Graphene oxide, (b) Cellulose nanocrystals, (c) Cellulose nanocrystals/graphene oxide film, (d) Cellulose nanocrystals/graphene film after Fe(II) adsorption, (e) Cellulose nanocrystals/graphene film after Fe(III) adsorption, (f) Cellulose nanocrystals/graphene film after binary adsorption of Fe(II) and Fe(III).