Statistical optimization, interaction analysis and desorption studies for the azo dyes adsorption onto chitosan films

- The adsorption of azo dyes onto chitosan films (CF) was studied.
- The tartrazine and amaranth adsorption capacities were 413.8 and 278.3 mg g−1.
- Interactions between the CF amino groups and anionic dyes occurred.
- CF were easily separated from the liquid phase after the adsorption.
- CF can be used for two cycles, maintaining the same adsorption capacity.