Implementation of a multilayer statistical physics model to interpret the adsorption of food dyes on a chitosan film

This paper reports the application of an advanced multilayer model to study adsorption food dyes FD&C blue No. 2, acid red 18, and yellow 5 from aqueous solutions with a chitosan film. These dyes' mechanisms were discussed analyzed at 298–328 K pH 4–7 via statistical physics calculations. Physicochemical parameters utilized explain dye molecular scale. Modeling results showed aggregation phenomena where each functional group film adsorbed several molecules simultaneously different tested temperatures. Aqueous solution temperature reduced capacities, attributed exothermic nature removal. The was more effective for 5. estimated energies dye-chitosan dye-dye interactions confirmed physisorption associated van der Waals forces hydrogen bonding. study's contributed expanding knowledge on using biopolymers like chitosan.