Chitosan/iron oxide nanocomposite films: Effect of the composition and preparation methods on the adsorption of congo red

KLOSTER, GIANINA A.; MOSIEWICKI, MIRNA A.; MARCOVICH, NORMA E.

CARBOHYDRATE POLYMERS

ELSEVIER SCI LTD

Año: 2019 vol. 221 p. 186 - 194

0144-8617

Composite films based on chitosan, glycerol and magnetic iron oxides were obtained by two different procedures:in situ generation of iron oxide particles in the already formed films and dispersion of previously synthesizediron oxide particles into the film forming solution by sonication, and then tested as adsorbents for theremoval of congo red (CR) from solutions of different concentrations. Their performances were compared withthose of the corresponding films without particles. All the samples presented similar behavior when contactedwith solutions containing up to 70 mg/L CR (maximum sorption capacity ?25 mg/g), but sonicated samples exhibitedan increased dye adsorption when in contact with more concentrated solutions, reaching up to 700 mg/gsorption capacity. These differences were explained considering the obtaining procedure of the films, theircomposition and microstructure, as well as the changes in the pH of the dye solution once the adsorbent film wasput inside.