INVESTIGADORES
MARCOVICH norma Esther
artículos
Título:
Adsorption of arsenic onto films based on chitosan and chitosan/nano-iron oxide
Autor/es:
KLOSTER, GIANINA A.; VALIENTE, MANUEL; MARCOVICH, NORMA E.; MOSIEWICKI, MIRNA A.
Revista:
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2020
ISSN:
0141-8130
Resumen:
Films made from neat chitosan and chitosan with magnetic nanoparticles (MNPs) were tested as adsorbents ofarsenate ions. Sorption equilibriumand sorption kinetics studies are reported, including differentmodels appliedto enlighten experimental observations and predict results. The sorption of As (V) was reasonably explainedusing Freundlich isotherm for neat chitosan film although it was better represented by Langmuir equation forthe composite sample. The experimental kinetics results showed that the adsorption of arsenate ions is veryfast during the first minutes and then the composite seems to reach saturation, while a slow desorption in thechitosan film was observed and acceptably fitted with a pseudo first order reversible model. The adsorbent containingMNPs presented higher adsorption capacity, which was associated to the additional adsorbent capacityprovided by the MNPs and its much more irregular surface area that leads to an enhanced adsorption surface.For instance, at 10 mg/L equilibrium concentration, which corresponds to an initial concentration of As(V)much higher than the normal concentration of arsenate in naturalwater, chitosan-MNP sample exhibits a removalcapacity of 10.4 mg/g that is more than six times higher than the 1.6 mg/g shown by the chitosan film.