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A statistical physics analysis of the adsorption of Fe3+, Al3+ and Cu2+ heavy metals on chitosan films via homogeneous and heterogeneous monolayer models

2021; Elsevier BV; Volume: 343; Linguagem: Inglês

10.1016/j.molliq.2021.117617

1873-3166

Fatma Dhaouadi, Lotfi Sellaoui, Sonia Taamalli, Florent Louis, Abderrahman El Bakali, Tito Roberto Sant’Anna Cadaval, Adrián Bonilla‐Petriciolet, Jorge Luiz Marques, Andrei VallerãoIgansi, Tuanny Santos Frantz, Sabrina F. Lütke, Guilherme Luiz Dotto, Luiz Antônio de Almeida Pinto, Abdelmottaleb Ben Lamine,

Nanomaterials for catalytic reactions

A heterogeneous monolayer model with two types of binding site was utilized to analyze and interpret the adsorption mechanism of Fe3+, Al3+ and Cu2+ ions on chitosan films at 25–55 °C and pH 6. Theoretical results of statistical physics calculations indicated that the adsorption of Fe3+, Al3+ and Cu2+ ions was multi-ionic where two adsorption sites (i.e., amino and hydroxyl groups) were involved but with a different contribution degree. Adsorption capacities at saturation ranged from 125.99 to 512.27 mg/g for tested operating conditions. The removal mechanism of Al3+ and Cu2+ ions was exothermic, whereas the adsorption of Fe3+ ions was endothermic.