Cu(II) adsorption from copper mine water by chitosan films and the matrix effects

Abstract

Adsorption of copper ions onto chitosan films was studied, and the matrix effect was evaluated using a synthetic solution and a real effluent from closed copper mine. Chitosan films were prepared by casting technique and characterized. The adsorption study was carried out by equilibrium isotherms, thermodynamics, and kinetics. The thermodynamic parameters indicated that the copper adsorption onto chitosan film was favorable, spontaneous, and exothermic, suggesting an increased randomness at the solid/solution interface. The matrix effect was evaluated in kinetic assays, where a synthetic solution and a real system were carried out at different stirring rates. The highest values of adsorption capacity reached in all stirring rates were about 20% lower in the real effluent, and this reduction in the competitiveness was due to the presence of other ions in the matrix of the real effluent. The maximum adsorption capacity of copper ions onto chitosan films for the synthetic solution was of 450 mg g, and the removal percentage was in the range from 78 to 96%, and these values for the real effluent were of 360 mg g and removal ranging from 62 to 76%. The mapping done of ions present in the water adsorbed of the mine in the films showed that the same was homogeneously distributed in the films' surfaces.

Modelling of Adsorption Kinetic Processes—Errors, Theory and Application

“…Comparing the error functions that determine the suitability of the kinetic model, PSO error parameters possess minimal variations. For example, the adsorption of copper onto chitosan followed PSO mechanism [32].…”

Preparation and characterization of chitosan extracted from shrimp shells waste and chitosan film: application for Eriochrome black T removal from aqueous solutions

“…In addition, CS is a biodegradable, nonallergenic, biocompatible, antibacterial, renewable, nontoxic product and largely used in biomedical and industrial fields as well as in industrial wastewater treatment (Kumar 2000). In the last years, several new forms of chitosan intended for wastewater treatment are produced in the form of films (Rizzi et al 2018;Frantz et al 2017), microcapsules (Tong 2017), composites (Xie et al 2013), nanoparticles (Sivakami et al 2013) and nanofibers (Nthunya et al 2017) to improve its potential applications. Chitosan films could be obtained by various methods (Uragami et al 2002) such as: (1) direct perversion of the chitosan solvent, (2) addition of bifunctional reactants to the chitosan and (3) air-drying of chitosan solutions.…”

Adsorption Behavior and Relative Distribution of Cd2+ Adsorption Mechanisms by the Magnetic and Nonmagnetic Biochars Derived from Chicken Manure

“…CMB, implying the driving force to the adsorption increased with increasing temperature [44]. Meanwhile, the positive values of ∆H 0 highlighted the endothermic nature of adsorption by both biochars, and the positive values of ∆S 0 indicated randomness slightly increased during metal chemisopriotn from solution onto the surface of biochar [8,45].…”