On the adsorption mechanism of copper ions on bentonite clay

Abstract

The adsorption of copper ions on bentonite clay was studied as a function of the pH of the medium, contact time, and temperature. A comparative study of the applicability of the Langmuir and Freindlich adsorption models for the description of the experimental adsorption isotherms of Cu 2+ was carried out. The constants and parameters of the equations describing the adsorption equilibrium were determined. The correlation coeffi cients (R 2 ) indicate that both models satisfactorily outline the sorption process. However, the Langmuir adsorption isotherm is more preferable for describing adsorption of Cu 2+ ions on bentonite clay, since it allows one to determine the limiting adsorption capacity. The adsorption of Cu 2+ ions on bentonite clay increases as the temperature increases from 293 to 333 K. At the same time, the shape of the adsorption isotherms remains unchanged.

Valorization of Cherry By-Products as Coagulant/Flocculants Combined with Bentonite Clay for Olive Mill Wastewater Treatment

“…Thus, the search for efficient, abundant, and inexpensive adsorbent materials has increased. Clay minerals are an example of materials that have been demonstrating high potential as an adsorbent [27] due to their abundance in nature, low cost, small particle sizes (<2 µm), high surface area, which results in complex porous structure, and suitable swelling properties [27,28]. Bentonite clays are a mixture of clay minerals, predominantly montmorillonite (>60 wt.%) [29].…”