Abstract
This paper evaluated the adsorption capacity of zinc by Bofe bentonite clay. Bofe clay was subjected to a thermal treatment for optimizing its adsorption capacity. The kinetic equilibrium of the process was studied in a finite bath system and experiments were performed by varying pH, the amount of adsorbent and initial concentration of the metal. The Langmuir and Freundlich models were used for the analysis of adsorption equilibrium. The physicochemical characterization of clay, before and after the adsorption process, included the techniques of scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction and N 2 physisorption. The calcined Bofe clay is able to remove zinc from synthetic wastewater. Langmuir model provided the best fit for sorption isotherms with a maximum amount of metal adsorbed of 4.95 mg of metal g -1 of calcined clay. The adsorption was strongly influenced by the initial conditions and modifies the physicochemical characteristics of the clay.
Highlights
Numerous industrial activities have contributed to a significant increase in concentrations of metal ions in water resources due to the release of effluents
The adsorption is reported as an alternative to tertiary treatment for removal of heavy metals in the opportunity to satisfactorily meet effluent with low concentrations of metals, in addition to using low cost adsorbents
This paper evaluated the adsorption capacity of zinc on calcined Bofe clay in finite bath and the influence of parameters, such as adsorbent amount, pH and initial concentration of metal
Summary
Numerous industrial activities have contributed to a significant increase in concentrations of metal ions in water resources due to the release of effluents. The adsorption is reported as an alternative to tertiary treatment for removal of heavy metals in the opportunity to satisfactorily meet effluent with low concentrations of metals, in addition to using low cost adsorbents. The use of clay as an adsorbent for removing heavy metals is due to its ion exchange capacity (CEC), selectivity, regenerability and abundance compared to other natural and synthetic adsorbents. Studies such as those conducted by Jiang et al (2010), Ghorbel-Abid et al (2010), Vieira et al. The calcined Bofe clay (before and after zinc adsorption) was characterized by energy-dispersive X-ray spectroscopy, X-ray diffraction and N2 physisorption
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