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Materials 2012, 5(10), 1826-1840; doi:10.3390/ma5101826
Article

Commercial Coffee Wastes as Materials for Adsorption of Heavy Metals from Aqueous Solutions

Received: 7 August 2012 / Revised: 18 September 2012 / Accepted: 26 September 2012 / Published: 10 October 2012
Download PDF [624 KB, 11 October 2012; original version 10 October 2012]

Abstract

This work aims to study the removal of Cu(II) and Cr(VI) from aqueous solutions with commercial coffee wastes. Materials with no further treatment such as coffee residues from café may act as adsorbents for the removal of Cu(II) and Cr(VI). Equilibrium data were successfully fitted to the Langmuir, Freundlich and Langmuir-Freundlich model (L-F). The maximum adsorption capacity of the coffee residues can reach 70 mg/g for the removal of Cu(II) and 45 mg/g for Cr(VI). The kinetic data were fitted to pseudo-first, -second and -third order equations. The equilibrium was achieved in 120 min. Also, the effect of pH on adsorption and desorption was studied, as well as the influence of agitation rate. Ten cycles of adsorption-desorption were carried out revealing the strong reuse potential of these low-cost adsorbents; the latter was confirmed from a brief economic approach.
Keywords: coffee wastes; heavy metals; Cu(II); Cr(VI); adsorption; low-cost materials coffee wastes; heavy metals; Cu(II); Cr(VI); adsorption; low-cost materials
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Kyzas, G.Z. Commercial Coffee Wastes as Materials for Adsorption of Heavy Metals from Aqueous Solutions. Materials 2012, 5, 1826-1840.

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