commercial coffee wastes as materials for adsorption of heavy metals from aqueous solutions商业咖啡废物材料吸附重金属的水解决方案.pdfVIP

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commercial coffee wastes as materials for adsorption of heavy metals from aqueous solutions商业咖啡废物材料吸附重金属的水解决方案.pdf

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commercial coffee wastes as materials for adsorption of heavy metals from aqueous solutions商业咖啡废物材料吸附重金属的水解决方案

Materials 2012, 5, 1826-1840; doi:10.3390/ma5101826 OPEN ACCESS materials ISSN 1996-1944 /journal/materials Article Commercial Coffee Wastes as Materials for Adsorption of Heavy Metals from Aqueous Solutions George Z. Kyzas Department of Petroleum and Natural Gas Technology, Technological Educational Institute of Kavala, Kavala GR-654 04, Greece; E-Mail: georgekyzas@; Tel./Fax: +30-2310-858607. Received: 7 August 2012; in revised form: 18 September 2012 / Accepted: 26 September 2012 / Published: 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.