Equilibrium modeling of removal of cadmium ions by olive stones

• Published in: Environmental progress 2006-10, Vol.25 (3), p.261-266
• Main Authors: Calero de Hoces, Mónica, Hernáinz Bermúdez de Castro, Francisco, Blázquez García, Gabriel, Tenorio Rivas, Germán
• Format: Article
• Language: English
• Subjects: affinity; Applied sciences; Biological and medical sciences; Biotechnology; Cadmium; equilibrium; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; Ions; Methods. Procedures. Technologies; Olea; olive stones; Others; Pollution; Q1; Q2; Sorbents; sorption; Temperature; Various methods and equipments
• ISSN: 0278-4491; 1547-5921
• DOI: 10.1002/ep.10151

This article addresses the equilibrium for cadmium biosorption using olive stones as a sorbent material over a range of temperatures between 25 and 80° C. Three models frequently used in the literature—Langmuir, Freundlich, and Redlich–Peterson—were examined to describe these equilibrium data. The experimental results fit Langmuir's model for the majority of temperatures tested. The maximal biosorption capacity, qm, increases with temperature, rising from 4.52 mg/g at 25° C to 9.72 mg/g at 80° C. Also, the affinity of olive stones for cadmium, represented by parameter b in Langmuir's model, increases when the temperature is raised from 25 to 80° C. Finally, the shape of Langmuir's model, represented by the dimensionless parameter KR, shows that cadmium biosorption with olive stones works well at the temperatures and initial cadmium concentrations tested in this study. © 2006 American Institute of Chemical Engineers Environ Prog, 2006