Chromium adsorption in olive stone activated carbon
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In this work, Cr(III) adsorption on activated carbon obtained from olive stones in an upflow fixed-bed column at 30∘C was studied. The flow rate influence on the breakthrough curves at a feed concentration of 0.87 meq/L was investigated in an attempt to minimize the diffusional resistances. Breakthrough curves for a flow range of 2–8 mL/min were obtained at 10.5 cm bed height and inlet diameter of 0.9 cm. The mass transfer parameters indicated that the bed minimal resistance was attained at 2 mL/min. Therefore, the data equilibrium was carried out until the bed was saturated at 2 mL/min. The dynamic system generated a favorable isotherm with a maximum chromium uptake of 0.45 meq/g. A column sorption mathematical model was created considering the axial dispersion in the column and the intraparticle diffusion rate-controlling steps. The isotherm was successfully modeled by the Langmuir equation and the mathematical model described the experimental dynamic data adequately for feed concentrations from 0.26 to 3.29 meq/L.
KeywordsChromium Activated carbon Olive stones Adsorption Breakthrough
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- Arriagada, R., G. Bello, R. Cid, and R. García, “Retención de Cromo en Carbones Activados,” in Barros, M.A.S.D. et al. (Eds). Problemas Ambientales con Soluciones Catalíticas I. El Cromo en el Curtido de Pieles, CYTED, Madrid-Spain (2001).Google Scholar
- Barros, M.A.S.D., “Evaluation of the Chromium Exchange Mechanism in Zeolitic Systems,” Portuguese, Doctorate Thesis, Universidade Estadual de MaringÁ, MaringÁ, Brazil (2003).Google Scholar
- Geankoplis, C.J., Transport Processes and Unit Operations, 3th ed. PTR Prentice Hall. USA (1993).Google Scholar
- Hill, C.G., An Introduction to Chemical Engineering Kinetics and Reactor Design, John Wiley & Sons, USA (1977).Google Scholar
- Lyubchik, S.I., A.I. Lyubchik, O.L. Galushko, L.P. Tikhonova, J. Vital, I.M. Fonseca, and S.B. Lyubchik, “Kinetics and Thermodynamics of the Cr(III) Adsorption on the Aactivated Carbon from Co-mingled Wastes,” Colloids and Surfaces A: Physicochem. Eng. Aspects, 242, 151–158 (2004).CrossRefGoogle Scholar
- Nelder, J.A. and R. Mead, “A Simplex Method for Function Minimization,” The Computer Journal, 7, 308–315 (1965).Google Scholar
- Silva, E.A., C.R.G. Tavares, L. Cardozo Filho, T.M.K. Ravagnani, and E.S. Cossich, “Biossorption of Chromium (III) by Biomass of Seaweed Sargassum Sp. in Fixed-Bed Column,” Adsorption, 10(4324), 129–138 (2004).Google Scholar
- Silva, E.A., “Study of the Removal of Metal Ions Chromium (III) and Copper(II) in Fixed-bed Column using as Biosorbent the Seaweed Algae Sargassum sp.,” Portuguese, Doctorate Thesis, FEQ/Unicamp, Campinas-Brazil (2001).Google Scholar