Removal of Cd2+, Cu2+, Ni2+, and Pb2+ ions from aqueous solutions using tururi fibers as an adsorbent |
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| Authors: | Diego Q. Melo Carla B. Vidal André Leandro da Silva Raimundo N. P. Teixeira Giselle Santiago Cabral Raulino Thiago C. Medeiros Pierre B. A. Fechine Selma Elaine Mazzeto Denis De Keukeleire Ronaldo F. Nascimento |
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| Affiliation: | 1. Department of Analytical Chemistry and Physical Chemistry, Federal University of Ceará, Fortaleza, Ceará, Brazil;2. Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil;3. Department of Organic and Inorganic Chemistry, Federal University of Ceará, Fortaleza, Ceará, Brazil;4. Faculty of Pharmaceutical Sciences, Laboratory of Pharmacognosy and Phytochemistry, University of Gent, Gent, Belgium |
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| Abstract: | This work investigates the removal of Cd2+, Cu2+, Ni2+, and Pb2+ ions from aqueous solutions using tururi fibers as an adsorbent under both batchwise and fixed‐bed conditions. It was found that modification of the tururi fibers with sodium hydroxide increased the adsorption efficiencies of all metal ions studied. The fractional factorial design showed that pH, adsorbent mass, agitation rate, and initial metal concentration influenced each metal adsorption differently. The kinetics showed that multi‐element adsorption equilibria were reached after 15 min following pseudo‐second‐order kinetics. The Langmuir, Freundlich, and Redlich–Peterson models were used to evaluate the adsorption capacities by tururi fibers. The Langmuir model was found to be suitable for all metal ions. Breakthrough curves revealed that saturation of the bed was reached in 160.0 mL with Cd2+ and Cu2+, and 52.0 mL with Ni2+ and Pb2+. The Thomas model was applied to the experimental data of breakthrough curves and represented the data well. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40883. |
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| Keywords: | adsorption applications cellulose and other wood products separation techniques |
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