Study of kinetics in the biosorption of lead onto native and chemically treated olive stone |
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| Affiliation: | 1. Physical Chemistry Department, Laboratory of Surface Chemistry and Catalysis, National Research Center, Dokki, Cairo, Egypt;2. Zoology Department, College of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia;3. Electron Microscope and Thin Films Department, National Research Center (NRC), El- Behooth Street, Giza 12622, Egypt;1. Department of Inorganic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, P.O. Box 87317-51167, Iran;2. Institute of Nano Science and Nano Technology, University of Kashan, Kashan, P.O. Box 87317-51167, Iran;1. Department of Environment, Hamedan Branch, Islamic Azad University, Hamedan, Iran;2. Young Researchers & Elite Club, Hamedan Branch, Islamic Azad University, Hamedan, Iran;3. Department of Chemistry, Ilam University, Ilam, Iran;1. Department of Chemistry, Faculty of Science, Shahrekord University, Shahrekord, P.O. Box 115, Iran;2. Department of Chemistry, Faculty of Science, University of Jiroft, Jiroft, P. O. Box 7867161167, Iran;3. Department of Chemistry, College of Chemical Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran;4. Department of Chemistry, Payame Noor University, Tehran, Iran;1. Department of Physics, Agni College of Technology, Thalambur, Chennai 603103, India;2. Radiological Safety Division, Indira Gandhi Centre For Atomic Research, Kalpakkam, 603102, India;3. Material Science Laboratory Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India;4. Department of Physics, Pondicherry University, 605014, India;5. Department of Physics, SSN College of Engineering, Kalavakkam, Chennai 603110, India |
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| Abstract: | In this research, olive stone was used as precursor for the development of new biosorbents for lead ions. Chemical treatments were analyzed in terms of their effects on physical–chemical properties and kinetics of lead removal. A kinetic study of the biosorption of lead ions by olive stone was analyzed according to six different kinetic models (pseudo first, pseudo second, pseudo n-order, Elovich, solid diffusion and double exponential models). The biosorption kinetic data were successfully described with pseudo-nth order and double exponential models for all biosorbents. The double exponential model allowed estimating the values of external and internal mass transfer coefficients. The values of external mass transfer coefficient (ke) ranged from 42.62 × 10−6 to 508.3 × 10−6 m min−1 and the internal mass transfer coefficient (ki) from 3.76 × 10−6 to 73.4 × 10−6 m min−1. On the other hand, the analysis of experimental data showed that chemical treatments of the biomass led to increase biosorption capacity of the native biomass. |
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| Keywords: | Biosorption Double exponential model Kinetics Lead Olive stone |
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