Removal of 2.4-dichloro phenoxyacetic acid from aqueous solution by adsorption on activated carbon. A kinetic study |
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| Affiliation: | 1. Chemical Injuries Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran;2. Faculty of Pharmacy, Baqiyatallah University of Medical Sciences, Tehran, Iran;3. Razi Drug Research Center, Iran University of Medical Sciences, Tehran, Iran;4. Department of Medicinal Chemistry, School of Pharmacy-International Campus, Iran University of Medical Sciences, Tehran, Iran;5. Center of Excellence in Electrochemistry, University of Tehran, Tehran, Iran;6. Social Determinants of Health (SDH) Research Center, Kashan University of Medical Sciences, Kashan, Iran;7. Core Research Lab, Kashan University of Medical Sciences, Kashan, Iran;8. IESEM, TU Bergakademie, Germany;9. Biosensor Research Centre, Endocrinology & Metabolism Molecular and Cellular Research Institute, Tehran University of Medical Sciences, Tehran, Iran;1. CIRIMAT, Université de Toulouse, CNRS/INP/UT3, Ensiacet, 4 allée E. Monso, 31030 Toulouse cedex 4, France;2. CIRIMAT, Université de Toulouse, Faculté des Sciences Pharmaceutiques, 35 Chemin des Maraîchers, 31400 Toulouse, France;3. SEPPIC – Air Liquide Healthcare, 127 Chemin de la Poudrerie, 81105 Castres, France;4. Department of Chemistry and Pharmacy, University of Sassari, Via Muroni 23/a, 07100 Sassari, Italy;1. Electrochemical Research Laboratory, Department of Chemistry, SVU College of Sciences, Sri Venkateswara University, Tirupati 517 502, Andhra Pradesh, India;2. Department of Psychiatry, Sri Devaraj Ur''s Acedamy of Higher Education and Research (SDUAHER), Tamaka, Kolar, Karnataka, India;3. Department of Environmental Sciences, SVU College of Sciences, Sri Venkateswara University, Tirupati 517 502, Andhra Pradesh, India |
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| Abstract: | The sorption of 2.4-dichloro phenoxyacetic acid (2.4-D) on two different activated carbons was determined using the batch equilibration technique. The calculated slopes of the Freundlich sorption isotherms were significantly less than 1. The (K) values were higher for the activated carbon which has the higher specific surface, and increased with NaCl concentration. The rate of attaining equilibrium of 2.4-D increased with a decrease in absorbent concentration. Dynamic modelling of the adsorption showed that a first order reversible kinetic model was followed for the adsorption process. The overall rate constant K′, the adsorption rate K1, the desorption rate constant K2, and the equilibrium constant Kc for the adsorption process were calculated. |
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