Adsorption behavior of Sb(III) in single and binary Sb(III)—Fe(II) systems on cationic ion exchange resin: Adsorption equilibrium,kinetic and thermodynamic aspects |
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| Affiliation: | 1. Department of Materials Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;2. Department of Materials Science and Engineering, College of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran;3. Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran;1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China;2. Henan Key Laboratory of Advanced Nonferrous Metal Materials, Henan University of Science and Technology, Luoyang 471003, China;1. Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China;2. Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, United Kingdom;3. Global Centre for Environmental Remediation, University of Newcastle, Callaghan Campus, NSW, 2308, Australia;1. College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China;2. School of Architecture and Art, Central South University, Changsha 410083, China;3. College of Architecture and Civil Engineering, Hunan University of Arts And Science, Changde 41500, China;4. College of Sports and Art, Hunan Agricultural University, Changsha 410128, China;5. School of Architecture and Urban Planning, Nanjing University, Hankou Road, Nanjing 210093, China;6. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;1. Department of Inorganic Chemistry, Faculty of Chemistry, Maria Curie-Sk?odowska University, M. Curie Sk?odowska Sq. 2, 20-031, Lublin, Poland;2. Environmental and Biotechnology Centre, Department Umwelt und Biotechnologisches Zentrum (UBZ), Helmholtz-Centre for Environmental Research-UFZ, Permoserstr. 15, 04318, Leipzig, Germany |
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| Abstract: | The present study dealt with the mechanism of competitive adsorption of Sb(III) and Fe(II) ions from a copper-containing aqueous solution on Purolite S957, a commercially available cationic ion-exchange adsorbent. Experiments were conducted using aqueous copper sulfate solutions containing either single or conjoint ions, using both sedentary and batch adsorption techniques to ascertain the sensitivity of the adsorption process to variation in pH, mass of resin, contact time, and temperature as well as establishing the optimal range of variables for maximum ion removal. The data from single ion adsorption tests were fitted by non-linear regression techniques to Henry, Langmuir, Freundlich, Temkin, and Dubinin—Radushkevich isotherm models. Freundlich isotherm for Sb(III) and Freundlich and Henry models for Fe(II) solutions best express the adsorption equilibrium data; while for binary ion electrolytes, the extended Freundlich model fitted the data satisfactorily. The kinetic model adequately describing adsorption was shown to be the pseudo-first-order, underscoring the dominant role of physical adsorption playing in the process. Thermodynamic parameters for the adsorption process reveal differences in the Sb(III) adsorption mechanism from single ion and Sb(III)—Fe(II) containing electrolytes. The adsorption of Sb(III) alone is endothermic, whereas the process becomes exothermic in the Sb(III)—Fe(II) system. |
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| Keywords: | Sb(III) ion exchange copper refining thermodynamics kinetics Purolite adsorbent |
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