Comparative adsorption isotherms and modeling of nickel and cobalt citrate complexes onto chelating resins |
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| Authors: | A Deepatana M Valix |
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| Affiliation: | 1. Faculty of Science and Natural Resources, Universiti Malaysia Sabah, 88400 Kota Kinabalu, Sabah, Malaysia;2. Faculty of Industrial Sciences and Technology, University Malaysia Pahang, 26300 Gambang, Kuantan, Malaysia;1. Department of Applied Chemistry, Zhejiang Gongshang University, Hangzhou 310012, China;2. Department of Food Science and Human Nutrition, University of Florida, Bldg 475 Newell Drive, Gainesville, FL 32611, USA;3. Engineering Research Center for Eco-Dyeing & Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou City, Zhejiang Province 310018, China;4. School of Materials and Textile, Zhejiang Sci-Tech University, Hangzhou City, Zhejiang Province 310018, China;1. School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China;2. Guangdong Polytechnic of Environmental Protection Engineering, Foshan, 528216, PR China;3. Faculty of Chemistry and Environmental Science, Guangdong Ocean University, Zhanjiang, 524000, PR China;1. School of Environmental Science & Engineering, Indian Institute of Technology (IIT), Kharagpur 721302, India;2. Metal Extraction and Recycling Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India;3. Department of Chemical Engineering and Process Development, CSIR-National Chemical Laboratory, Pune 411008, India;1. Chemistry Department, Faculty of Science, Benha University, Benha, Egypt;2. Nuclear Research Center, Atomic Energy Authority, P.O. 13759 Inshas, Cairo, Egypt;3. Faculty of Engineering (Shoubra), Benha University, Shoubra, Egypt |
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| Abstract: | The sorption characteristics of nickel and cobalt-organic acid complexes on two commercial chelating resins (Purolite S930 and S950) were compared. Purolite S390 is based on an iminodiacetic funtional group and S950 is an aminophosphonic acid resin. Batch equilibrium adsorption tests of these resins were examined and compared using various metal citrate concentrations (15–2000 mg/L) and solution pH. The solution pH of complex solutions was varied by preparing metal solutions in 0.01, 0.1, 0.5 and 1.0 M of citric acid. Equilibrium adsorption data were fitted to empirical isotherm models; linear, Langmuir, Freundlich and Redlich–Peterson (R–P) equations to establish the mechanism for the uptake of the metal complexes onto the resins. Our study showed that nickel-citrate complex adsorption exhibited both monolayer and multilayer adsorption; the mechanism on both resins varying with acid concentration, whereas cobalt complex adsorption was independent of acid concentration but the mechanism of metal loading was found to be influenced by the nature of the resins. |
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