Studies on transport mechanism of Cr(VI) extraction from an acidic solution using liquid surfactant membranes |
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| Institution: | 1. Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon 305-350, Republic of Korea;2. Advanced Materials & Processing Center, Institute for Advanced Engineering (IAE), Yangon-si, Gyeonggi-do 449-863, Republic of Korea;3. Resources Recycling, Korea University of Science and Technology, Daejeon 305-350, Republic of Korea;4. CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India;1. Department of Chemical Engineering, Laxminarayan Institute of Technology, Rashtrasant Tukadoji Maharaj Nagpur University, Nagpur 440033, Maharashtra, India;2. Department of Chemical Engineering, National Institute of Technology, Warangal 506004, Telangana, India;1. Department of Chemistry, North Tehran Branch, Islamic Azad University, Tehran, Iran;2. Biotechnology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran;3. School of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran;4. Department of Chemistry, Ahar Branch, Islamic Azad University, Ahar, Iran |
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| Abstract: | A mathematical model for analysing the extraction of Cr(VI) from aqueous acidic solution by emulsion liquid membrane using Aliquat 336 as extractant and NaOH as stripping agent has been presented. The existing models developed so far do not account for the existence of different forms of Cr(VI) ions in the aqueous phase depending on pH conditions. Accordingly, in the present model, reaction equilibrium has been considered instead of distribution coefficient to represent realistically the transport mechanism for this type of system through liquid surfactant membrane. Unlike other models, liquid–liquid equilibrium of sodium hydroxide-chloride of Aliquat 336 has also been considered. The carrier thus exists in the membrane phase in hydroxide and chloride forms and extraction of hexavalent chromium from the external phase proceeds by the two carriers. The validity of the model has been checked from comparison of the simulated curves and experimental data using chemical reaction equilibrium constant and Deff/R2 as fitting parameters. |
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