Ligand-accelerated liquid membrane extraction of metal ions |
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| Affiliation: | 1. Peter A. Rock Thermochemistry Laboratory and NEAT ORU University of California Davis, One Shields Avenue, 4415 Chemistry Annex, 95616 Davis, CA, USA;2. Department of Solid State Physics, Faculty of Applied Physics and Mathematics, Gdansk University of Technology, ul. Narutowicza 11/12 80-233 Gdansk, Poland;1. School of Pharmaceutical Sciences, Aichi Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya 464-8650, Japan;2. School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan;3. Faculty of Pharmaceutical Sciences, Hokuriku University, Ho-3 Kanagawa-machi, Kanazawa 920-1181, Japan;1. Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan;2. Department of Chemistry, University of Gujrat, Hafiz Hayat Campus, Gujrat 50700, Pakistan;3. Computational Biology Lab, National Center for Bioinformatics, Quaid-i-Azam University, Islamabad 45320, Pakistan;4. Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia;5. Center of Excellence for Advanced Materials Research (CEAMR), Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia;6. Department of Chemistry, Kohat University of Science and Technology, Kohat 26000, Pakistan;1. Department of Medical Parasitology, Faculty of Medicine, Alexandria University, Alexandria, Egypt;2. Department of Zoonotic Diseases, National Research Centre, Cairo, Egypt;3. Department of Pathology, Faculty of Medicine, Alexandria University, Alexandria, Egypt |
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| Abstract: | A method has been developed to enhance the liquid membrane extraction of heavy metals such as cobalt, copper and nickel. The method consists of introducing anion ligands, such as acetate, to the aqueous solution containing metal ions. In the absence of a ligand in the aqueous phase, it takes about 15 min for a 80% cobalt recovery, while only 2 min are needed for a 95% recovery with the addition of 0.1 M acetate in the feed solution. The ligand effects on liquid membrane extraction are rationalized in terms of the labile nature of the ligand—metal complexes, the distribution coefficients of the metal ions, the interfacial and surface tensions, and by the nuclear magnetic r̀esonance (NMR) spectra of the metal—organic complexes. |
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