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Membrane Water Treatment Volume 10, Number 2, March 2019 , pages 127-137 DOI: https://doi.org/10.12989/mwt.2019.10.2.127 |
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A Separation of manganese (II) and cobalt (II) ions by D2EHPA/TBP-immobilized PolyHIPE membrane |
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Jyh-Herng Chen and Le Thi Tuyet Mai
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| Abstract | ||
| The D2EHPA/TBP co-extractants immobilized PolyHIPE membrane can be used for the selective separation of Mn (II) from Co (II). By solvent-nonsolvent method, D2EHPA/TBP co-extractants can be effectively immobilized into PolyHIPE membrane. The pore structure of PolyHIPE membrane and the presence of TBP enhance the stability of immobilized co-extractants. The optimal operating conditions for the separation of Mn (II) and Co (II) are feeding phase at pH 5.5, sulfuric acid concentration in the stripping phase of about 50 g/L and stirring speed at 400 rpm. The D2EHPA/TBP co-extractants ratio of 5:1 shows synergetic effect on Mn/Co separation factor about 22.74. The removal rate and recovery rate of Mn (II) is about 98.4 and 97.1%, respectively, while for Co (II) the transport efficiency is insignificant. The kinetic study of Mn (II) transport shows that high initial flux, Jfo = 80.1 (umol/m2s), and maxima stripping flux, Jsmax = 20.8 (micromol/m2s), can be achieved with D2EHPA/TBP co-extractants immobilized PolyHIPE membrane. The stability and reusability study shows that the membrane can maintain a long term performance with high efficiency. High purity of Co (II) and Mn (II) can be recovered from the feeding phase and stripping phase, respectively. | ||
| Key Words | ||
| Mn (II) and Co (II) separation; D2EHPA; TBP; PolyHIPE membrane; separation factor | ||
| Address | ||
| Jyh-Herng Chen: Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, 1, Section 3, Chung-Hsiao East Road, Taipei, 10608, Taiwan, R.O.C. Le Thi Tuyet Mai: College of Engineering, National Taipei University of Technology, 1, Section 3, Chung-Hsiao East Road, Taipei, 10608, Taiwan, R.O.C. | ||
