Radzyminska-Lenarcik Elzbieta, Ulewicz Malgorzata
Faculty of Chemical Technology and Engineering, UTP University of Science and Technology, Seminaryjna 3, PL 85-326 Bydgoszcz, Poland.
Czestochowa University of Technology, Dabrowskiego 69 Street, PL 42-201 Czestochowa, Poland.
Polymers (Basel). 2019 Oct 30;11(11):1780. doi: 10.3390/polym11111780.
The study involved the transport of zinc(II), cadmium(II), and nickel(II) ions from acidic aqueous solutions using polymer inclusion membranes (PIMs). PIMs consisted of cellulose triacetate (CTA) as a support; o-nitrophenyl pentyl ether (o-NPPE) as a plasticizer; and 1-octylimidazole (), 1-octyl-2-methylimidazole (), 1-octyl-4-methylimidazole (), or 1-octyl-2,4-dimethylimidazole () as ion carriers. The membranes were characterized by means of atomic force microscopy (AFM) and scanning electron microscopy (SEM). The results show that Zn(II) and Cd(II) are effectively transported across PIMs, while Ni(II) transport is not effective. The rate of transport of metal ions across PIMs is determined by the diffusion rate of the M(II)-carrier complex across the membrane. The best result achieved for Zn(II) removal after 24 h was 95.5% for the ternary Zn(II)-Cd(II)-Ni(II) solution for PIM doped (). For this membrane, the separation coefficients for Zn(II)/Cd(II), Zn(II)/Ni(II), and Cd(II)/Ni(II) were 2.8, 104.5, and 23.5, respectively. Additionally, the influence of basicity and structure of carrier molecules on transport kinetics was discussed.
该研究涉及使用聚合物包容膜（PIMs）从酸性水溶液中传输锌（II）、镉（II）和镍（II）离子。PIMs由三醋酸纤维素（CTA）作为支撑体；邻硝基苯基戊基醚（o-NPPE）作为增塑剂；以及1-辛基咪唑（ ）、1-辛基-2-甲基咪唑（ ）、1-辛基-4-甲基咪唑（ ）或1-辛基-2,4-二甲基咪唑（ ）作为离子载体。通过原子力显微镜（AFM）和扫描电子显微镜（SEM）对膜进行了表征。结果表明，锌（II）和镉（II）能有效地透过PIMs传输，而镍（II）的传输效果不佳。金属离子透过PIMs的传输速率由M（II）-载体配合物在膜中的扩散速率决定。对于掺杂（ ）的PIM，在24小时后从三元锌（II）-镉（II）-镍（II）溶液中去除锌（II）的最佳结果为95.5%。对于该膜，锌（II）/镉（II）、锌（II）/镍（II）和镉（II）/镍（II）的分离系数分别为2.8、104.5和23.5。此外，还讨论了载体分子的碱性和结构对传输动力学的影响。
