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首页> 外文期刊>Journal of Applied Polymer Science >Water-soluble amine and imine polymers with the ability to bind metal ions in conjunction with membrane filtration
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Water-soluble amine and imine polymers with the ability to bind metal ions in conjunction with membrane filtration

机译：水溶性胺和亚胺聚合物，具有结合金属离子的能力和膜过滤功能

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摘要

commercial polymers poly(ethylene imine) (PEI), poly(ethylene imine epichlorohydrin), and poly (dimethylamine-co-epichlorohydrin) were purified and fractionated by ultrafiltration. Their metal-ion-binding properties with respect to different ligand groups and the effect of the concentration on the retention properties were investigated. The amine ligands of the Polymers formed the most stable complexes with the metal ions. In general, there was an effect of the pH and polymer fraction size on the retention properties. As the pH and polymer fraction size increased, the affinity to bind metal ions also increased. PEI had the highest metal-retention values, particularly at higher pHs, at which the amine groups were nonprotonated and could coordinate easily with the metal ions. Only Pb(II) was poorly retained. The affinity for all the metal ions, except Pb(II), increased significantly at pH 5. The metal-ion retention decreased quickly as the filtration factor increased, except for Cu(II), Co(II), Ni(II), Cd(II), and Zn(II) ions, which were retained by over 40%, at a filtration factor of 4. For other metal ions such as Pb(II), Ca(II), and Mg(II), only 10% remained bound to the polymer. (C) 2005 Wiley Periodicals, Inc.
机译：商购的聚合物聚（亚乙基亚胺）（PEI），聚（亚乙基亚胺表氯醇）和聚（二甲胺-共-表氯醇）经超滤纯化和分馏。研究了它们相对于不同配体基团的金属离子结合特性以及浓度对保留特性的影响。聚合物的胺配体与金属离子形成最稳定的配合物。通常，pH和聚合物级分的大小都会影响保留性能。随着pH和聚合物级分大小的增加，结合金属离子的亲和力也增加。 PEI具有最高的金属保留值，尤其是在较高的pH值下，在该pH下，胺基未质子化并且可以轻松地与金属离子配位。仅Pb（II）保留不佳。在pH 5时，除Pb（II）以外，对所有金属离子的亲和力均显着提高。随着Cu（II），Co（II），Ni（II），过滤系数为4的Cd（II）和Zn（II）离子保留率超过40％。对于其他金属离子，例如Pb（II），Ca（II）和Mg（II），仅10％保持与聚合物结合。 （C）2005 Wiley期刊公司

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