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首页> 外文期刊>Journal of Applied Polymer Science >Acrylic weak-base anion exchangers and their behaviors in the retention process of some heavy-metal cations
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Acrylic weak-base anion exchangers and their behaviors in the retention process of some heavy-metal cations

机译：丙烯酸弱碱阴离子交换剂及其在某些重金属阳离子保留过程中的行为

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Two macroporous acrylonitrile/10% vinyl acetate/10% divinylbenzene copolymers as beads were obtained by the aqueous suspension copolymerization of the three comonomers in the presence of toluene as a diluent, which was used in two different amounts. These copolymers were chemically modified by their reactions with ethylenediamine, diethylenetriamine, and triethylenetetramine in the presence of water when the aminolysis-hydrolysis reaction of the nitrile groups and the hydrolysis reaction of the acetate groups occurred. From these reactions, weak-base anion exchangers with high ion-exchange capacities, between 1.6 and 2.2 mequiv/mL and 6.5 and 10.5 mequiv/g, were obtained. For these anion exchangers, the behaviors in the retention processes of the Ni(II), Cd(II), and Pb(II) cations were evaluated with the bath method. All the resins exhibited retention properties, but the retained amounts of the metal cations differed as a function of the resin and cation nature. Thus, the resin from the reaction with triethylenetetramine of the copolymer obtained in the presence of a larger amount of toluene could be considered the most suitable sorbent for the three metal cations, especially for Ni(II). Its maximum retention capacity for this cation was 2.67 mequiv/g of dried resin. From the noncompetitive and competitive retentions was observed the following selectivity order: Ni(II) > Cd(II) > Pb(II). The retention took place by the chelating processes between the functional groups with the ligand role, especially free amine groups, and metal cations. (c) 2005 Wiley Periodicals, Inc.
机译：通过在甲苯作为稀释剂存在下将三种共聚单体以两种不同量使用而进行的水性悬浮共聚，获得了两种大孔的丙烯腈/ 10％乙酸乙烯酯/ 10％二乙烯基苯共聚物作为珠粒。当发生腈基团的氨解-水解反应和乙酸酯基团的水解反应时，这些共聚物在水的存在下通过与乙二胺，二亚乙基三胺和三亚乙基四胺的反应进行化学改性。从这些反应中，获得具有高离子交换能力的弱碱阴离子交换剂，其介于1.6和2.2mequiv / mL之间以及6.5和10.5mequiv / g之间。对于这些阴离子交换剂，使用浴法评估了Ni（II），Cd（II）和Pb（II）阳离子在保留过程中的行为。所有树脂均显示出保留性能，但是金属阳离子的保留量随树脂和阳离子性质的不同而不同。因此，可以认为来自在大量甲苯存在下获得的共聚物与三亚乙基四胺反应的树脂被认为是最适合三种金属阳离子，特别是镍（II）的吸附剂。其对该阳离子的最大保留容量为2.67 mequiv / g干燥树脂。从非竞争性和竞争性保留中观察到以下选择性顺序：Ni（II）> Cd（II）> Pb（II）。保留是通过具有配体作用的官能团，特别是游离胺基，与金属阳离子之间的螯合过程进行的。 （c）2005年Wiley Periodicals，Inc.

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