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Influence of the Structure of the Aminoalkyl Group in Polysiloxane on the Selectivity of Its Interaction with Metal Ions
Russian Journal of Applied Chemistry ( IF 0.9 ) Pub Date : 2021-06-17 , DOI: 10.1134/s1070427221040078
A. S. Kholmogorova , E. A. Fedoseeva , L. K. Neudachina , V. A. Osipova , A. V. Pestov

Abstract

Polysiloxanes containing nonchelating 3-aminopropyl and chelating N-(2-aminoethyl)-3-aminopropyl groups with the degree of functionalization of 28 and 24%, respectively, were prepared by sol–gel synthesis. The polysiloxanes obtained showed comparable activity in sorption of Pd(II), Pt(IV), Fe(III), Cd(II), Zn(II), Co(II), Ni(II), Cu(II), Mn(II), Pb(II), Ca(II), and Mg(II) ions from model multicomponent solutions. At pH < 3,3-aminopropylpolysiloxane selectively takes up platinoid ions. The chelating structure of N-(2-aminoethyl)-3-aminopropyl groups leads to a decrease in the selectivity of the interaction with Pd(II) ions but increases the affinity for Fe(III), Ni(II), and Cu(II). Preconcentration in the dynamic mode allows quantitative sorption of Pd(II) and Pt(IV), followed by virtually quantitative elution of the metal ions from the sorbent surface.



中文翻译:

聚硅氧烷中氨基烷基的结构对其与金属离子相互作用选择性的影响

摘要

含有非螯合 3-氨基丙基和螯合N- (2-氨基乙基)-3-氨基丙基的聚硅氧烷,官能化度分别为 28% 和 24%,通过溶胶-凝胶合成制备。所得聚硅氧烷在吸附 Pd(II)、Pt(IV)、Fe(III)、Cd(II)、Zn(II)、Co(II)、Ni(II)、Cu(II)、Mn 方面表现出相当的活性(II)、Pb(II)、Ca(II) 和 Mg(II) 离子来自模型多组分溶液。在 pH < 3,3-氨基丙基聚硅氧烷选择性地吸收铂类离子。N的螯合结构-(2-氨基乙基)-3-氨基丙基会导致与 Pd(II) 离子相互作用的选择性降低,但会增加对 Fe(III)、Ni(II) 和 Cu(II) 的亲和力。动态模式下的预浓缩可以定量吸附 Pd(II) 和 Pt(IV),然后从吸附剂表面几乎定量地洗脱金属离子。

更新日期:2021-06-18
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