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Preparation and characterisation of anion exchangers with dihydroxy-containing alkyl substitutes in the quaternary ammonium functional groups

Citation

Zatirakha, AV and Smolenkov, AD and Pirogov, AV and Nesterenko, PN and Shpigun, OA, Preparation and characterisation of anion exchangers with dihydroxy-containing alkyl substitutes in the quaternary ammonium functional groups, Journal of Chromatography A, 1323 pp. 104-114. ISSN 0021-9673 (2014) [Refereed Article]

Copyright Statement

Copyright 2013 Elsevier B.V.

DOI: doi:10.1016/j.chroma.2013.11.013

Abstract

Novel poly(styrene-divinylbenzene) (PS-DVB) based anion exchangers having one and two (2,3-dihydroxypropyl) substitutes in the quaternary ammonium functional groups are prepared and characterised by ion chromatography (IC). The introduction of bulky and hydrophilic substitutes to the anion-exchange groups allows the elimination of non-ionic interactions between the polarisable anions and the aromatic rings from the matrix and the improvement of separation selectivity as compared with the traditional trimethylammonium (TMA) functionalised ion exchangers. The synthesis of the ion exchangers includes acylation of PS-DVB particles with acetic anhydride followed by reductive amination either with methylamine hydrochloride or dimethylamine and further alkylation with oxiranes under varied conditions. The ion exchange selectivity and separation efficiency of nine adsorbents having different structure of bonded groups, ion exchange capacity (998 μequiv. g−1) or particle size is studied for model mixture of inorganic anions (F, Cl, NO2, Br, NO3, HPO42− and SO42−) using carbonate and hydroxide eluents. The adsorbents with more hydrophilic substitutes provided superior columns efficiencies and better peak symmetry as compared with analogues having hydrophobic functional groups. The calculated values of column efficiencies for polarisable NO3 and HPO42− are 18,500 and 29,000 N/m, respectively, for anion-exchanger, having N-methyl-N′,N″-di-(2,3-dihydroxypropyl)ammonium groups which is significantly higher than 1800 and 12,000 N/m obtained for these anions with anion exchanger bearing TMA functional groups.

Item Details

Item Type:Refereed Article
Keywords:ion chromatography, anion exchangers, hydrophilic functional groups, inorganic anions
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Separation Science
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
Author:Nesterenko, PN (Professor Pavel Nesterenko)
ID Code:94703
Year Published:2014
Deposited By:Chemistry
Deposited On:2014-09-16
Last Modified:2015-04-28
Downloads:0

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