4.5 Article

DFO@EVOH and 3,4-HP@EVOH: Towards New Polymeric Sorbents for Iron(III)

Journal

CHEMOSENSORS
Volume 8, Issue 4, Pages -

Publisher

MDPI
DOI: 10.3390/chemosensors8040111

Keywords

iron(III) sorbents; functionalized polymers; ethylene-vinyl alcohol; deferoxamine; tris 3-hydroxy-4-pyridinone

Funding

  1. Fondi Ateneo Ricerca (FAR) of the University of Pavia
  2. FundacAo para a Ciencia e Tecnologia (FCT) [UID/QUI/00100/2019]
  3. COST Action [CA18202]
  4. MIUR

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The paper presents the synthesis and preliminary characterization of two novel solid-phase sorbents for iron(III), resulting from the functionalization of ethylene-vinyl alcohol copolymer (EVOH) with deferoxamine, DFO (DFO@EVOH), and a novel tripodal 3-hydroxy-4-pyridinone, named 3,4-HP (3,4-HP@EVOH). DFO and 3,4-HP have been covalently bonded to EVOH, using carbonyldiimidazole as a coupling agent. Before their use as Fe(III) sorbents, they were warm-pressed to obtain a thin film. Polymers have been characterized by conventional physico-chemical techniques; furthermore, the sorption properties towards Fe(III) were investigated. The physico-chemical characterization of the new solid-state devices demonstrates the effective linkage of the two receptors on the polymeric support. Despite a relatively low sorption capacity for both materials, the stoichiometry and the complexation constants of Fe(III)/DFO@EVOH and Fe(III)/3,4-HP@EVOH are in pretty good agreement with those obtained for the same ligands in aqueous solutions.

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