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

Abstract

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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“…The EVOH copolymer is a commercial plastic material commonly employed as a gas barrier layer in polylaminate packaging. − ,− It is transparent, biocompatible, and insoluble in water, and it shows good mechanical and thermal properties and processability. , From a chemical point of view, it consists of a unique copolymer of ethylene and vinyl alcohol that can be easily functionalized with various molecules to obtain advanced materials for various applications. − In Figure S1, the chemical structure of EVOH and the commercial EVOH beads are shown.…”

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“…When an oxidized polymer (p-type) is exposed to a reducing agent (CO, NH 3 , CH 4 , H 2 , H 2 S, acetone, or ethanol), its resistivity rises; conversely, when the polymer’s surface reacts with an oxidizing agent (NOx, CO 2 , SO 2 , O 2 , or O 3 ), its resistivity reduces [ 50 , 51 ]. Korent et al [ 52 , 53 ] reported an inexpensive NH 3 sensor based on the polyaniline functionalization of a screen-printed electrode (SPE). The SPE was altered in this study by electrochemically polymerizing polyaniline in HCl.…”

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“…Therefore, some recent research has been focused on the development of hexadentate (3,4-HP)-containing polymers. In particular, aimed to obtain an analytical sensor for Fe(III), a copolymer was obtained from ethylene-vinyl alcohol and a tripodal, 3-hydroxy-4-pyridinone-based chelator (KC18) affording a thin film named 3,4-HP@EVOH ( L34, Figure 9 ) [ 94 ]. Sorption isotherms demonstrated that the polymer is capable of sorbing Fe(III) even at low pH ~ 1.…”