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Zwitterionic, ion-in-conjugation porous polymer networks : synthesis and photooxidation of bisphenol A in water
Aleksander Saša Markovič, Tomaž Kotnik, Sebastijan Kovačič, 2025, original scientific article

Abstract: In this work, we have developed an easy approach for vinylene-linked ion-in-conjugation porous polymer networks (IIC-PPN) using Knoevenagel polycondensation of predesigned zwitterionic N-(3-sulfopropyl)-2,6-(dimethyl)pyridinium salt and 1,3,5-triformylbenzene as monomers. The resulting IIC-PPNs exhibit a porous morphology with high specific surface areas up to 263 m2·g-1. Although the IIC-PPN network contains arylene-vinylene nodes that make it apolar, the incorporation of zwitterionic pyridinium building blocks enable a significant ionic dipole, which is reflected in the water uptake of 14.5 g·g-1, which is higher than that of similar poly(arylene-cyano-vinylene)s with 7.0, 8.5 and 5.3 g·g-1 for PAV–CN, PAV–OMe, and PAV–CHO, respectively. The IIC-PPNs exhibit significant semiconducting properties with optical absorption band edges of 512 nm and an electrochemical band gap of 2.55 eV. The intriguing properties of IIC-PPN prompted us to use them as heterogeneous photocatalysts to photooxidize the endocrine disrupting compound bisphenol A (BPA) dissolved in water under visible light.
Keywords: conjugated polymers, zwitterion, Ion-in-conjugation, IIC, heterogeneous photocatalysis, bisphenol A, BPA
Published in DKUM: 29.05.2025; Views: 0; Downloads: 3
Full text (2,56 MB)

Hierarchically porous polyacetylene networks : adsorptive photocatalysts for efficient bisphenol a removal from water
David Šorm, Jiří Brus, Albin Pintar, Jan Sedláček, Sebastijan Kovačič, 2024, original scientific article

Abstract: In this article, we report a series of functionalizedpolyacetylene-type networks formed by chain-growth insertioncoordination polymerization in high internal phase emulsions(HIPEs). All polymerized HIPEs (polyHIPEs) contain a hierarchi-cally structured, 3D-interconnected porous framework consistingof a micro-, meso- and macropore system, resulting in exception-ally high specific surface areas (up to 1055 m2·g−1) and totalporosities of over 95%. The combination of π-conjugated andhierarchically porous structure in one material enabled the use ofthese polyacetylene polyHIPEs as adsorptive photocatalysts for theremoval of chemical contaminants from water. All polyacetylenepolyHIPEs demonstrated high efficiency in the adsorption ofbisphenol A from water (up to 48%) and the subsequentphotocatalytic degradation. Surprisingly, high adsorption capacitydid not affect the photocatalytic efficiency (up to 58%). On the contrary, this dual function seems to be very promising, as somepolyacetylene polyHIPEs almost completely removed bisphenol A from water (97%) through the adsorption-photooxidationmechanism. It also appears that the presence of polar functional side groups in the polyacetylene backbone improves the contact ofthe polyacetylene network with the aqueous bisphenol A solution, which can thus be more easily adsorbed and subsequentlyoxidized, compensating for the lower specific surface area of some networks, namely, 471 and 308 m2·g−1 in the case of 3-ethynylphenol- and 3-ethynylaniline-based polyacetylene polyHIPEs, respectively.
Keywords: polyacetylenes, emulsion-templating, π-conjugated networks, macroporous polymers, heterogeneous photocatalysis
Published in DKUM: 29.08.2024; Views: 73; Downloads: 63
Full text (6,79 MB)
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