Nitrogen‐rich porous polyaminal network as a platform for iodine adsorption through physical and chemical interaction

Abstract

A series of nitrogen-rich porous polyaminal networks (PANs) with five different linkages were prepared through a facile route from cost-effective starting materials. Each structural unit bears a different number of phenyl and pyrrolyl rings, which are found to be useful for iodine uptake through a physical adsorption mechanism. The PAN3 bearing the 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BDP) units, which could adsorb iodine by both physical and chemical interaction, achieves an efficient iodine capacity up to 2.81 g/g. Significantly, these new nitrogen-rich PANs might be useful for capture of other volatile compounds.

Emerging Functional Porous Polymeric and Carbonaceous Materials for Environmental Treatment and Energy Storage

“…Iodine uptake [88] PAN3 Phenyl and pyrrolyl rings Iodine uptake [89] MelPOP-2 and TatPOP-2 50.5 and 36.5 Phosphorus and nitrogen heteroatoms, and p-π conjugated units Iodine uptake [90] COF-DL229 1762 π-conjugated pore walls Iodine uptake [91] CalPOF Azo groups, macrocyclic π-rich cavities and phenolic units Iodine uptake [92] PHF-1-Ct Positive charge and nitrogen Iodine uptake [93] PSIFs Imine groups and silsesquioxane Iodine uptake [94] HCMP-1, 2, 3, 4 Amine groups Iodine uptake [95] Azo-Trip 510. different mechanisms of separation, we will summarize the novel porous polymers in both adsorption and membrane separation area. As a kind of traditional ion-exchange resins, crosslinked polystyrene-based resins and their carbonized derivatives have found wide applications in material adsorption, extraction, and analysis.…”

“…The enhanced adsorption performance can be realized by presetting N heteroatomic units, such as amine, imine, pyrrole, and other N containing rings. [88][89][90][92][93][94][95][96][97][98]100] The π-conjugated structure in aromatic frameworks also increased the adsorption affinity to iodine species. [88,[90][91][92]97,99] Moreover, other heteroatoms (P, S, and B), [87,90,100] phenolic groups, [92] and charged groups [86,93] are also beneficial to elevate the uptake performance.…”

Fluorescent aminal linked porous organic polymer for reversible iodine capture and sensing

“…It has been reported that iodine sequestration efficiency is a function of several structural properties of the adsorbent including surface area, pore size, specific high-affinity binding sites, polar groups, and conjugated units. Thus, increasing the affinity of the host to iodine, in addition to enhanced surface area, can have tremendous effect on iodine capture 4 , 5 , 14 , 15 . Materials like activated carbon, silica, silver-doped zeolites, chalcogenide aerogels, and microporous polymers have been reported to show good adsorption capacities for radioiodine 5 , 16 , 17 .…”

“…More recently, Pan et al developed N-and S-rich covalent organic framework (COFs) possessing high iodine uptake of 276 wt.% 29 . Triazine-based conjugated polymers have also been reported to have respectable iodine uptake, presumably due to their nitrogen-rich nature 4,15,[30][31][32][33][34][35] . The high number of basic nitrogen sites on the triazine unit enhances the uptake capacity that originates from the formation of charge-transfer complexes of nitrogen-iodine (donor-acceptor) systems formed during iodine adsorption on the polymers 7,12,15,36 .…”

“…Triazine-based conjugated polymers have also been reported to have respectable iodine uptake, presumably due to their nitrogen-rich nature 4,15,[30][31][32][33][34][35] . The high number of basic nitrogen sites on the triazine unit enhances the uptake capacity that originates from the formation of charge-transfer complexes of nitrogen-iodine (donor-acceptor) systems formed during iodine adsorption on the polymers 7,12,15,36 . Geng et al constructed a series of novel triazine-based conjugated microprous polymers (TCMPs) applying the Friedel-Crafts polymerization reactions 12,32,37,38 .…”