A Sponge‐Like 3D‐PPy Monolithic Material for Reversible Adsorption of Radioactive Iodine

Abstract

3D polypyrrole (3D‐PPy) monolith is prepared by a simple chemical oxidation of pyrrole monomer using FeCl3 as an oxidant. The as‐prepared PPy monolith exhibits an abundant porosity and with a mesopore size of about 9.1 nm in diameter. Taking advantage of its mesoprous feature as well as the unique chemical composition, the 3D‐PPy is employed as the porous medium for adsorption and removal of radioactive iodine from environment. A high iodine adsorption capacity of 1.6 g g−1 for 3D‐PPy is obtained which is competing with that of those reported porous organic polymers. Besides, the adsorption kinetics and adsorption thermodynamic experiments show that the adsorption is dominated by the pseudosecond‐order kinetics and Langmuir models. Considering its simple and low cost‐effective preparing method, unique monolithic porous as well as π–π conjugated chemical structure, the resulted 3D‐PPy may be found useful applications for removal of radioactive iodine to address environmental issues.

Improving iodine adsorption performance of porous organic polymers by rational decoration with nitrogen heterocycle

“…This promotes the designing and preparation of high-performance adsorbent. [3][4][5] Up to now many kinds of adsorbent have been developed for iodine capture, including activated carbon, 6,7 zeolites, 8,9 metal organic frameworks (MOFs), [10][11][12] and so on. However, it is still a great challenge to develop effective and inexpensive adsorbents.…”

Sub‐Nanoporous Engineered Fibrous Aerogel Molecular Sieves with Nanogating Channels for Reversible Molecular Separation

“…With the integrated sub‐1 nm cages and polar channel surface, the NAMS‐8 could serve as a molecular separation module in a polar sieving mode, as shown in Figure 3b, linear EG molecular clusters could aggregate inside the ordered mesoporous channels due to the capillary condensation and these EG molecules would further diffuse into secondary micropores especially sub‐1 nm pores and tightly anchor on the pore walls due to the amplified polar adsorption potential and strong hydrogen binding force. [ 18 ] Instead, the NAMS‐2 with intrinsic π‐conjugated sub‐nanoporous cages could act as a nonpolar molecular sieving module. As shown in Figure 3c, TB molecules would go through the tortuous diffusion inside worm‐like meso/macrochannels of NAMS‐2 and the diffused adsorbates could further fill into the secondary micropores and sub‐1 nm cages due to the synergistic effect of strong nonpolar adsorption potential and delocalized π–π interactions between TB molecules and sub‐nanoporous aromatic π‐conjugated walls.…”

Tailoring Nanoporous-Engineered Sponge Fiber Molecular Sieves with Ternary-Nested Architecture for Precise Molecular Separation

“…Second, sponge fibers exhibited obviously different adsorption energy based on π–π interactions toward AP and PE; thus the PEFS membranes with abundant sorption sites exhibited a superior selective sorption behavior of AP over PE. Moreover, PEFSs prepared in this work exhibited typical nonpolar skeletons consisting of numerous cross-linked benzene rings; thus the π–π interactions between bulk π-electron systems on pore walls of fibers and organic molecules with benzene rings would be a very significant factor. , We conduct the molecular dynamics simulations by the sorption modulus of Materials Studio 8.0 to investigate adsorption energies of AP and PE on polymer network systems of sponge fibers. The optimized adsorption configurations between adsorbate molecules and molecular systems of sponge fibers are illustrated in Figure S19, where the calculated adsorption energies are also listed.…”