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

Abstract

Four kinds of porous aminal‐linked organic polymers (PAOPs) were synthesized via one‐step condensation between cheap melamine and respective aldehydes decorated with different nitrogen heterocycle, to evaluate the influence of nitrogen heterocycle on the adsorption performance of target polymer toward iodine. Though having the smallest surface area of 209.9 m2/g, PAOP‐4 decorated with pyridine group exhibits an adsorption capacity of 108 wt% (iodine/adsorbent weight%), surpassing other three PAOPs with Brunauer–Emmett–Teller area varying from 305.8 to 533.0 m2/g. Based on Raman spectral analyses, the characteristic band of I3− and I5− was used to evaluate the electronic interaction between iodine and the nitrogen heterocycle, giving an order of pyridine > tetrazole > pyrazole > imidazole. This manifests the vital role of chemical interaction playing in the iodine adsorption by PAOP‐4, which is much helpful for designing high‐performance organic adsorbent toward iodine.

Selective Carbon Dioxide Capture and Ultrahigh Iodine Uptake by Tetraphenylethylene-Functionalized Nitrogen-Rich Porous Organic Polymers

“…Furthermore, the relatively smaller pore size distribution in TTPOP-S may contribute to its higher surface area when compared to that of TTPEOP-O. The observed surface areas are comparable with the recently reported aminal-linked porous organic polymers. ,, Both adsorption isotherms show a steep increase at lower pressure ( P / P 0 < 0.05) followed by a decline in the slope at a higher pressure range (0.05–0.9) confirming the microporous nature of both POPs (Figure A). The fitting of the N 2 adsorption isotherms at 77 K to the QSDFT model for slit and cylindrical pores for carbon revealed the average pore size distribution in both TTPEPOPs centered at about 0.783 nm for TTPEPOP-O and 0.518 nm for TTPEPOP-S with total pore volumes of 0.822 and 1.468 cm 3 g –1 (at P / P 0 = 0.95), respectively (Table ).…”

Spiro-fused bicyclo[3,2,2] octatriene-cored triptycene: synthesis, molecular packing, and functional aggregates

“…Thus, we examined the interaction of these porous organic crystals with I 2 molecules (Figure 5c). I 2 can directly affect the metabolic process; its radioactive volatile form has become one of the primary concerns regarding environmental toxicity [54]. Furthermore, for organic photoelectric devices, I 2 adsorption treatment can improve the electron mobility of molecular crystal materials [55].…”

Progress in the Synthesis and Application of Aminals: Scaffolds for Molecular Diversity

“…Regarding this topic, others have continued the development of ever-more efficient aminal-based polymers for iodine adsorption. 152,153,164 Rong et al 165 went one step further and prepared a multifunctional microporous aminal-linked polymer for the adsorption of organic vapors, H2, volatile iodine and CO2. The latter was also explored by Li et al 166 and Senthilkumaran et al 167 in the development of porous polyaminals polymers with high CO2 adsorption capacity.…”