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The capture of radioactive iodine species in nuclear fuel reprocessing and nuclear emergencies is of utmost significance for ensuring nuclear safety, conserving the natural environment, and maintaining the well-being of the public. Previously mentioned materials like zeolites and activated carbons for iodine capture have proven to be less effective under practical changing conditions. As a result, there is a compelling demand for developing adsorbents synthesized by simple approaches that can adsorb iodine from diverse sources with a strong adsorption capacity. In this context, we put forth a design to synthesize the nitrogen-rich porous organic polymers (NRPOP-C2 and NRPOP-C3) using a flexible trialdehyde containing a triazine core structure (TTT) and 4, 4′-oxidianiline (OD) and naphthalene-1, 5-diamine (ND) as monomers, respectively. The covalent linkages between the monomers were achieved via a Schiff base polycondensation reaction. The ample electron-rich aromatic rings and nitrogen centers in the polymeric network enable its efficient interaction with iodine. Certainly, NRPOP-C2 and NRPOP-C3 showed significant capture of iodine from different sources in various environments and temperature conditions for instance, at elevated temperature (75 °C: 7. 16 and 6. 36 g/g), at room temperature (25 °C: 2. 71 and 2. 25 g/g) and in aqueous medium (4680. 6 and 4605. 7 mg/g) at room temperature, respectively. The thermally stable NRPOP-C2 and NRPOP-C3 maintained their capture performance while being recycled. Due to the excellent iodine adsorption capacity and long-term retention capability, NRPOP-C2 and NRPOP-C3 stand out as leading materials for the steady capture and storage of iodine.
Farooq et al. (Thu,) studied this question.