Abstract

Clean energy nuclear power generation is always accompanied by the release of harmful radioactive iodine. Therefore, developing efficient adsorbents has become a universal strategy to deal with this problem. Two distinct porous organic polymers (BTM-POP and DAB-POP) containing dipyridine units and benzimidazole structure were synthesized by 5,5'-([2,2'-bipyridine]-5,5'-diyl) diisophthalaldehyde with 1,2,4,5-benzenetetramine (BTM) or 3,3'-diaminobenzidine (DAB), respectively. The structures and morphologies of BTM-POP and DAB-POP were confirmed through Fourier transform infrared (FT-IR) spectroscopy, N2 sorption isotherm measurement and scanning electron microscopy (SEM). Furthermore, iodine vapor capture of BTM-POP and DAB-POP reach 3.26 g g-1 and 3.58 g g-1, respectively. Mechanism study reveals that the adsorbed iodine in the material mainly exists in the form of I3- and I5- and the adsorption sites are mainly bipyridine and benzimidazole units. The results show that two POPs exhibit good thermal/chemical stability, high pore properties, and offer more adsorption sites. In combination with rich N atom content, large conjugated structure, synergistically influences the iodine vapor capture capacity of POPs.

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