Enrichment of radioiodine accompanied by nuclear fission threatens the health of humans, and efficient capture of iodine has attracted wide public attention in recent years. Here we report a crystalline mesoporous nitrogen-containing covalent organic framework (TAPB-BPDA COF) as a highly efficient iodine adsorbent, which is synthesized by imine condensation reaction between 1,3,5-tris(4-aminophenyl)benzene and 4,4′-biphenyldicarboxaldehyde. The TAPB-BPDA COF possesses permanent porous structure, high BET surface area of 1082 m²/g, excellent chemical and thermal stability and plenty of nitrogen in the skeleton as effective sorption sites. It displays remarkable adsorption of iodine in aqueous solution up to 988.17 mg/g at room temperature. The adsorption kinetics of iodine onto TAPB-BPDA COF is followed the pseudo-second-order kinetic model, and the adsorption isotherm fits well with the Langmuir model. The TAPB-BPDA COF adsorbs iodine through the weak interaction between the benzene ring on its backbone and iodine, and the electron transfer between nitrogen atoms and iodine promotes the adsorption process. Moreover, TAPB-BPDA COF still maintains efficient adsorption performance after five cycles. These results suggest the great potential of TAPB-BPDA COF as a designable porous to address the problem of nuclear fission waste contamination that threatens human health.

伴随着核裂变的放射性碘的富集威胁着人类的健康，近年来，碘的有效捕集引起了公众的广泛关注。在这里，我们报告结晶的介孔含氮共价有机骨架（TAPB-BPDA COF）作为高效的碘吸附剂，它是通过1,3,5-三（4-氨基苯基）苯与4,4之间的亚胺缩合反应合成的′-联苯二甲醛。TAPB-BPDA COF具有永久的多孔结构，高BET表面积为1082 m ²/ g，优异的化学和热稳定性以及骨架中大量的氮作为有效吸附位点。在室温下，它对水溶液中碘的吸附能力高达988.17 mg / g。碘在TAPB-BPDA COF上的吸附动力学遵循拟二级动力学模型，吸附等温线与Langmuir模型非常吻合。TAPB-BPDA COF通过其骨架上的苯环与碘之间的弱相互作用来吸附碘，并且氮原子与碘之间的电子转移促进了吸附过程。而且，TAPB-BPDA COF在五个循环后仍保持有效的吸附性能。这些结果表明，TAPB-BPDA COF作为可设计的多孔材料具有巨大的潜力，可以解决威胁人类健康的核裂变废物污染问题。