Wang Chang, Wang Yu, Ge Rile, Song Xuedan, Xing Xueqing, Jiang Qike, Lu Hui, Hao Ce, Guo Xinwen, Gao Yanan, Jiang Donglin
Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, China.
State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, China.
Chemistry. 2018 Jan 12;24(3):585-589. doi: 10.1002/chem.201705405. Epub 2017 Dec 14.
Using porous materials to cope with environmental issues is promising but remains a challenge especially for removing the radioactive vapor wastes in fission because of harsh adsorption conditions. Here we report a new, stable covalent organic framework (COF) as a porous platform for removing iodine vapor-a major radioactive fission waste. The three-dimensional COF consists of a diamond topology knotted by adamantane units, creates ordered one-dimensional pores and are highly porous. The COF enables the removal of iodine vapor via charge transfer complex formation with the pore walls to achieve exceptional capacity. Moreover, the 3D COF is "soft" to trigger structural fitting to iodine while retaining connectivity and enables cycle use for many times while retaining high uptake capacity. These results set a new benchmark for fission waste removal and suggest the great potential of COFs as a designable porous material for challenging world-threatening pollution issues.
使用多孔材料来应对环境问题前景广阔，但仍是一项挑战，特别是对于处理裂变过程中产生的放射性蒸汽废物而言，因为吸附条件苛刻。在此，我们报告一种新型、稳定的共价有机框架（COF），作为用于去除碘蒸汽（一种主要的放射性裂变废物）的多孔平台。这种三维COF由金刚烷单元连接而成的金刚石拓扑结构组成，形成有序的一维孔道且具有高度多孔性。该COF通过与孔壁形成电荷转移络合物来实现碘蒸汽的去除，从而具备卓越的吸附能力。此外，这种三维COF具有“柔性”，能够在保持连接性的同时触发结构适配碘，并且能够多次循环使用，同时保持高吸附容量。这些结果为裂变废物的去除树立了新的标杆，并表明COF作为一种可设计的多孔材料，在应对威胁全球的污染问题方面具有巨大潜力。
