Xia Lixin, Yang Dongqi, Zhang Hongcui, Zhang Qian, Bu Naishun, Song Peng, Yan Zhuojun, Yuan Ye
College of Chemistry, Liaoning University Shenyang 110036 P. R. China
School of Environmental Science, Liaoning University Shenyang 110036 P. R. China.
RSC Adv. 2019 Jul 3;9(36):20852-20856. doi: 10.1039/c9ra01904a. eCollection 2019 Jul 1.
Radioiodine (I and I) emission from the nuclear waste stream has aroused enormous apprehension because of its quick diffusion and radiological contamination. Conventional porous adsorbents such as zeolites and carbon with rigid skeletons and constant pore volumes reveal a limited performance for reliable storage. Here, a series of soft porous aromatic frameworks (PAFs) with additional π-conjugated fragments is disclosed to serve as physicochemical stable media. Due to the flexibility of the tertiary amine center, the PAF products provide sufficient space for the binding sites, and thus exhibit a considerable capability for iodine capture from both gaseous and soluble environments. The obtained capacity of PAFs is 1.6 times higher than that of PAF-1 which possesses similar aromatic constituents featuring an ultra-large specific surface area (BET = 5600 m g). The novel paradigm of dynamic frameworks is of fundamental importance for designing adsorbents to treat environmental pollution issues.
核废物流中放射性碘（I和I）的排放因其快速扩散和放射性污染而引起了极大的担忧。传统的多孔吸附剂，如具有刚性骨架和恒定孔体积的沸石和碳，在可靠储存方面表现有限。在此，公开了一系列具有额外π共轭片段的软质多孔芳香框架（PAF）作为物理化学稳定介质。由于叔胺中心的灵活性，PAF产品为结合位点提供了足够的空间，因此在气态和可溶性环境中都表现出相当大的碘捕获能力。所获得的PAF容量比具有类似芳香成分且比表面积超大（BET = 5600 m g）的PAF-1高1.6倍。动态框架的新范式对于设计处理环境污染问题的吸附剂至关重要。
