Synthesis of fully sp²-carbon conjugated covalent organic frameworks (COFs) is generally considered extremely challenging due to the low reversibility of the CC bond. Herein, a novel sp²-carbon conjugated COF material, named sp²c-TFPA-pXD, was prepared by Knoevenagel reaction employing tris(4-formylphenyl)amine with triangular geometry as the knot and p-xylylene dicyanide with symmetric structure as the linker unit. The CC linkages topologically connect the two precursors to a fully sp²-carbon conjugated 2D lattice and develop an eclipsed layer framework, giving sp²c-TFPA-pXD outstanding stability. The prepared sp²c-TFPA-pXD does not decompose in nitrogen atmosphere up to 323 °C, and can be stably present in boiling water, acids, bases and common organic solvents. The excellent chemical and thermal stability of sp²c-TFPA-pXD makes it suitable for the harsh environment of radioiodine treatment. In fact, sp²c-TFPA-pXD shows moderate iodine capture capacity in iodine vapor (1.22 g/g), and also shows acceptable iodine capture performance under real industrial conditions of high temperatures and low iodine concentrations. The iodide capture properties of sp²c-TFPA-pXD can be attributed to its regular channels and sp²-carbon conjugate structure. In addition, sp²c-TFPA-pXD can be reused by simple ethanol soaking treatment, and can almost maintain its original iodine capture performance after five cycles. In addition, sp²c-TFPA-pXD also displays noteworthy capability as adsorbent for iodine in cyclohexane solution. Our study confirms that sp²c-TFPA-pXD is an excellent candidate material for capturing iodine from air and solutions in harsh environments. We hope that the report of sp²c-TFPA-pXD for iodine capture could open up new avenues for sp²-carbon conjugated COFs applications and encourage more research to explore the radioiodine capture potential of other stable COFs.

由于 C C 键的低可逆性，通常认为全 sp ²碳共轭共价有机骨架 (COF) 的合成极具挑战性。在此，以具有三角形几何结构的三(4-甲酰基苯基)胺为结，以具有对称结构的对苯二甲苯二氰化物为结，通过Knoevenagel反应制备了一种新型sp 2 -碳共轭COF材料，命名为sp 2 c-TFPA ^- pXD ^。链接器单元。C C 连接将两个前体拓扑连接到完全 sp ² -碳共轭二维晶格并形成重叠层框架，从而赋予 sp ² c-TFPA-pXD 出色的稳定性。准备好的sp ²c-TFPA-pXD 在高达 323 °C 的氮气气氛中不分解，可稳定存在于沸水、酸、碱和普通有机溶剂中。^{sp 2} c-TFPA-pXD优异的化学和热稳定性使其适用于放射性碘处理的恶劣环境。事实上，sp ² c-TFPA-pXD 在碘蒸气中显示出中等的碘捕获能力 (1.22 g/g)，并且在高温和低碘浓度的实际工业条件下也显示出可接受的碘捕获性能。^{sp 2} c-TFPA-pXD的碘化物捕获特性可归因于其规则通道和 sp ² -碳共轭结构。此外，sp ²c-TFPA-pXD通过简单的乙醇浸泡处理即可重复使用，经过5次循环后几乎可以保持原有的碘捕获性能。此外，sp ² c-TFPA-pXD 作为环己烷溶液中的碘吸附剂也表现出值得注意的能力。我们的研究证实，sp ² c-TFPA-pXD 是用于在恶劣环境中从空气和溶液中捕获碘的优秀候选材料。^{我们希望 sp 2} c-TFPA-pXD 用于碘捕获的报告能够为 sp ² -碳共轭 COF 的应用开辟新的途径，并鼓励更多的研究来探索其他稳定 COF 的放射性碘捕获潜力。