Design and synthesis of stable sp-carbon-linked two-dimensional conjugated covalent organic framework for efficient capture of iodine

共价键 化学 双酚A 材料科学 共价有机骨架 有机化学 化学工程 工程类 环氧树脂
作者
Yulong Xu,Chengxin Wu,Ning Chu,Yanzhi Xing,Jiaxuan Yang,Lilin Yin,Xuwei Chen
出处
期刊:Separation and Purification Technology [Elsevier BV]
卷期号:307: 122776-122776 被引量:13
标识
DOI:10.1016/j.seppur.2022.122776
摘要

The ingenious design of sp2-carbon-linked fully π-conjugated covalent organic frameworks (sp2-c-COFs) with a periodic pore structure and high chemical stability, is vital. However, this remains a significant challenge owing to the poor reversibility of the coupling reactions. Here two novel isoreticular crystalline and highly porous two-dimensional (2D) sp2-c-COFs (COF-p-NEU1 and COF-p-NEU2) are designed and synthesized via a base-catalyzed Knoevenagel polycondensation reaction based on the [C2 + C3] topology diagram. As-prepared polycrystalline COF-p-NEU1 (with 1,3,5-tris(p-formylphenyl)benzene (TFP)) and COF-p-NEU2 (with 1,3,5‐tris‐(4‐formylphenyl) triazine (TFT)) exhibit long-range ordered structures, well-defined nanochannels, and favorable chemical stable, which endow the promising capture performance of COF materials. Meanwhile, the two sp2-c-COF can provide abundant functional units to promote the capture of I2 due to introducing mass nitrogen species into the building block. Therefore, the two nitrogen-rich sp2-c-COFs exhibit a high iodine uptake capacity for iodine vapor and iodine in cyclohexane with 4.58 g g−1 and for 1.31 g g−1 COF-p-NEU1 and 5.87 g g−1 and 1.51 g g−1 for COF-p-NEU2 at 348 K. The results of this study provide a potential path for the design and synthesis of novel sp2-c-COFs materials with high chemical stability and demonstrate the high potential of sp2-c-COF for the capture of radioactive contaminants.
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