Synthesis of nitrogen-containing covalent organic framework with reversible iodine capture capability

• Published in: Microporous and mesoporous materials 2021-01, Vol.312, p.110739, Article 110739
• Main Authors: Chen, Run, Hu, Tianliang, Zhang, Wei, He, Chiyang, Li, Yongqiang
• Format: Article
• Language: English
• Subjects: Charge-transfer interactions; Iodine capture; Mixed adsorption; Nitrogen-containing covalent organic framework
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2020.110739

The use of covalent organic frameworks (COFs) to cope with environmental issues was promising but making them commercial and practical remains a challenge. In this work, we explored the crystallization of a stable nitrogen-containing covalent organic framework (TAPA-PDA COF) and used it as a porous platform for efficient and reversible volatile iodine capture. The TAPA-PDA COF, prepared by simple, rapid, low temperature reactions, possesses a high BET surface area of over 685 m2/g, good crystallinity, high thermal stability and ultrahigh capture of iodine vapor up to 5.09 g/g, which was significantly higher than most reported iodine adsorbents. Although the Raman spectroscopy confirmed the formation of polyiodide compounds through charge transfer between sorbents and iodine molecules, the TAPA-PDA COF still has the ability to be recycled five times while maintaining a high uptake capacity. This study provides promising strategy to solve the difficult problems of commercializing COFs and utilizing them for practical application. [Display omitted] •The TAPA-PDA COF was constructed as a porous platform for efficient and reversible volatile iodine capture.•The TAPA-PDA COF demonstrated ultrahigh capture of iodine vapor up to 5.09 g/g.•The TAPA-PDA COF's capture of iodine was a hybrid of physisorption and chemisorption.•The simple, fast and low temperature preparation method provides promising strategy to solve the difficult problems of commercializing COFs.