Cotton fiber functionalized with 2D covalent organic frameworks for iodine capture
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By using a rapid cryogenic reaction, cotton fiber was covalently functionalized with imine-linked two-dimensional covalent organic frameworks (2D COFs), which was synthesized via an imine condensation reaction between 1,3,5-tris(4-aminophenyl)benzene and terephthaldehyde. The resulting functionalized cotton (COFs@cotton) was characterized by fourier transform infrared spectroscopy, powder X-ray diffraction, scanning electron microscope, thermo-gravimetric analysis, nitrogen adsorption–desorption analysis and elemental analysis. The presence of a lot of imine functional groups in combination with dispersed mesoporous holes results in rapid adsorption rate and relatively high iodine affinity with uptake capacities up to 533.9 mg/g, which was much higher than that of untreated cotton. In addition, COFs@cotton also shows remarkable capability as absorbent for iodine in solution. The adsorbed iodine can be completely extracted from COFs@cotton by being washed with ethanol, permitting the simple reuse of adsorbent. This new functionalization approach can be applied to different kind of imine-linked COFs, and the corresponding adsorbents show more extensive practical application prospect for iodine capture.
KeywordsCotton fiber Covalent organic framework Covalent grafting Rapid capture Iodine
This work was financially supported by the National Nature Science Foundation of China (No. 21277106), the Nature Science Foundation of Hubei Province (No. 2017CFA026) and the innovation project of Wuhan Textile University (No. X201910495001). The contributions of all former and current lab members and students (Minhui Xie, Tiantian Xion and Maokun Tan) were thankfully acknowledged.
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Conflict of interest
The author declares that they have no conflict of interest.
- El-Mahdy AFM, Young C, Kim J, You J, Yamauchi Y, Kuo SW (2019) Hollow microspherical and microtubular [3 + 3] carbazole-based covalent organic frameworks and their gas and energy storage applications. ACS Appl Mater Interfaces 11:9343–9354. https://doi.org/10.1021/acsami.8b21867 CrossRefPubMedGoogle Scholar
- Geng T, Ye S, Zhu Z, Zhang W (2018) Triazine-based conjugated microporous polymers with N,N,N′,N′-tetraphenyl-1,4-phenylenediamine, 1,3,5-tris(diphenylamino)benzene and 1,3,5-tris[(3-methylphenyl)-phenylamino]benzene as the core for high iodine capture and fluorescence sensing of o-nitrophenol. J Mater Chem A 6:2808–2816. https://doi.org/10.1039/c7ta08251g CrossRefGoogle Scholar
- Lv LL, Yang J, Zhang HM, Liu YY, Ma JF (2015) Metal-ion exchange, small-molecule sensing, selective dye adsorption, and reversible iodine uptake of three coordination polymers constructed by a new resorcinarene-based tetracarboxylate. Inorg Chem 54:1744–1755. https://doi.org/10.1021/ic502686b CrossRefPubMedGoogle Scholar