A Carbazole-Functionalized Porous Aromatic Framework for Enhancing Volatile Iodine Capture via Lewis Electron Pairing |
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| Authors: | Zhuojun Yan Bo Cui Ting Zhao Yifu Luo Hongcui Zhang Jialin Xie Na Li Naishun Bu Ye Yuan Lixin Xia |
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| Affiliation: | 1.College of Chemistry, Liaoning University, Shenyang 110036, China; (Z.Y.); (B.C.); (H.Z.); (J.X.); (N.L.);2.School of Environmental Science, Liaoning University, Shenyang 110036, China; (T.Z.); (Y.L.);3.Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China;4.Yingkou Institute of Technology, Yingkou 115014, China |
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| Abstract: | Nitrogen-rich porous networks with additional polarity and basicity may serve as effective adsorbents for the Lewis electron pairing of iodine molecules. Herein a carbazole-functionalized porous aromatic framework (PAF) was synthesized through a Sonogashira–Hagihara cross-coupling polymerization of 1,3,5-triethynylbenzene and 2,7-dibromocarbazole building monomers. The resulting solid with a high nitrogen content incorporated the Lewis electron pairing effect into a π-conjugated nano-cavity, leading to an ultrahigh binding capability for iodine molecules. The iodine uptake per specific surface area was ~8 mg m−2 which achieved the highest level among all reported I2 adsorbents, surpassing that of the pure biphenyl-based PAF sample by ca. 30 times. Our study illustrated a new possibility for introducing electron-rich building units into the design and synthesis of porous adsorbents for effective capture and removal of volatile iodine from nuclear waste and leakage. |
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| Keywords: | iodine capture porous aromatic framework Lewis electron pairing effect Sonogashira-Hagihara cross-coupling |
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