Zhang Suming, Wu Siyu, Zhang Cheng, Cao Doudou, Song Yingbo, Zheng Yue, Cao Jiarui, Luo Lu, Yang Yajie, Zheng Xiangjun, Yuan Ye
Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, China.
Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China.
Molecules. 2025 Apr 25;30(9):1920. doi: 10.3390/molecules30091920.
Uranium plays an important role in the modern nuclear industry. However, such a radioactive element can also cause severe damage to the environment once leaked or discharged into water or air, having a huge impact on the safety of the biosphere. In this work, we pioneered the use of fluorescent monomers as imprinted units, which promoted fluorescence emission of the material. A novel porous aromatic framework was obtained with uranyl ion chelating sites, namely MIPAF-15. The unique N-O chelating pockets on the 4-bromo-1--indole-7-carboxylic acid gave rise to high coordination affinity toward uranyl ions, which enabled the fast adsorption rate of uranyl ions and a uranyl ion adsorption capacity of 44.88 mg·g at 298 K with an initial pH value of 6.0 and the uranyl concentration of 10 ppm. At the same time, the fluorescence quenching effect of MIPAF-15 was observed upon its adsorption of uranyl ions, which allowed the selective detection of uranyl ions with a detection limit of 5.04 × 10 M, lower than the maximum concentration of uranyl ions in drinking water specified by the World Health Organization (6.30 × 10 M) and United States Environmental Protection Agency (1.11 × 10 M). This kind of multifunctional porous material produces a favorable pathway for the detection, removal and degeneration of highly pollutive ions, promoting the overall sustainable development of the natural environment.
铀在现代核工业中发挥着重要作用。然而，这种放射性元素一旦泄漏或排放到水或空气中，也会对环境造成严重破坏，对生物圈安全产生巨大影响。在这项工作中，我们率先使用荧光单体作为印迹单元，这促进了材料的荧光发射。获得了一种具有铀酰离子螯合位点的新型多孔芳香框架，即MIPAF-15。4-溴-1-吲哚-7-羧酸上独特的N-O螯合口袋对铀酰离子具有高配位亲和力，这使得铀酰离子的吸附速率快，在298K、初始pH值为6.0且铀酰浓度为10ppm时，铀酰离子吸附容量为44.88mg·g 。同时，观察到MIPAF-15吸附铀酰离子时的荧光猝灭效应，这使得能够选择性检测铀酰离子，检测限为5.04×10 M，低于世界卫生组织（6.30×10 M）和美国环境保护局（1.11×10 M）规定的饮用水中铀酰离子的最大浓度。这种多功能多孔材料为高污染离子的检测、去除和降解提供了一条有利途径，促进了自然环境的整体可持续发展。
