Zhen Deshuai, Liu Chunlin, Deng Qiuhui, Li Le, Grimes Craig A, Yang Shengyuan, Cai Qingyun, Liu Yu
Hunan Key Laboratory of Typical Environment Pollution and Health Hazards, School of Public Health, Hengyang Medical School, University of South China, Hengyang 421001, PR China.
State Key Laboratory of Chemo/Biosensing and Chemometrics, School of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR China.
ACS Appl Mater Interfaces. 2024 May 29;16(21):27804-27812. doi: 10.1021/acsami.4c05522. Epub 2024 May 17.
Monitoring and purification of uranium contamination are of great importance for the rational utilization of uranium resources and maintaining the environment. In this work, an olefin-linked covalent organic framework (GC-TFPB) and its amidoxime-modified product (GC-TFPB-AO) are synthesized with 3-cyano-4,6-dimethyl-2-hydroxypyridine (GC) and 1,3,5-tris(4-formylphenyl) benzene (TFPB) by Knoevenagel condensation. GC-TFPB-AO results in specificity for rapid fluorescent/smartphone uranyl ion (UO) detection based on the synergistic effect of multifunctional groups (amidoxime, pyridine, and hydroxyl groups). GC-TFPB-AO features a rapid and highly sensitive detection and adsorption of UO with a detection limit of 21.25 nM. In addition, it has a good recovery (100-111%) for fluorescence detection in real samples, demonstrating an excellent potential of predesigned olefin-linked fluorescent COFs in nuclear contaminated wastewater detection and removal.
监测和净化铀污染对于铀资源的合理利用和环境保护至关重要。在本工作中，通过Knoevenagel缩合反应，以3-氰基-4,6-二甲基-2-羟基吡啶（GC）和1,3,5-三（4-甲酰基苯基）苯（TFPB）合成了一种烯烃连接的共价有机框架（GC-TFPB）及其偕胺肟改性产物（GC-TFPB-AO）。基于多功能基团（偕胺肟、吡啶和羟基）的协同效应，GC-TFPB-AO对快速荧光/智能手机铀酰离子（UO）检测具有特异性。GC-TFPB-AO具有快速且高度灵敏的UO检测和吸附性能，检测限为21.25 nM。此外，它在实际样品的荧光检测中具有良好的回收率（100-111%），表明预设计的烯烃连接荧光共价有机框架在核污染废水检测和去除方面具有优异的潜力。
