Feng Tiantian, Zhao Shilei, Cao Meng, Du Xinfeng, Wang Hui, Cao Xuewen, Feng Lijuan, Yuan Yihui, Wang Ning
State Key Laboratory of Marine Resource Utilization in South China Sea, Collaborative Innovation Center of Marine Science and Technology, Hainan University, Haikou 570228, China.
State Key Laboratory of Marine Resource Utilization in South China Sea, Collaborative Innovation Center of Marine Science and Technology, Hainan University, Haikou 570228, China.
Sci Bull (Beijing). 2025 Jan 15;70(1):70-77. doi: 10.1016/j.scib.2024.08.013. Epub 2024 Aug 16.
Uranium pollution has become a serious threat to human health and environmental safety, making the detection of environmental uranium contamination of great importance. The sensitive and specific detection of uranyl ions, which are the dominant form of uranium in the environment, depends on the specific recognition of uranyl ions by chemical groups. In this study, a novel fluorescent sensor containing a highly specific uranyl ion recognition group is synthesized via the reaction of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) and 1,1,2,2-tetra(4-carboxylphenyl)ethylene (TPE-(COOH)). Owing to the effects of aggregation-induced emission (AIE) and intramolecular charge transfer (ICT), the fluorescent sensor, named TPE-EDC, exhibits significant fluorescent properties in aqueous environments. The binding of uranyl ions by specific recognition groups in TPE-EDC leads to a decrease in the ICT effect, thus causing a significant reduction in the emission intensity of TPE-EDC. The attenuation of the fluorescence intensity of TPE-EDC shows an excellent linear relationship with an increase in uranyl ion concentration. TPE-EDC exhibits ultra-sensitive and ultra-selective detection ability for uranyl ions with an ultra-low detection limit of 69 pmol/L and an ultrashort response time of 30 s. These high detection performances render the fluorescent sensor TPE-EDC a promising candidate for early warning of uranium pollution.
铀污染已对人类健康和环境安全构成严重威胁，因此环境铀污染检测至关重要。环境中铀的主要存在形式是铀酰离子，对其进行灵敏且特异的检测依赖于化学基团对铀酰离子的特异性识别。本研究通过1-乙基-3-(3-二甲基氨基丙基)碳二亚胺（EDC）与1,1,2,2-四(4-羧基苯基)乙烯（TPE-(COOH)）反应，合成了一种含有高特异性铀酰离子识别基团的新型荧光传感器。由于聚集诱导发光（AIE）和分子内电荷转移（ICT）的作用，该荧光传感器TPE-EDC在水环境中表现出显著的荧光特性。TPE-EDC中特异性识别基团与铀酰离子的结合导致ICT效应减弱，从而使TPE-EDC的发射强度显著降低。TPE-EDC荧光强度的衰减与铀酰离子浓度的增加呈现出良好的线性关系。TPE-EDC对铀酰离子具有超灵敏和超选择性检测能力，检测限低至69 pmol/L，响应时间短至30 s。这些高检测性能使荧光传感器TPE-EDC成为铀污染预警的有潜力候选者。
