化学
检出限
荧光
铕
金属有机骨架
铀酰
猝灭(荧光)
水溶液
铀
水溶液中的金属离子
化学工程
金属
离子
色谱法
吸附
有机化学
量子力学
工程类
材料科学
冶金
物理
作者
Yuqing Deng,Shan Jiang,Zifei Yan,Youlu Chu,Weibing Wu,Huining Xiao
标识
DOI:10.1016/j.aca.2024.342211
摘要
Radioactive uranium leaks into natural water bodies mainly in the form of uranyl ions (UO22+), posing ecological and human health risks. Fluorescent europium-based metal-organic frameworks (Eu-MOFs) have been demonstrated to be effective fluorescent sensors for UO22+, but the large size, powder state and poor dispersity limit their further application. In this work, fluorescent Eu-MOFs were in-situ grown on TEMPO-oxidized cellulose nanofibers (TOCNFs), which is the first time that spherical Eu-MOF crystals with sizes below 10 nm were prepared. Fluorescence spectral analysis revealed a nine-fold increase in the fluorescence intensity of TOCNF@Eu-MOF compared to Eu-MOF. The nanocomposites achieved rapid and sensitive fluorescence quenching to UO22+ through the "antenna effect" and unsaturated Lewis basic sites on the ligands binding with UO22+. Moreover, TOCNF@Eu-MOF demonstrated excellent selectivity and anti-interference for UO22+ detection. For the nanopaper-based sensor made from TOCNF@Eu-MOF, the Stern-Volmer quenching constant (KSV) was calculated as 8.21 × 104 M−1, and the lowest limit of detection (LOD) was 6.6 × 10−7 M, significantly lower than the 1.32 × 10−6 M of Eu-MOFs. In addition, the nanopaper exhibited good fluorescence stability and cyclic detection performance, enabling the rapid and convenient detection of UO22+ in the aqueous phase within 30 s by simple dipping.
科研通智能强力驱动
Strongly Powered by AbleSci AI