Key Lab of Eco-Environments Related Polymer Materials of MOE; Key Lab of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, People's Republic of China.
College of Chemistry and Chemical Engineering, Provincial Key Laboratory of Gansu Higher Education for City Environmental Pollution Control, Lanzhou City University, Lanzhou, 730070, People's Republic of China.
Mikrochim Acta. 2020 Jun 6;187(7):374. doi: 10.1007/s00604-020-04292-w.
An Eu(III)-functionalized strontium-organic framework (Eu@Sr-MOF) was synthesized by encapsulating Eu ions into the pores of Sr-MOF via postsynthetic modification (PSM) and fully characterized by XRD, SEM, EDS, FTIR, and TGA. The luminescent properties of Eu@Sr-MOF were measured and investigated in detail, which demonstrated that Eu@Sr-MOF not only possessed excellent water and chemical stabilities in a wide pH range (5-10) but also displayed red luminescence with excitation/emission maxima at 332/617 nm. The Eu@Sr-MOF can be considered as a highly selective and sensitive recyclable luminescence probe for sensing Cr(III) and Cr(VI) based on strong luminescence quenching effects; it can be recycled at least five times. The luminescence probe for Cr, CrO, and CrO shows low detection limits (0.15 μM, 0.17 μM, and 0.13 μM, respectively), relatively broad linear ranges (0.6-150 μM, 0.1-200 μM and 0.4-180 μM, respectively), and high quenching constants K. The signals can be observed by the naked eye under UV light of 365 nm. The method was applied to the determination of total Cr in environmental water samples. Graphical abstract.
通过后合成修饰（PSM）将 Eu 离子封装到 Sr-MOF 的孔中，合成了一种 Eu(III)-功能化锶有机骨架（Eu@Sr-MOF），并通过 XRD、SEM、EDS、FTIR 和 TGA 对其进行了充分的表征。详细测量和研究了 Eu@Sr-MOF 的发光性质，结果表明，Eu@Sr-MOF 不仅在很宽的 pH 范围（5-10）内具有优异的水和化学稳定性，而且在 332/617nm 处显示出激发/发射最大值的红色发光。Eu@Sr-MOF 可以被认为是一种基于强发光猝灭效应的高选择性和高灵敏度的可回收发光探针，用于检测 Cr(III)和 Cr(VI)；它可以至少回收五次。用于 Cr、CrO 和 CrO 的荧光探针具有较低的检测限（分别为 0.15μM、0.17μM 和 0.13μM）、相对较宽的线性范围（分别为 0.6-150μM、0.1-200μM 和 0.4-180μM）和高猝灭常数 K。在 365nm 的紫外光下可以通过肉眼观察到信号。该方法已应用于环境水样中总 Cr 的测定。
