Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Gehu Rd, Changzhou, Jiangsu Province, 213164, PR China; Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, 2019 Jia Luo Road, Shanghai, 201800, PR China.
Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, 2019 Jia Luo Road, Shanghai, 201800, PR China.
Talanta. 2023 Jan 15;252:123894. doi: 10.1016/j.talanta.2022.123894. Epub 2022 Aug 30.
Sensitization of Cr(VI) oxyanions in environmentally or industrially relevant aquatic media is highly desired owning to their biological toxicity and essential role in nuclear fuel cycle. However, many chemosensors of CrO and CrO suffer from critical drawbacks, including insufficient sensitivity, selectivity, and/or hydrolytic stability. In this work, we prepared a hydrolytically stable metal-organic framework, namely Hf-BITD, which can retain its crystallinity and structural integrity in solutions over a wide pH range (0-12) and in 3 M HCl. The strong emission via rigidifying fluorescent linkers allows for sensing of CrO and CrO in a luminescence quenching manner, with excellent linear correlations (I/I = 1+ K [Q]) in the ranges of 0-80 μM and 0-50 μM for CrO and CrO, respectively. The adsorption of Cr(VI) oxyanions and the concomitant resonance energy transfer between framework and analysts efficiently turn the emission of Hf-BITD off, which allows for selective recognition of CrO and CrO with detection limits of 0.38 nM and 0.33 nM, respectively. Furthermore, fabrication of Hf-BITD incorporating PVDF membrane makes Hf-BITD@PVDF a promising candidate for facile and effective sensitization of Cr(VI) oxyanions.
由于 Cr(VI) 含氧阴离子在环境或工业相关的水生介质中具有生物毒性和在核燃料循环中的重要作用，因此人们非常希望能够将其敏化。然而，许多 CrO 和 CrO 的化学传感器都存在一些关键的缺陷，包括灵敏度、选择性和/或水解稳定性不足。在这项工作中，我们制备了一种水解稳定的金属有机骨架，即 Hf-BITD，它在很宽的 pH 值范围（0-12）和 3 M HCl 中都能保持其结晶度和结构完整性。刚性荧光连接体的强发射允许以发光猝灭的方式感测 CrO 和 CrO，对于 CrO 和 CrO，分别在 0-80 μM 和 0-50 μM 的范围内具有优异的线性相关性（I/I = 1+ K [Q]）。Cr(VI) 含氧阴离子的吸附以及框架和分析物之间的共振能量转移有效地使 Hf-BITD 的发射关闭，这使得能够选择性地识别 CrO 和 CrO，其检测限分别为 0.38 nM 和 0.33 nM。此外，将 Hf-BITD 掺入 PVDF 膜中，使得 Hf-BITD@PVDF 成为一种很有前途的候选材料，可以方便有效地敏化 Cr(VI) 含氧阴离子。
