Abstract Herein, titanium based metal organic framework (MOF) i.e. NH2-MIL-125(Ti) has been successfully fabricated via solvothermal route using titanium isopropoxide and 2-aminoterephthalic acid as starting materials. The characterization and evaluation of structural, morphological and compositional analysis were done using several analytical techniques such as XRD, FTIR, BET surface area, XPS, FE-SEM and HR-TEM. Furthermore, the synthesized MOF's performance was explored as an efficient fluorescent probe for the quantification of transition metal ions. The results revealed that NH2-MIL-125(Ti) was strongly specific and sensitive to Cu(II) ions. Remarkably, the fluorescence intensity of NH2-MIL-125(Ti) decreased proportionally towards the concentration of Cu(II) ions. The sensor provides a useful platform for the detection of Cu(II) ions in the linear range 0–72 μM with a detection limit of 0.72 μM, besides, the value of Stern-Volmer constant was found to be 3.2 × 104 M−1. Moreover, NH2-MIL-125(Ti) as a Cu(II) sensor can be simply recycled affirming its high stability, which reveals NH2-MIL-125(Ti) as a prospective fluorescent probe. The prepared sensor was also applied for the determination of Cu(II) ions in real water samples to test its practical utility.

中文翻译：

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胺功能化钛金属有机骨架 (NH2-MIL-125(Ti))：一种新型荧光传感器，用于高选择性检测铜离子

摘要 在此，以异丙醇钛和2-氨基对苯二甲酸为原料，通过溶剂热法成功制备了钛基金属有机骨架（MOF）即NH2-MIL-125(Ti)。使用多种分析技术，如 XRD、FTIR、BET 表面积、XPS、FE-SEM 和 HR-TEM，对结构、形态和成分分析进行表征和评估。此外，合成的 MOF 的性能被探索为一种有效的荧光探针，用于量化过渡金属离子。结果表明，NH2-MIL-125(Ti) 对 Cu(II) 离子具有很强的特异性和敏感性。值得注意的是，NH2-MIL-125(Ti) 的荧光强度与 Cu(II) 离子的浓度成正比。该传感器为检测线性范围为 0-72 μM 的 Cu(II) 离子提供了一个有用的平台，检测限为 0.72 μM，此外，发现 Stern-Volmer 常数值为 3.2 × 104 M-1 . 此外，NH2-MIL-125(Ti) 作为 Cu(II) 传感器可以简单地回收利用，证实了其高稳定性，这表明 NH2-MIL-125(Ti) 作为一种前瞻性荧光探针。所制备的传感器还用于测定实际水样中的 Cu(II) 离子以测试其实际效用。