Yang Huan, Chen Xin, Yu Yaling, Liang Changjin, Wu Yunying, Qiu Boxin, Zhang Chenyang, Lin Shaomin
School of Materials Science and Engineering, Hanshan Normal University Chaozhou 521041 China
Advanced Ceramic Materials Innovation Research Center, Hanshan Normal University Chaozhou 521041 China.
RSC Adv. 2025 Aug 22;15(36):29720-29726. doi: 10.1039/d5ra03729h. eCollection 2025 Aug 18.
This study presents the synthesis of a strontium-based metal-organic framework (Sr-BDC) through a solvothermal method, employing strontium chloride and terephthalic acid as primary precursors. The as-prepared Sr-BDC was subsequently functionalized with terbium ions (Tb) to yield a Tb@Sr-BDC composite. Extensive structural characterization, including X-ray diffraction (XRD), thermogravimetric analysis (TG), and the scanning electron microscope (SEM), confirmed that the Tb incorporation preserved the integrity of the Sr-MOF framework without inducing structural degradation. Photoluminescence analysis demonstrated that Tb@Sr-BDC exhibits distinct Tb emission peaks at 545 nm upon excitation at 294 nm, showcasing exceptional selectivity and sensitivity toward Fe ions. Stern-Volmer quenching analysis revealed a remarkably low detection limit of 7.3 × 10 mol L for Fe, with a linear response range spanning from 5 × 10 to 1 × 10 mol L. The potential mechanisms responsible for Fe-induced fluorescence quenching in Tb@Sr-BDC was also analysised in the study. These results underscore the potential of Tb@Sr-BDC as a highly efficient fluorescent probe for applications in environmental monitoring and biomedical sensing.
本研究通过溶剂热法，以氯化锶和对苯二甲酸作为主要前驱体，合成了一种锶基金属有机框架材料（Sr-BDC）。随后，将制备好的Sr-BDC用铽离子（Tb）进行功能化处理，得到Tb@Sr-BDC复合材料。包括X射线衍射（XRD）、热重分析（TG）和扫描电子显微镜（SEM）在内的广泛结构表征证实，铽的掺入保持了Sr-MOF框架的完整性，未引起结构降解。光致发光分析表明，在294 nm激发下，Tb@Sr-BDC在545 nm处呈现出明显的铽发射峰，对铁离子表现出优异的选择性和灵敏度。斯特恩-沃尔默猝灭分析显示，铁的检测限低至7.3×10⁻⁸ mol L⁻¹，线性响应范围为5×10⁻⁸至1×10⁻⁵ mol L⁻¹。本研究还分析了在Tb@Sr-BDC中由铁引起荧光猝灭的潜在机制。这些结果强调了Tb@Sr-BDC作为一种高效荧光探针在环境监测和生物医学传感应用中的潜力。
