Terbium alginate encapsulated CsPbI 3 @Pb-MOF: a ratiometric fluorescent bead for detection and adsorption of Fe 3

• Published in: Dalton transactions : an international journal of inorganic chemistry 2024-02, Vol.53 (6), p.2541-2550
• Main Authors: Hou, Yangwen, Feng, Hua, He, Jingting, Meng, Fanfei, Sun, Jing, Li, Xiao, Wang, Xinlong, Su, Zhongmin, Sun, Chunyi
• Format: Article
• Language: English
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/D3DT04187E

Halide perovskite nanocrystals are innovative luminescent materials for fluorescent probes with high quantum yield and narrow emission bandwidth. However, the limited stability, single-signal response, and separation challenges obstruct their widespread use in water ion detection. Herein, a ratiometric fluorescence sensor based on terbium alginate gel beads (green fluorescent, namely Tb-AG) embedded with powdered CsPbI @Pb-MOF (red fluorescent) was prepared for fluorescent determination and adsorption of Fe . Pb-MOF's protection notably enhances the water stability of CsPbI , while the energy transfer between CsPbI @Pb-MOF and Tb elevates the optical performance of CsPbI @Pb-MOF@Tb-AG. Significantly, Fe markedly suppresses CsPbI @Pb-MOF red fluorescence at 647 nm, while not noticeably affecting Tb-AG green emission at 528 nm. The sensor exhibited a strong linear response to Fe concentrations ranging from 0 to 90 μM, with a detection limit of 0.44 μM and high selectivity. The CsPbI @Pb-MOF@Tb-AG-based sensor has been effectively validated through its successful use in detecting Fe in tap and river water samples. Furthermore, CsPbI @Pb-MOF@Tb-AG demonstrates a notable adsorption capacity of 325.4 mg g Fe . Finally, the mechanism of Fe detection and adsorption was determined.