Photoluminescence turn-off based dual analytes (Hg2+ and Pb2+) sensor in aqueous medium using 3-marcaptoproponic acid protected Mn2+ doped ZnSe quantum dots

A biomass-derived Schiff base material composited with polylactic acid nanofiber membrane as selective fluorescent 'turn off/on' platform for Pb2+ quantitative detection and characterization

Herein, a biomass-derived compound Z1 is synthesized via 'one pot' method for detection Pb²⁺ using fluorescence and visual dual-mode in aqueous solution. Z1 shows good response to Pb²⁺ with a limit of detection (LOD) of 13.4 nM. Importantly, the coordination mode of Z1 with Pb²⁺ is further evaluated by UV-vis and NMR spectroscopy and a 1:1 stoichiometry is identified. Furthermore, Z1 can be applied to detection Pb²⁺ in practical samples with satisfactory recoveries in range of 96.0 %-112.0 % in real samples. Besides, Z1 is added into polylactic acid (PLA) solution and made as portable fluorescence nanofiber membrane for Pb²⁺ detection. Further, Z1 responds to Pb²⁺ with high selectivity and sensitivity and has been applied for tracking Pb²⁺ changes in soil samples, zebrafish, and plant tissues. These results indicated that Z1 had great application potential in accurate detection Pb²⁺.