Uranine-Based Composites for Preparation of Inorganic Phosphate Fluorescent Probes
Li, Huihui, et al. Sensors and Actuators B: Chemical, 2019, 301, 127110.
Fluorescein disodium salt, also known as uranine, has a high quantum yield, which is beneficial to improving the detection sensitivity of inorganic phosphate (Pi). In addition, anionic uranium facilitates the loading of zeolite imidazolate framework-8 (ZIF-8), which is widely used in fluorescence sensing. Synthesis of uranine@ZIF-8 composite · 0.2 g Zn(NO3)2·6H2O was dissolved in 0.8 mL water (pH 8, adjusted by NaOH), and then the solution of 12 mg uranine in 4 mL water was added. · After the mixture was stirred at room temperature for 1 min, the solution of 2 g 2-methylimidazole in 8 mL water was added dropwise. · The mixture was stirred at room temperature for an additional 15 min, and then the obtained uranine@ZIF-8 were collected by centrifugation. · After washed with water/ethanol (1/1, v/v) for several times, uranine@ZIF-8 was dried under vacuum at 60 °C overnight.
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