RCDs-Fe(III)复合荧光碳点的 合成及检测氟离子的应用.

The citric acid, ethylenediamine, salicylic acid and Fe(III) were used as raw materials to synthesize a composite fluorescent carbon dot (RCDs-Fe(III)) that specifically responds to fluoride ions. Subsequently, through a series of experiments, the conditions of carbon dot synthesis and fluoride ion detection were optimized. The optimal raw material ratio for carbon point synthesis is: 2 mL ethylenedia. mine, 2 g citric acid and 0. 2 g salicylic acid; the optimal detection conditions are: the reaction system solvent is a hydrochloric acid solution w让h pH 5. 0, thE Fe(III) concentration is 150 mg/L, the composite carbon dot concentration is 0.5%, and the carbon dot exc让ation and emission wavelengths are 370 nm and 460 nm, respectively. Under the optimal detection conditions, the linear range of fluoride ion detection by RCDs-Fe(III) is 1 〜25 mg/L, and the detection limit is 0. 82 mg/L. Finally, the composite carbon dots were used for the determination of fluoride ion in toothpaste, and the results were consistent with the comparison method. [ABSTRACT FROM AUTHOR]