A Fluorescent Probe for Detecting the Iodide Ion in Aqueous Solution

doi:10.7517/issn.1674-0475.201006

Abstract

Abstract: In this paper, anhydrous citric acid and N-(β-aminoethyl-γ-aminopropyl) methyldimethoxysilane were used to prepare carbon quantum dots by hydrothermal method. The carbon quantum dot emits blue light, and the excitation wavelength and emission wavelength were 370 nm and 466 nm, respectively. Due to the heavy atom effect of iodine and the ability of iodine ions to easily donate electrons, fluorescence quenching occurs when carbon quantum dots encounter iodide ions in an aqueous solution. By measuring the fluorescence lifetime, it was found that there was a dynamic quenching effect between carbon quantum dots and iodide ions. Using this feature, a fluorescent probe for selective detection of iodide ions in aqueous solution was established. Optimize the influence of the dispersion solvent on the fluorescence intensity of carbon quantum dots, and the influence of response time and pH on the quenching efficiency. Under the optimal experimental conditions:the fluorescence change value (F₀-F) with the logarithm of iodide ion concentration was linear, the linear equation was Y=427.60X+646.88, R²=0.9945, and the linear range was 5×10^-7-5×10^-4 mol/L, the detection limit was 3.2×10^-8 mol/L. The recovery range was 101%-105% when three concentrations spiked were used to test the water samples.

Key words: carbon quantum dots, iodine ion, heavy atom effect, dynamic quenching effect, fluorescent probe

LIU Luying, FAN Yuandong, WANG Jing, WANG Jingshan, XIE Haoyuan, XIE Lijun. A Fluorescent Probe for Detecting the Iodide Ion in Aqueous Solution[J]. IMAGING SCIENCE AND PHOTOCHEMISTRY, 2021, 39(3): 354-358.

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