Carbon quantum dot for mercury ion fluorescence detection, preparation method and application

By employing a microwave synthesis method for N and B co-doped carbon quantum dots, the problems of high detection limit, narrow linear range, and matrix interference in traditional carbon quantum dots have been solved, achieving high sensitivity and rapid mercury ion detection, which is suitable for food and environmental detection.

CN122080928APending Publication Date: 2026-05-26HUANENG CHONGQING LUOWEN POWER CO LTD +1
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Patent Information

Application Number
CN202610145930.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-02
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

When existing carbon quantum dots are used for mercury ion detection, they have high detection limits, narrow linear ranges, are easily affected by sample matrix fluorescence, and have long synthesis cycles and complex processes, making it difficult to meet the requirements of high sensitivity and rapid detection.

Method used

Using 2,3-diaminopyridine and boric acid as raw materials, N and B co-doped carbon quantum dots were synthesized in one step via microwave method to prepare a fluorescent sensing system with specific recognition ability, avoiding matrix fluorescence interference, improving the detection signal-to-noise ratio, and simplifying the synthesis process.

Benefits of technology

It achieves a low detection limit (32.8 nmol/L), a wide linear range (0-25 μmol/L), high sensitivity, and strong anti-interference ability, making it suitable for trace detection of mercury ions in food and the environment. It also boasts high synthesis efficiency and low cost, making it suitable for multifunctional integration.

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Abstract

The invention relates to the technical field of fluorescence sensing and food safety detection, in particular to a carbon quantum dot for mercury ion fluorescence detection and a preparation method and application thereof.According to the method, 2, 3-diaminopyridine serves as a C source and an N source, boric acid serves as a boron source, and N and B synergistically doped carbon quantum dots are synthesized in one step through a microwave method; a fluorescence sensing system with specific recognition capability on Hg < 2 + > is constructed, compared with traditional blue light carbon quantum dots, the carbon quantum dot has the emission wavelength of 425-520 nm, belongs to a long wavelength region, has the linear range of 0-25 [mu] mol / L, and can meet the detection requirements of trace-to-trace Hg < 2 + >; the detection limit of mercury ions (Hg < 2 + >) is as low as 32.8 nmol / L, which is far lower than the allowable concentration of Hg < 2 + > in food specified in food safety standards, and the problems of low sensitivity and poor stability of Hg < 2 + > detection based on carbon quantum dots in the prior art are solved.
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