Coal tar pitch based carbon quantum dot green preparation and Fe<3+> detection method

Abstract

The invention belongs to the field of preparation of nanomaterials, and discloses a coal tar pitch based carbon quantum dot green preparation and Fe<3+> detection method. The method comprises the following steps: placing coal tar pitch in deionized water, and carrying out ball milling and ultrasonic dispersion treatment to obtain a carbon quantum dot dispersion, wherein a mass ratio of the coal tar pitch to the deionized water is 1:(30-50); and oxidizing the carbon quantum dot dispersion by O3 with the concentration of 0.5-3 L / min for 1-4 h, and carrying out high speed centrifuge and vacuum drying to obtain carbon quantum dot powder with the average particle size of 5 nm. The prepared carbon quantum dot has the advantages of cheap raw materials, simple method, greenness and no pollution, and is suitable for large-scale production. The prepared carbon quantum dot realizes high selective detection of Fe<3+>, a good linear relationship exists between the fluorescence intensity and the concentration of the Fe<3+> when the concentration is 0-13 [mu]M, the detection limit is 1 ppb, and high detection accuracy is realized.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation, and in particular relates to a green preparation method of coal tar pitch-based carbon quantum dots, and the coal tar pitch-based carbon quantum dots prepared by the method are prepared on Fe 3+ aspects of application. Background technique [0002] Carbon quantum dots have some unique properties. Due to the quantum size and quantum confinement effects, such as size and excitation wavelength dependence, low toxicity, low cytotoxicity, and chemical stability, etc., they are used in biological imaging, fluorescent probes, It plays an important role in solar cells and electrocatalysis. [0003] At present, there are many methods for synthesizing quantum dots, such as ultrasonic stripping, solvothermal method, electron beam candle burning, ruthenium-catalyzed fullerene cage opening method, etc. [0004] The synthesis method is complicated and the raw materials are expensive, such as fullerene...

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Problems solved by technology

[0004] The synthesis method is complicated and the raw materials are expensive, such as fullerene C60, graphite oxide, citric acid, biomass and other substances. The most important thing is to use concentrated nitric acid, concentrated sulfuric acid and other substances to make it unfriendly to the environment. Coal is used as a synthetic raw material, but concentrated sulfuric acid and concentrated nitric acid are still used as oxidation methods. Therefore, it is very important to develop a simple and suitable carbon source to prepare carbon quantum dots with good water solubility.

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