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Preparation method and application of fluorescent carbon quantum dots

A technology of carbon quantum dots and fluorescence, which is applied in the field of preparation of fluorescent carbon quantum dots, can solve the problems of poor recognition response sensitivity and anti-interference ability, complex reaction conditions, low yield of fluorescent carbon quantum dots, etc., and achieve excellent stability, The raw materials are cheap and easy to obtain, and the effect of uniform size

Active Publication Date: 2018-09-04
SHANXI UNIV
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Problems solved by technology

[0007] The present invention provides a method for preparing fluorescent carbon quantum dots and its application in order to solve the problems of low yield of fluorescent carbon quantum dots, poor recognition response sensitivity and anti-interference ability, complex reaction conditions, etc., and the obtained fluorescent carbon quantum dots Application of Quantum Dots in the Detection of Cr(VI) and Ascorbic Acid AA

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  • Preparation method and application of fluorescent carbon quantum dots
  • Preparation method and application of fluorescent carbon quantum dots
  • Preparation method and application of fluorescent carbon quantum dots

Examples

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Effect test

Embodiment 1

[0017] Example 1: Put corn in a micronizer to obtain cornmeal with a particle size of less than 1 mm. Weigh 0.25 g of cornmeal and 0.1 g of DETA, and add 1 mL of deionized water to dissolve it. Microwave heating for 20 min with a power of 700 W gave a light yellow solution. It was subjected to ultrasonic treatment, centrifuged to remove large particles of impurities, and dialyzed to remove unreacted small molecules to finally obtain an aqueous solution of carbon quantum dots, which was freeze-dried and stored.

[0018] The fluorescent carbon quantum dots were formulated into a 10 mg / mL aqueous solution, dropped on a copper grid with a carbon film, and tested after vacuum drying. The average particle size of the carbon quantum dot aqueous solution was measured to be 4 ± 0.5 nm, and the particle size distribution uniform, such as figure 1 shown. And measure its ultraviolet absorption spectrum and fluorescence excitation and emission spectrum, such as figure 2 As shown, the m...

Embodiment 2

[0021] Example 2: Put corn in a micronizer to obtain cornmeal with a particle size of less than 1 mm. Weigh 0.2 g of cornmeal and 0.2 g of DETA, and add 1 mL of deionized water to dissolve it. Microwave heating for 10 min at a power of 539 W gave a light yellow solution. It was subjected to ultrasonic treatment, centrifuged to remove large particles of impurities, and dialyzed to remove unreacted small molecules to obtain an aqueous solution of carbon quantum dots, which was freeze-dried and stored. The fluorescence emission peak of the carbon quantum dots is at 502 nm, showing strong green fluorescence, and the quantum yield is 15.2%.

Embodiment 3

[0022] Example 3: Put corn in a micronizer to obtain cornmeal with a particle size of less than 1 mm. Weigh 0.3 g of cornmeal and 0.5 g of DETA, and add 1 mL of deionized water to dissolve it. Microwave heating for 15 min with a power of 385 W gave a light yellow solution. It was subjected to ultrasonic treatment, centrifuged to remove large particles of impurities, and dialyzed to remove unreacted small molecules to obtain an aqueous solution of carbon quantum dots, which was freeze-dried and stored. The fluorescence emission peak of the carbon quantum dots is at 502 nm, showing strong green fluorescence, and the quantum yield is 12.5%.

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Abstract

The invention and belongs to the technical field of fluorescent nanomaterials, aims to solve the problems of relatively low yield of the current fluorescent carbon quantum dots, poor sensitivity of recognition response and anti-interference ability, a complicated reaction condition and the like, and provides a preparation method and application of fluorescent carbon quantum dots. With corn and dimethylene triamine DETA as raw materials, the fluorescent carbon quantum dots are synthesized in one step by a microwave heating method. The raw materials are cheap and easy to obtain; the carbon pointpreparation process method is simple and environmentally friendly; the fluorescent carbon quantum dots can be synthesized in large quantities; the fluorescent carbon quantum dots have small particlesizes of 3-5nm and uniform sizes, and can be stably dispersed in water, without an agglomeration phenomenon; the fluorescent carbon quantum dots have excellent fluorescence properties and relatively high fluorescent quantum yield; the fluorescent carbon quantum dots have excellent stability, and has stable performance under different ion concentrations, pH values and light irradiation time; the fluorescent carbon quantum dots have high selectivity, good reproducibility and high sensitivity during Cr (VI) and AA detection, and can quickly and accurately detect the contents of Cr (VI) and AA inliquid to be detected.

Description

technical field [0001] The invention belongs to the technical field of fluorescent nanometer materials, and in particular relates to a preparation method and application of fluorescent carbon quantum dots. Background technique [0002] Chromium (Cr) is an essential trace element for the human body. It is widely distributed in nature and mostly exists as Cr(III) and Cr(VI) in the environment. Its toxicity is related to its valence and concentration. Cr(III) is beneficial to the human body within a certain concentration range, but it can also cause harm to living organisms when its concentration is too high. Cr(VI) is an important environmental pollutant, and its toxicity is 100 times higher than that of Cr(III). At the same time, Cr(VI) is easily absorbed by the human body, which can irritate and burn mucous membranes and skin and cause ulcers. [0003] Ascorbic acid (AA), also known as vitamin C, is an indispensable vitamin for maintaining human health. Studies have found ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65G01N21/64B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/65G01N21/6428G01N2021/6432
Inventor 张彦高鹏飞双少敏张国梅董川
Owner SHANXI UNIV
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