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A kind of fluorescent carbon quantum dot and its preparation method and application

A carbon quantum dot and fluorescence technology, applied in the field of carbon luminescent nanomaterials, can solve the problems of inconvenient and expensive sample pretreatment, and achieve the effects of mild reaction conditions, easy promotion, and simple and effective synthesis methods.

Active Publication Date: 2020-11-10
SHANXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these methods are inconvenient and require expensive equipment and complicated sample pretreatment

Method used

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  • A kind of fluorescent carbon quantum dot and its preparation method and application
  • A kind of fluorescent carbon quantum dot and its preparation method and application
  • A kind of fluorescent carbon quantum dot and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1: Dissolve 0.216 g of p-phenylenediamine and 500 μL of ammonia water (concentration: 25%) in 20 ml of water at room temperature, stir well, and sonicate to obtain a clear solution.

[0025] Step 2, transfer the solution to a 50mL hydrothermal reaction kettle.

[0026] Step 3: Put the hydrothermal kettle in an oven and react at 200°C for 8 hours to obtain a red solution.

[0027] Step 4, after filtering the insoluble matter, a light red solution is obtained. Through a 1000Da dialysis bag, dialyze in a glass container for at least 3 days to obtain a pure aqueous solution of carbon quantum dots.

[0028] Step 5, freeze-drying the aqueous solution of fluorescent carbon quantum dots to obtain fluorescent carbon quantum dots, the relative quantum yield (using quinine sulfate as a standard) is 13.2%.

[0029] Characterization and application see figure 1

Embodiment 2

[0031] Except that the ammonia water was 100 μL, other conditions were the same as in Example 1. Its relative quantum yield (based on quinine sulfate) is 10.1%.

Embodiment 3

[0033] Except that the ammonia water was 300 μL, other conditions were the same as in Example 1. Its relative quantum yield (based on quinine sulfate) is 9.88%.

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Abstract

The invention provides fluorescent carbon quantum dots and a preparation method and application thereof. The preparation method comprises the following steps: putting p-phenylenediamine and ammonia water into solvent water together, and reacting at 150-250 DEG C for 6-10 hours to synthesize green carbon dots. When the preparation method is used for preparing the carbon dots, a technology is simple, raw materials are wide in sources and low in price, a preparation condition requirement is low, and the quantum yield of the obtained carbon quantum dots is relatively high. The prepared carbon quantum dots can be applied to detection of Cr<6+> in water and TNP (2,4,6-trinitrophenol) in the environment, can also be applied to detection of AA (ascorbic acid) in food, a medicinal preparation and ahuman serum sample, and can also be applied to fluorescence imaging of live cells.

Description

technical field [0001] The invention relates to carbon luminescent nanomaterials, in particular to carbon quantum dots, in particular to a fluorescent carbon quantum dot and its preparation method and application. Background technique [0002] Over the past decades, industrial and other anthropogenic processes have been continuously releasing heavy metal ions into the environment, among which the chromium ion, Cr(VI), is more dangerous to public health than other valence states. Examples include Cr(0) and Cr(III) because of its high mobility and carcinogenicity. Therefore, the determination of Cr(VI) in environmental samples is of great significance, and many countries strictly control the concentration of Cr(VI) in drinking water at a lower micromolar level. In order to monitor the quality of drinking water and reduce the risk of industrial waste, analytical methods with high sensitivity and fast response are important to ensure the determination of Cr(VI) at low concentra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65B82Y40/00G01N21/64C01B32/15
CPCB82Y40/00C01B32/15C09K11/65G01N21/64
Inventor 孟雅婷焦媛高艺芳双少敏董川
Owner SHANXI UNIV