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Biomass-based fluorescent carbon quantum dot, preparation method and applications thereof

A technology of carbon quantum dots and carbon-based quantum dots, which is applied in the field of fluorescent carbon quantum dots, can solve the problems of high price, natural environment and human health hazards, toxicity, etc., and achieve the effects of low cost, high sensitivity and high dispersion

Inactive Publication Date: 2019-09-03
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most organic molecules are still expensive and at the same time somewhat toxic, causing hazards to the natural environment and human health

Method used

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  • Biomass-based fluorescent carbon quantum dot, preparation method and applications thereof
  • Biomass-based fluorescent carbon quantum dot, preparation method and applications thereof
  • Biomass-based fluorescent carbon quantum dot, preparation method and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Preparation of Biomass-Based Carbon Quantum Dots

[0032] 0.05 g of starch was uniformly dispersed in 10 mL of aqueous solution under ultrasonic conditions, and then 600 μL of hydrazine hydrate solution was added to the solution, and the solution was ultrasonically dispersed for 5 minutes. Then transfer the homogeneous solution dispersed by ultrasonic in the previous step to a 25 mL polytetrafluoroethylene autoclave, at 80 o C temperature for 6 h. After cooling, take it out, filter it with a 220 nm filter membrane, transfer the filtered solution to a dialysis bag for dialysis, and finally obtain a biomass-based carbon quantum dot solution. the solution at 100 o C under drying, finally obtain black carbon quantum dot powder.

Embodiment 2

[0034] Preparation of Biomass-Based Carbon Quantum Dots

[0035] 1 g of lignin was uniformly dispersed in 100 mL of aqueous solution under ultrasonic conditions, and then 6000 μL of 0.1M sodium carbonate aqueous solution was added to the solution. The solution was dispersed by sonication for an additional 10 minutes. Then the homogeneous solution of ultrasonic dispersion in the previous step is transferred to a 500mL polytetrafluoroethylene autoclave, at 230 o C temperature for 24 h. After cooling, take it out, filter it with a 220 nm filter membrane, transfer the filtered solution to a dialysis bag for dialysis, and finally obtain a biomass carbon quantum dot solution. the solution at 80 o C under drying, finally obtain black carbon quantum dot powder.

Embodiment 3

[0037] A method utilizing biomass-based carbon quantum dots to detect silver ion concentration in solution, comprising the following steps:

[0038] The method for detecting silver ions using the biomass-based carbon quantum dot fluorescent probe material prepared in Example 1 uses a solution containing a carbon quantum dot concentration of 0.05 mg / mL containing the biomass-based carbon quantum dot fluorescent probe material. A series of 0~500 μmol . L -1 The ion solution to be tested for silver ion concentration is used as a parallel sample group, and 2 mL of carbon quantum dot solution with a concentration of 0.05 mg / mL is used as the experimental reagent, and each sample of the silver ion solution to be tested is added to the above-mentioned different carbon quantum dot solutions , to obtain the corresponding sample of the silver ion solution to be tested—the mixed solution of carbon quantum dot fluorescent probes, use an oscillator to fully shake the mixed solution for 10...

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Abstract

The invention discloses a biomass-based fluorescent carbon quantum dot, a preparation method and applications thereof. According to the present invention, the biomass-based fluorescent carbon quantumdot is prepared by using an environmentally-friendly biomass material as a raw material through a simple one-step hydrothermal method, has excellent fluorescence performance, has highly-sensitive fluorescent probe effect on silver ions, and can accurately detect the silver ion content in solutions, wherein the correlation coefficient between the silver ion concentration and the fluorescence intensity of the carbon quantum dot mixed solution can reach 0.992.

Description

technical field [0001] The invention belongs to the technical field of nano fluorescent material detection, and specifically relates to the preparation of a fluorescent carbon quantum dot, its preparation method and application. Background technique [0002] Silver is a precious metal and an important environmental element. However, the excessive use of silver-containing compounds will undoubtedly pollute the environment and endanger human health. At present, the methods for determining silver content mainly include: thiocyanate titration, atomic absorption spectrometry, sodium chloride precipitation and inductively coupled plasma spectrometry. These methods have disadvantages such as poor accuracy and complicated practical operation. Therefore, it is of great significance and economic value to develop a simple and sensitive silver ion detection method. [0003] Carbon quantum dots are a new type of carbon-based zero-dimensional material, which are widely used in medical i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y40/00C09K11/65G01N21/643
Inventor 王亮刘一健陈佳温时凯乐梦颖李伟涛
Owner SHANGHAI UNIV
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