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Preparation method and application of carbon quantum dot-based fluorescence sensor with hexavalent chromium ion detection function

A hexavalent chromium ion, fluorescence sensor technology, applied in chemical instruments and methods, measurement devices, fluorescence/phosphorescence and other directions, can solve the problems of inability to realize visual fluorescence detection, low emission wavelength of fluorescent carbon quantum dots, etc. The effect of cheap raw materials and easy availability of raw materials

Inactive Publication Date: 2019-02-12
CHANGCHUN UNIV OF TECH
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Problems solved by technology

[0006] The present invention aims to solve the problem that the emission wavelength of fluorescent carbon quantum dots is low in the existing method for detecting heavy metals by using fluorescent carbon quantum dots, and the problem that visual fluorescence detection cannot be realized, and provides a carbon quantum dot base with hexavalent chromium ion detection function. Preparation method and application of fluorescent sensor

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  • Preparation method and application of carbon quantum dot-based fluorescence sensor with hexavalent chromium ion detection function
  • Preparation method and application of carbon quantum dot-based fluorescence sensor with hexavalent chromium ion detection function
  • Preparation method and application of carbon quantum dot-based fluorescence sensor with hexavalent chromium ion detection function

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specific Embodiment approach 1

[0035] Specific embodiment one: the preparation method of the carbon quantum dot-based fluorescent sensor with hexavalent chromium ion detection function in this embodiment, comprises the following steps:

[0036] 1. Dissolve the carbon source in N,N-dimethylformamide, and perform ultrasonic treatment to form a uniform mixed solution A; wherein the molar ratio of the carbon source and N,N-dimethylformamide in step 1 is 1: (50~130);

[0037] 2. Pour the solution A obtained in step 1 into a reactor lined with polytetrafluoroethylene, and put the reactor into an oven to react to obtain solution B;

[0038] 3. Put the solution B obtained in step 2 into a centrifuge tube, centrifuge repeatedly for 3-5 times, remove the large solid at the bottom, and keep the supernatant;

[0039] 4. Dialyze the supernatant obtained in step 3 for 48 hours with a dialysis bag, further purify the carbon quantum dot solution, remove uncarbonized reaction monomers, and obtain a carbon quantum dot solut...

specific Embodiment approach 2

[0041] Embodiment 2: This embodiment differs from Embodiment 1 in that: the carbon source in Step 1 is ethylenediaminetetraacetic acid, sodium citrate or ascorbic acid. Others are the same as in the first embodiment.

[0042] These several carbon sources can be dissolved with N,N-dimethylformamide to form a uniform mixed solution, which is helpful to further generate orange fluorescent carbon quantum dots with uniform size, stability and excellent fluorescence performance.

specific Embodiment approach 3

[0043] Embodiment 3: This embodiment is different from Embodiment 1 or 2 in that: in step 1, the power of ultrasonic treatment is 60-80W, and the time of ultrasonic treatment is 10-30min. Others are the same as in the first or second embodiment.

[0044]Selecting the appropriate ultrasonic power is conducive to the rapid dissolution of the carbon source without destroying the molecular structure of the selected carbon source. Ultrasonication for 10-30 minutes can ensure that the carbon source is completely dissolved in N,N-dimethylformamide, which is conducive to the preparation of orange fluorescent carbon quantum dots with uniform size, stability and excellent fluorescence performance.

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Abstract

The invention discloses a preparation method and application of a carbon quantum dot-based fluorescence sensor with a hexavalent chromium ion detection function, relates to the preparation method andthe application of the carbon quantum dot-based fluorescence sensor and aims at solving the problems that fluorescence carbon quantum dots in an existing method of utilizing fluorescence carbon quantum dots to detect heavy metal has lower emission wavelength and visual fluorescence detection cannot be achieved. The method comprises the steps: 1, dissolving a carbon source into N,N-dimethyl formamide and performing ultrasonic treatment to form an even mixed solution A; 2, pouring the solution A into a reaction kettle and reacting to obtain a solution B; 3, putting the solution B into a centrifugal tube, centrifuging repeatedly and keeping liquid supernatant; 4, dialyzing the liquid supernatant with a dialysis bag to obtain a carbon quantum dot solution, namely the carbon quantum dot-based fluorescence sensor. The emission wavelength of the fluorescence carbon quantum dots prepared by the preparation method can reach 530 to 550 nm, and visual fluorescence detection on heavy metal ions can be achieved. The carbon quantum dot-based fluorescence sensor disclosed by the invention is applied to the field of heavy metal detection.

Description

technical field [0001] The invention relates to a preparation method and application of a carbon quantum dot-based fluorescence sensor. Background technique [0002] The environmental problem has become a long-term problem in history. Human life and economic and social development are directly affected by the environment. It is a major issue of widespread concern in today's society, and its importance goes without saying. Today's environmental problems have become a major problem restricting my country's economic and social development. The rapid development of the world economy and urbanization has caused a sharp increase in low-concentration toxic pollutants around the world, causing harm to humans and ecosystems. Common pollutants in the environment include organic pollutants, heavy metal pollutants, and microorganisms. The environmental pollution in my country has shown the characteristics of trace organic pollution. Therefore, it is very important to carry out effectiv...

Claims

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Application Information

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IPC IPC(8): C09K11/65G01N21/64
CPCC09K11/65G01N21/643G01N2021/6432
Inventor 何雯雯孙明亮杨旭东关爽张家裕
Owner CHANGCHUN UNIV OF TECH
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