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Preparation method and application of graphene quantum dots

A technology of graphene quantum dots and graphene powder, applied in chemical instruments and methods, measuring devices, fluorescence/phosphorescence, etc., can solve the problems of unfavorable preparation of graphene quantum dot probes, low sensitivity of the method, low luminous efficiency, etc. Achieve the effect of solving the cumbersome pre-treatment process, high sensitivity, and high luminous efficiency

Active Publication Date: 2017-06-20
TCL CORPORATION
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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of graphene quantum dots, aiming to solve the problem that the existing preparation method of graphene quantum dots requires large-scale equipment, and the purity is not high, and the luminous efficiency is low, which is not conducive to the preparation of graphene quantum dots probe problem
[0006] Another object of the present invention is to provide a quantitative detection method for phosphate, aiming to solve the problem that the existing phosphate detection method requires large instruments and the method has low sensitivity

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  • Preparation method and application of graphene quantum dots
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[0024] The embodiment of the present invention provides a kind of preparation method of graphene quantum dot, comprises the following steps:

[0025] S01. Provide graphene powder and mixed acid, mix the graphene powder with the mixed acid, and obtain a mixed solution containing a reaction intermediate through oxidation reaction, wherein the mixed acid is composed of concentrated sulfuric acid and auxiliary acid ;

[0026] S02. After the mixed solution is ultrasonically treated, it is placed in a heating container equipped with a waste gas recovery device for calcination treatment to obtain a crude product of graphene quantum dots;

[0027] S03. Dispersing the crude graphene quantum dot product in distilled water, followed by microporous membrane filtration and dialysis bag dialysis treatment to obtain graphene quantum dots.

[0028] Specifically, in the above step S01, the graphene powder is oxidized by the mixed acid to obtain a mixed solution containing a reaction intermedi...

Embodiment 1

[0057] A method for quantitative detection of phosphate, comprising the following steps:

[0058] Q11. Prepare green graphene quantum dot probes and configure green graphene quantum dot probe solutions;

[0059] Wherein, the preparation method of described green graphene quantum dot probe comprises the following steps:

[0060] Oxidize graphene powder and mixed acid at room temperature in a beaker at a ratio of 0.0125g / mL, where the mixed concentrated acid combination includes: concentrated sulfuric acid and concentrated nitric acid, concentrated sulfuric acid and dichromic acid, concentrated sulfuric acid and diphosphoric acid, concentrated sulfuric acid and hydroiodic acid, concentrated sulfuric acid and permanganic acid, concentrated sulfuric acid and hydrobromic acid, concentrated sulfuric acid and perchloric acid, concentrated sulfuric acid and concentrated hydrochloric acid; and the mixed volume ratio of concentrated sulfuric acid and other acids is 1:3, and the oxidatio...

Embodiment 2

[0067] A method for quantitative detection of phosphate, comprising the following steps:

[0068] Q21. Prepare red graphene quantum dot probes and configure red graphene quantum dot probe solutions;

[0069] Wherein, the preparation method of described red graphene quantum dot probe comprises the following steps:

[0070] Oxidize graphene powder and mixed acid at room temperature in a beaker at a ratio of 0.0125g / mL, where the mixed concentrated acid combination includes: concentrated sulfuric acid and concentrated nitric acid, concentrated sulfuric acid and dichromic acid, concentrated sulfuric acid and diphosphoric acid, concentrated sulfuric acid and hydroiodic acid, concentrated sulfuric acid and permanganic acid, concentrated sulfuric acid and hydrobromic acid, concentrated sulfuric acid and perchloric acid, concentrated sulfuric acid and concentrated hydrochloric acid; and the mixed volume ratio of concentrated sulfuric acid and other acids is 1:3, and the oxidation time...

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Abstract

The invention provides a preparation method of graphene quantum dots. The method comprises the following steps: providing graphene powder and an acid mixture, mixing the graphene powder and acid mixture, and carrying out oxidation reaction to obtain a reaction-intermediate-containing mixed solution, wherein the acid mixture is composed of concentrated sulfuric acid and auxiliary acids; carrying out ultrasonic treatment on the mixed solution, and carrying out calcination treatment in a heating container of a waste gas recovery device to obtain a graphene quantum dot crude product; and dispersing the graphene quantum dot crude product in distilled water, and sequentially carrying out microporous filter membrane filtration treatment and dialysis bag dialysis treatment to obtain the graphene quantum dots.

Description

technical field [0001] The invention belongs to the technical field of graphene quantum dots, in particular to a preparation method and application of graphene quantum dots. Background technique [0002] In recent years, graphene quantum dot materials have become an indispensable member of the "quantum dot family". Graphene quantum dot materials have attracted much attention due to their excellent thermochemical stability, good thermal conductivity, and super-strong electron mobility. In addition, they also have incomparable characteristics in biochemical properties: such as good Biocompatibility, low cytotoxicity. These superior properties make graphene quantum dot materials have broad application prospects in photovoltaics, bioimaging, sensors, and optical analysis and detection. [0003] Phosphate is an essential component in the nutritional chain of microorganisms in water, but excessive phosphate may cause irreparable damage to water bodies. Phosphate currently relea...

Claims

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Application Information

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IPC IPC(8): C09K11/65G01N21/64
CPCC09K11/65G01N21/64G01N2021/6421
Inventor 邓承雨杨一行钱磊刘政谢相伟
Owner TCL CORPORATION
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