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A preparation method and application of chlorine-doped graphene quantum dots

A graphene quantum dot, chlorine doping technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, luminescent materials, etc. The effect of enhanced capacity, simple preparation method and low cost

Active Publication Date: 2020-07-31
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only oxygen-doped graphene quantum dots have limited ability to scavenge and generate active oxygen radicals. By doping chlorine atoms with higher electronegativity, we can change the electron density distribution in graphene quantum dots to a greater extent. And by changing the content of oxygen-containing functional groups in graphene quantum dots, the influence of chlorine atom doping and the type of oxygen-containing functional groups on the ability of graphene quantum dots to generate active oxygen free radicals was explored.

Method used

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  • A preparation method and application of chlorine-doped graphene quantum dots
  • A preparation method and application of chlorine-doped graphene quantum dots
  • A preparation method and application of chlorine-doped graphene quantum dots

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0032] Weigh 1g of sucralose, add it to a 10ml beaker, add 10ml of sodium hydroxide (4M), use two platinum wire electrodes, one of which is the working electrode, and the other is the counter electrode and the reference electrode. ChemStation, applied 5-10v voltage, electropolymerization for 45min-4h, the obtained solution was dialyzed with 0.22μm dialysis bag (3500Da) for 3 days, after removing the electrolyte in the solution, an aqueous solution of chlorine-doped graphene quantum dots was obtained.

[0033] The prepared chlorine-doped graphene quantum dots were tested as follows:

[0034] Characterization of transmission electron microscopy and high resolution transmission electron microscopy, from figure 2 It can be seen that the prepared chlorine-doped graphene quantum dots have lattice stripes of graphite quantum dots. Take the GQDs aqueous solutions prepared above and drop them onto the surface of a clean silicon wafer of 0.5×0.5cm. Tests of infrared spectroscopy and X-ray p...

Embodiment approach 2

[0036] Weigh 1g of sucralose, add it to a 10ml beaker, add 10ml of sodium hydroxide (4M), use two platinum wire electrodes, one of which is the working electrode, and the other is the counter electrode and the reference electrode. ChemStation, applied 7.5v voltage, electropolymerization for 45min, the solution obtained was dialyzed with 0.22μm dialysis bag (3500Da) for 3 days, after removing the electrolyte in the solution, an aqueous solution of chlorine-doped graphene quantum dots was obtained.

[0037] Antioxidant performance test: 2mL solution contains 100μg / mL quantum dots, 50μg / mL TiO 2 , 25mM PBS and 10μM rhodan name B (RhB). Under the condition of magnetic stirring, after 3h of ultraviolet light, the characteristic absorption peak (554nm) of RhB was used to determine the concentration of RhB by absorption spectrum. Graphene quantum dots were not included in the comparative experiment. Under ultraviolet light, TiO 2 Active oxygen free radicals will be generated to decompo...

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Abstract

The invention discloses a preparation method and application of a chlorine-doped graphene quantum dot, and belongs to the technical field of a preparation technology of inorganic materials. Accordingto the method, the chlorine-doped graphene quantum dot is formed by performing electrochemical polymerization on micromolecular sucralose. The variety of oxygen-containing functional groups in the chlorine-doped quantum dot can be adjusted through changing of voltage and time. The chlorine-doped graphene quantum dot can effectively scavenge active oxygen radicals, and shows excellent oxidation promoting performance. The method is simple, easy to operate, available in materials, and suitable for large-scale production, and has a wide application prospect in the field of radicals scavenging (such as intracellular oxidation resistance and fuel protection) and the field of radicals producing (such as photodynamic therapy and sterilization).

Description

Technical field [0001] The invention relates to a preparation method and application of chlorine-doped graphene quantum dots. The prepared quantum dot has excellent oxidation resistance and oxidation promotion performance, and belongs to the technical field of inorganic material preparation technology. Background technique [0002] Active oxygen free radicals refer to chemically active free radicals derived from oxygen molecules and some molecules, including singlet oxygen, hydrogen peroxide, superoxide free radicals and hydroxyl free radicals. Active oxygen free radicals play an important role in food preservation, cosmetics, metal antiseptic, polymer materials, biomedicine, and structural damage in organisms (cell membranes, proteins, DNA, etc.). [0003] Many studies have shown that carbon nanomaterials have the ability to scavenge active oxygen radicals, such as carbon nanotubes, fullerene derivatives, graphene derivatives and so on. Carbon nanomaterials have the function of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/00C09K11/65B82Y20/00B82Y30/00B82Y40/00
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/65
Inventor 李妍王力锋李森孔文慧王应敏
Owner UNIV OF SCI & TECH BEIJING
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