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Phosphorus-doped graphene quantum dot and electrochemistry preparing method thereof

A graphene quantum dot, electrochemical technology, applied in the direction of electrolysis process, electrolysis components, etc., can solve the problems of uneven size of graphene quantum dots, a large amount of use of dangerous strong acid and strong oxidant, etc., to achieve good ability to scavenge free radicals, simple and low cost The effect of cost preparation method and preparation process convenience

Active Publication Date: 2016-08-17
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

The advantage of this method is that the output is large and the design is simple. The disadvantage is that a large number of dangerous strong acids and strong oxidants are used in the operation process, and the size of the prepared graphene quantum dots is often not uniform.
In the process of preparing doped graphene quantum dots, the hydrothermal method only relies on the oxidation potential of the strong oxidant to promote the breaking of old chemical bonds and the formation of new chemical bonds. However, the potential of strong oxidizing agents is often constant, and some bonds with strong energy cannot be broken. Therefore, this method can also be successfully prepared in the preparation of graphene quantum dots doped by elements with low doping difficulty, but it is powerless for some elements with high doping difficulty

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  • Phosphorus-doped graphene quantum dot and electrochemistry preparing method thereof
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[0023] Such as Figure 1-Figure 2 As shown, the present invention provides a phosphorus-doped graphene quantum dot and an electrochemical preparation method thereof. Using an electrochemical constant potential method, by controlling the voltage, selecting a suitable electrolyte, and electrolysis time to prepare a graphene quantum dot with a high doped phosphorus content. Dots, and the quantum dots have excellent ability to scavenge free radicals, which is a new idea and method for scavenging free radicals.

[0024] The core of preparing phosphorus-doped graphene quantum dots by constant potential electrochemical method is to select a suitable electrolyte. This electrolyte must be a phosphorus-containing, water-soluble macromolecular organic compound, and it is non-toxic and easy to prepare. No toxic substances are produced in the process, so we chose sodium phytate, which is a green food additive, see molecular structure figure 1, in the sodium phytate molecule, the phosphoru...

Embodiment 1

[0027] A sodium phytate solution (NaP) with a concentration of 0.1mol / L was prepared, and a high-purity graphite rod and a platinum sheet electrode were inserted into the solution as the working electrode and the counter electrode. The constant potential was set to 5V, and the sweep time was set to 12h. The brown aqueous solution obtained from this solution was filtered with a 220nm filter head, and then dialyzed with a dialysis bag with a molecular weight cut-off of 3500-14000Da to remove excess ions, and the obtained light brown solution was designated as sample 1. Afterwards, the same concentration of phosphate buffered saline (PBS) was configured, and the control was the same as the above-mentioned condition parameters, except that the electrolyte was changed, and the quantum dots prepared by this method were counted as sample 2.

[0028] The GQDs aqueous solutions prepared above were respectively drip-coated on the surface of a clean silicon wafer of 0.5 × 0.5 cm. The inf...

Embodiment 2

[0030] A sodium phytate (NaP) solution with a concentration of 0.1mol / L was prepared, a high-purity graphite rod and a platinum sheet electrode were inserted as the working electrode and the counter electrode, and the electrochemical constant potential method was used for scanning. The scanning voltage was set to 3V, and the scanning time was 12h. Then the obtained brown aqueous solution was filtered with a 220nm filter head, and then dialyzed with a dialysis bag with a molecular weight cut-off of 3500-14000Da to remove excess ions.

[0031] Take the above-prepared GQDs aqueous solution, drop-coat it on the surface of a 0.5×0.5 cm clean silicon wafer, test whether it is successfully doped with phosphorus by infrared spectroscopy and X-ray photoelectron spectroscopy, and then conduct free radical scavenging experiments by ESR spectroscopy. Tested to see if it has high free radical scavenging capacity.

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Abstract

The invention provides a phosphorus-doped graphene quantum dot and an electrochemistry preparing method thereof. According to the preparing method, phosphorus-contained macromolecular organic compounds soluble in water are selected to serve as electrolytes, through controlled potential electrolyzing, phosphorus oxygen bonds are broken, phosphorus atoms are separated from the macromolecular organic compounds to enter the interior of the graphene quantum dot, carbon phosphorus bonds and the phosphorus oxygen bonds are formed, doping is completed, and the phosphorus-doped graphene quantum dot with the higher doping concentration content is prepared; the quantum dot has the good cleaning-up effect on hydroxyl radicals, and through ESR energy spectrum test, the clearing-up rate of the hydroxyl radicals can reach 78.49%; the method is easy and convenient in the operation process, the whole preparing process is conveniently planed as a whole, strong oxidizing acid or strong reducing agents are not used, and certain commercial feasibility is achieved; and graphene precursor which is rich in reserving and friendly to environment is adopted to replace expensive materials of graphite oxide, carbon nano-tubes and the like, and the method is hopefully and widely applied in the biomedical field.

Description

technical field [0001] The invention belongs to the field of free radical scavenging, and in particular relates to a phosphorus-doped graphene quantum dot and an electrochemical preparation method thereof. Background technique [0002] Free radicals, also known as "free radicals" in chemistry, refer to atoms or groups with unpaired electrons formed by the breaking of covalent bonds in the molecules of compounds under external conditions such as light and heat. In the metabolic reaction of the human body, an appropriate amount of free radicals can transmit energy and kill harmful bacteria, but when the free radicals are excessive, they will interfere with the normal operation of cells, accelerate cell aging, and cause various diseases. In today's society, with the development of industry, the pollution of the environment, the increase in the pressure of life and other reasons, people have more and more opportunities to be exposed to free radicals, such as inferior cosmetics, ...

Claims

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Application Information

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IPC IPC(8): C25B1/00
CPCC25B1/00
Inventor 李妍李森刘会刘新倩王力锋
Owner UNIV OF SCI & TECH BEIJING
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