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Method for preparing graphene quantum dot stabilized silver-rhodium bimetallic nanoparticles and application of nanoparticles

A graphene quantum dot, bimetallic nanotechnology, which is applied in the preparation of organic compounds, chemical instruments and methods, preparation of amino hydroxyl compounds, etc. The effect of suppressing self-agglomeration and saving costs

Inactive Publication Date: 2019-07-30
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This characteristic limits the potential applications of silver-rhodium bimetallic systems

Method used

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  • Method for preparing graphene quantum dot stabilized silver-rhodium bimetallic nanoparticles and application of nanoparticles
  • Method for preparing graphene quantum dot stabilized silver-rhodium bimetallic nanoparticles and application of nanoparticles
  • Method for preparing graphene quantum dot stabilized silver-rhodium bimetallic nanoparticles and application of nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Step 1: Take 1ml of graphene quantum dot solution, add it to the reagent bottle, and stir for 5 minutes.

[0055] Step 2: Add 2ml of deionized water and stir for 5 minutes.

[0056] Step 3: add 1ml sodium borohydride solution, the amount of added sodium borohydride substance is 20 times of the sum of the amount of silver nitrate and rhodium nitrate mixed solution substances added in step 4. The rate of addition is 1-5 minutes per milliliter.

[0057] Step 4: add 1ml silver nitrate and rhodium nitrate mixed aqueous solution, the amount summation of added silver nitrate and rhodium nitrate mixed aqueous solution substance is 2.5 * 10 -4 mmol, the ratio of silver nitrate and rhodium nitrate is 1:1, the volume ratio is 1:1, and the dropping speed is 1-5 minutes per milliliter. Then stir for 2-3 hours. Graphene-stabilized silver-rhodium bimetallic nanoparticles were prepared. Take a sample to make a characteristic electron microscope scanning picture.

[0058] figure 1...

Embodiment 2

[0060] The application of the novel graphene quantum dot-stabilized silver-rhodium bimetallic nanoparticle catalyst obtained in Example 1 of the present invention in catalytic degradation of p-nitrophenol and sodium borohydride reaction.

[0061] The reduction of p-nitrophenol catalyzed by silver-rhodium bimetallic nanoparticles proceeds according to a leaching mechanism, i.e. not on the surface of the nanoparticles but in small clusters of silver-rhodium bimetallic atoms or separated from the parent silver-rhodium bimetallic nanoparticles superior. In the first step, sodium borohydride is decomposed by hydrolysis to generate B(OH) 4 - and active hydrogen, and then the active hydrogen is transferred to the silver-rhodium bimetallic nanometer and adsorbed on the surface of the silver-rhodium bimetallic nanometer; finally, the active hydrogen on the surface of the silver-rhodium bimetallic nanometer reacts with p-nitrophenol to generate p-aminophenol.

[0062] The silver-rhodi...

Embodiment 3

[0071] Application of the novel graphene quantum dot-stabilized silver-rhodium bimetallic nanoparticle catalyst obtained in Example 1 of the present invention in catalytic degradation of 2,4-dinitrophenol and sodium borohydride.

[0072] The reduction of 2,4-dinitrophenol catalyzed by silver-rhodium bimetallic nanoparticles proceeds according to a leaching mechanism, i.e. not at the surface of the nanoparticles but at the silver-rhodium bimetallic atoms or separated from the parent silver-rhodium bimetallic nanoparticles on small clusters. In the first step, sodium borohydride is decomposed by hydrolysis to generate B(OH) 4 - and active hydrogen, and then the active hydrogen is transferred to the silver-rhodium bimetallic nanometer, adsorbed on the surface of the silver-rhodium bimetallic nanometer; finally, the active hydrogen on the surface of the silver-rhodium bimetallic nanometer reacts with 2,4-dinitrophenol to generate 2,4 - Diaminophenol.

[0073]

[0074] The st...

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Abstract

The invention provides a novel method for preparing silver-rhodium nanoparticles and belongs to the technical field of nano synthesis methods. Graphene quantum dots are utilized to prepare the silver-rhodium bimetallic nanoparticles, the operation is simple, reaction conditions are mild, and the prepared bimetallic nanoparticles are very stable, small in particle size and good in monodispersity performance, wherein the particles size of the nanoparticles is just a few nanometers. The prepared silver-rhodium bimetallic nanoparticles have better catalytic performance than silver nanoparticles and rhodium nanoparticles. The stable bimetallic nanoparticles are prepared by using an aqueous solution of the graphene quantum dots first and then adding a sodium borohydride aqueous solution and a mixed aqueous solution of silver nitrate and rhodium nitrate. The prepared bimetallic nanoparticles are dispersed in a clear and transparent solution.

Description

technical field [0001] The invention relates to a preparation method and application of novel silver-rhodium bimetallic nanoparticles, belonging to the field of functional materials. Background technique [0002] Due to their unique properties, such as quantum size effect, surface effect, interface effect, volume effect, small size effect, macroscopic quantum tunneling effect, etc., nanoparticles have attracted extensive attention in the field of materials and catalysis. An important basis for the research and application of material properties. [0003] Graphene quantum dots, as a new member of the graphene family, are a new type of carbon fluorescent nanomaterial with a lateral size of less than 100nm and graphene fragments of less than 10 layers. And the sideband effect is more obvious, which also makes graphene quantum dots have more emerging chemical and physical properties. At the same time, graphene quantum dots also have good solubility and chemical inertness, cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50C07C213/02C07C215/76C07C215/80C07C245/20
CPCB01J23/50C07C213/02C07C245/20B01J35/393B01J35/23C07C215/76C07C215/80
Inventor 刘湘李宁申佳露黄煜刘根江
Owner CHINA THREE GORGES UNIV
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