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Nanoacicular nickel-coated graphite composite particles and its preparation method and application

A technology of nickel-coated graphite and composite particles, which is applied in the field of synthesis of nano-needle-shaped nickel-coated graphite composite particles for p-aminophenol and its preparation, can solve the problems of difficult recycling and small particle size, and achieve low cost, prevent agglomeration, and facilitate The effect of recycling

Active Publication Date: 2016-05-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the particle size of this catalyst is small, and there are problems such as not easy to recycle.

Method used

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  • Nanoacicular nickel-coated graphite composite particles and its preparation method and application
  • Nanoacicular nickel-coated graphite composite particles and its preparation method and application
  • Nanoacicular nickel-coated graphite composite particles and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Using 200mL of absolute ethanol as a solvent, add 10g of flake graphite particles into a 250mL Soxhlet extractor to reflux for 8h, filter and vacuum dry for later use. Put the cleaned and dried graphite particles into the nickel sulfate solution for adsorption for 12 hours, filter and dry for later use; then take the above graphite particles and put them in the ethanol solution of sodium borohydride to stand still, and after the graphite particles and the ethanol solution are layered, filter and dry for later use . Prepare another solution by taking 2.63g of nickel sulfate hexahydrate, 25.4g of potassium sodium tartrate tetrahydrate, 0.27g of sodium hydroxide, and 5.2mL of 85% hydrazine hydrate solution to prepare a 100mL solution; put 100mL of the solution into a three-necked flask and heat it to 90 °C, add 0.5 g of pre-treated graphite, and react for 0.5 h. Suction filtration, washed twice with deionized water, and dried completely in a vacuum oven to obtain image ...

Embodiment 2

[0039] Using 200mL of absolute ethanol as a solvent, add 10g of flake graphite particles into a 250mL Soxhlet extractor to reflux for 8h, filter and vacuum dry for later use. Put the cleaned and dried graphite particles into the nickel sulfate solution for adsorption for 12 hours, filter and dry for later use; then take the above graphite particles and put them in the ethanol solution of sodium borohydride to stand still, and after the graphite particles and the ethanol solution are layered, filter and dry for later use . Prepare another solution by taking 5.25g of nickel sulfate hexahydrate, 28.2g of potassium sodium tartrate tetrahydrate, 0.4g of sodium hydroxide, and 22mL of 85% hydrazine hydrate solution to prepare a 200mL solution; put 200mL of the solution into a three-necked flask and heat to 80°C , add 0.5g of pre-treated graphite, and react for 0.5h. Suction filtration, washed twice with deionized water, and dried completely in a vacuum oven to obtain image 3 Nano-...

Embodiment 3

[0042] Using 200mL of absolute ethanol as a solvent, add 10g of flake graphite particles into a 250mL Soxhlet extractor to reflux for 8h, filter and vacuum dry for later use. Put the cleaned and dried graphite particles into the nickel sulfate solution for adsorption for 12 hours, filter and dry for later use; then take the above graphite particles and put them in the ethanol solution of sodium borohydride to stand still, and after the graphite particles and the ethanol solution are layered, filter and dry for later use . Prepare another solution by taking 7.88g of nickel sulfate hexahydrate, 98.5g of potassium sodium tartrate tetrahydrate, 1.8g of sodium hydroxide, and 21mL of 85% hydrazine hydrate solution to prepare a 300mL solution; put 300mL of the solution into a three-necked flask and heat to 70°C , add 0.5g of pre-treated graphite, and react for 0.5h. Suction filtration, washed twice with deionized water, and dried completely in a vacuum oven to obtain Figure 4 Nano...

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Abstract

The invention relates to a nano needle-like nickel-coated graphite compound particle and a preparation method and application thereof. The nano needle-like nickel-coated graphite compound particle is a nano needle-like nickel-coated flake graphite particle. The preparation method comprises the steps: processing the flake graphite particle, putting in a chemical nickel-plating solution, stirring while reacting, performing suction filtration, washing and drying to obtain the nano needle-like nickel-coated graphite compound particle. Compared with the prior art, the nano needle-like nickel-coated graphite compound particle has the main advantages that the activity of a catalyst prepared by adopting the preparation method is relatively high, for example, the reaction rate constant (k) for catalyzing reduction paranitrophenol by NaBH4 is 8.61*10<-2>min<-1>, and is greater than the k value (the rate constant is 14.82*10<-3>min<-1>) of a graphene oxide / nickel nano composite prepared by Ji and others and used for catalyzing the reaction. The nano needle-like nickel-coated graphite compound particle prepared by adopting the preparation method is magnetic, and is conveniently recycled. The preparation method disclosed by the invention is simple, low in cost and convenient to popularize and apply.

Description

technical field [0001] The invention relates to the technical field of composite materials and catalysis, in particular to a nano needle-shaped nickel-coated graphite composite particle for synthesizing p-aminophenol and its preparation method and application. Background technique [0002] P-aminophenol (PAP) is an important medicine, dyestuff and organic synthesis intermediate, and it can also be used to manufacture various dyes, dyeing agents, rubber antioxidants, photographic developers, pesticide antioxidants and oil additives. At present, the synthesis methods of p-aminophenol mainly include p-nitrophenol iron powder reduction method, nitrobenzene method and p-nitrophenol catalytic hydrogenation method. Among them, the catalytic hydrogenation reduction method of p-nitrophenol has the advantages of simple operation, high product yield and good quality, so it is widely used. In the process of synthesizing p-aminophenol by the catalytic hydrogenation reduction method of p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J32/00B82Y30/00B82Y40/00C07C215/76C07C213/00
Inventor 官建国兰芳王一龙赵素玲刘丽君凌轩
Owner WUHAN UNIV OF TECH
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