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Tremella-shaped carbon-coated nano-silver material as well as preparation method and application thereof

A carbon-coated and nano-silver technology is applied in the field of tremella-shaped carbon-coated nano-silver materials and the preparation thereof, which can solve the problems that a specific composite structure is difficult to realize, and achieve the effects of large specific surface area and high porosity.

Pending Publication Date: 2022-05-13
XIJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the early days, the preparation methods of silver-carbon composite materials mainly included high-temperature pyrolysis, chemical vapor deposition, etc. These methods are obviously not easy to realize for the design of specific composite structures.

Method used

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  • Tremella-shaped carbon-coated nano-silver material as well as preparation method and application thereof
  • Tremella-shaped carbon-coated nano-silver material as well as preparation method and application thereof
  • Tremella-shaped carbon-coated nano-silver material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A tremella-shaped carbon-coated nano-silver material, the preparation method of which is as follows:

[0035] Under light-shielding conditions, add 20 mL of silver nitrate solution with a concentration of 0.01 mol / L into 20 mL of sucrose solution with a concentration of 0.5 mol / L while stirring, and add 5 mL of trioctylamine dropwise while stirring in the above-mentioned mixed solution, Put it into an ultrasonic cleaner for ultrasonic dispersion for 15 minutes to form a milky white solution. Wherein, the molar ratio of sucrose to silver nitrate is 50:1.

[0036] Transfer the milky white solution above to a 50mL stainless steel reaction kettle. The outer layer of the reaction kettle is stainless steel, and the inner layer is polytetrafluoroethylene. Hydrothermal reaction in the box for 18 hours, after cooling to room temperature, repeated alternate centrifugation with deionized water and absolute ethanol, and vacuum drying to obtain tremella-shaped carbon-coated nano-si...

Embodiment 2

[0039] A tremella-shaped carbon-coated nano-silver material, its preparation method is basically the same as that of Example 1, the difference is: the trioctylamine added dropwise is 3mL; in a stainless steel reactor, react in a blast drying oven at 150°C 18h.

[0040] Such as image 3Shown is the partial transmission electron microscope collection of tremella-shaped carbon-coated nano-silver material prepared in Example 2 of the present invention. It is clearly observed from the picture that the crystallinity and dispersibility of the nano-silver particles are good, and the shapes are mostly circular and six-dimensional. Polygonal, with a size of 100-300nm.

[0041] Such as Figure 4 Shown, for the tremella-shaped carbon-coated nano-silver material prepared in Example 2 of the present invention, the structural characterization Raman spectrum and its corresponding Gaussian fitting spectrum, at 1360cm -1 and 1580cm -1 There are two broad peaks nearby, 1360cm -1 The nearby ...

Embodiment 3

[0043] A tremella-shaped carbon-coated nano-silver material, its preparation method is basically the same as that of Example 1, the difference is that the concentration of the sucrose solution is 0.1mol / L, and the molar ratio of sucrose to silver nitrate is 10:1; Trioctylamine is 3 mL.

[0044] Such as Figure 5 As shown, it is the X-ray diffraction spectrum of the Tremella-shaped carbon-coated nano-silver material prepared in Example 3 of the present invention. It is clearly shown in the figure that there is an obvious wrapping peak at a 2θ value of about 24°, corresponding to the hydrothermal carbon of the material. There are four sharp diffraction peaks at 2θ values ​​of 38.14°, 44.32°, 64.48° and 77.45°, corresponding to (111), (200), (220) and (311) crystal planes of silver (Silver -3C, JCPDS #04-0783), demonstrating the presence of silver.

[0045] Such as Image 6 As shown, it is the scanning electron microscope collection of the Tremella-shaped carbon-coated nano-si...

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Abstract

The invention discloses a tremella-shaped carbon-coated nano-silver material and a preparation method and application thereof.The preparation method comprises the steps that under the dark condition, a silver nitrate solution with the concentration being 0.01 mol / L is added into a sucrose solution with the concentration being 0.1-0.5 mol / L, 3-5 mL of trioctylamine is dropwise added into the mixed solution, ultrasonic dispersion is conducted, and a milk white solution is formed; wherein the molar ratio of the cane sugar to the silver nitrate is (50-100): 1; and carrying out hydrothermal reaction on the milk white solution at 150-180 DEG C for 18 hours, and cooling to room temperature after drying to obtain the tremella-shaped carbon-coated nano-silver material. The tremella-shaped carbon-coated nano-silver material has the characteristics of low density, high void ratio, large specific surface area, uniform embedding of silver nanoparticles and the like, and has excellent application performance in the field of catalyzing selective oxidation of propylene to generate epoxypropane.

Description

technical field [0001] The invention relates to a carbon-coated nano-silver material, in particular to a tremella-shaped carbon-coated nano-silver material and a preparation method and application thereof. Background technique [0002] As an important inorganic functional material, carbon materials are favored for their good stability, high thermal stability, acid and alkali resistance, and excellent electrical and thermal conductivity. Among them, the hydrothermal carbon material prepared by the hydrothermal method is rich in oxygen-containing functional groups such as hydroxyl, carboxyl, carbonyl and ketone, which is conducive to its further processing, such as secondary operations such as loading and modification, and because of its preparation Wide range of sources of raw materials, high added value, used as catalyst carrier, high-density and high-strength carbon material, ultra-high specific surface area activated carbon and lithium-ion secondary battery negative electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50B01J35/10C07D301/10C07D303/04
CPCB01J23/50C07D301/10C07D303/04B01J35/61Y02P20/52
Inventor 刘姣任民杨宏伟高博
Owner XIJING UNIV
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