Ag/C (Silver/Carbon) hollow nano-sphere and preparation method thereof
A technology of hollow spheres and nanospheres, applied in the field of catalysis, can solve problems such as instability, easy aggregation, and easy oxidation, and achieve the effects of solving aggregation, improving activity and stability, and avoiding aggregation and oxidation
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0018] Embodiment 1: In this embodiment, Ag / C nano hollow spheres are prepared by the hydrogen peroxide corrosion method, and the steps are as follows:
[0019] (1) Preparation of Ag / C nanospheres with core-shell structure by hydrothermal method: Dissolve 1 g of glucose in 20 ml of deionized water, add 0.5 ml of silver nitrate aqueous solution with a concentration of 0.1mol / L, disperse evenly, and transfer the solution to water In a thermal reaction kettle, hydrothermal reaction was carried out at 180°C for 4 hours; the reacted product was centrifuged to obtain Ag / C nanospheres with a core-shell structure; figure 1 A (SEM image) and 1B (TEM image) are shown. It can be clearly seen from the figure that the size of Ag / C nanospheres with core-shell structure is uniform, and the core-shell structure has good dispersion.
[0020] (2) Preparation of Ag / C hollow nanospheres: Disperse 50 mg of Ag / C nanospheres with a core-shell structure in 50 ml of deionized water, stir and disperse...
Embodiment 2
[0023] Example 2, this example studies the formation process of Ag / C nano hollow spheres.
[0024] h 2 o 2 It is a clean and efficient etchant, it can not only oxidize Ag to Ag + , and can also put Ag again + Reduction to smaller silver nanoparticles. In addition H 2 o 2 Generated O 2 Make the silver nanoparticles diffuse from inside to outside. Ag / C nanospheres with core-shell structure ( Figure 4 A) in H 2 o 2 The change process under the action of corrosion such as Figure 4 shown. After reacting for 10 minutes, the silver nucleus tended to be dissolved, and a small amount of dispersed silver nanoparticles with a particle size of about 10 nm formed in the carbon layer ( Figure 4 B). After 20 minutes of reaction, the silver core was partially dissolved, and a large number of silver nanoparticles were gradually formed in the carbon shell ( Figure 4 C). After 30 minutes of reaction, about half of the Ag core was dissolved, and a large number of smaller Ag nan...
Embodiment 3
[0025] Example 3, this example uses the Ag / C hollow nanospheres prepared in Example 1 for the catalytic hydrogenation of nitrophenol, specifically:
[0026]Steps: Prepare 0.5 M NaBH 4 (reducing agent, reduced p-nitrophenol) solution 2 ml and 0.01 M p-nitrophenol (4-NP) solution 1 ml. Sequentially add 200 μL of 0.5 M NaBH to a 50 ml beaker 4 Solution, 50 μL of 0.01 M p-nitrophenol (4-NP) solution and 20 ml of deionized water, after ultrasonic homogenization, take a sample for ultraviolet absorption test as a reference. Then 1.0 mg of Ag / C hollow nanospheres were added, under magnetic stirring at room temperature, samples were taken every 2-5 minutes, and UV absorption test was carried out after each sample was taken. Under the same conditions, the core-shell AgC microspheres were also tested for their catalytic performance as a reference.
[0027] like Figure 5 As shown in A, in NaBH 4 When no catalyst is added, there is a strong absorption peak at around 400 nm, which co...
PUM
Property | Measurement | Unit |
---|---|---|
thickness | aaaaa | aaaaa |
particle diameter | aaaaa | aaaaa |
particle diameter | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com