Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Hollow bimetal nanoparticle/titanium dioxide core-shell structure, and preparation method and application thereof

A technology of metal nanoparticles and bimetallic nanometers, which is applied in the application field of photocatalytic degradation of organic matter, can solve the problems of easy aggregation of bimetallic nanoparticles and small contact area between bimetallic nanoparticles and titanium dioxide, and achieve better catalytic effect and conditions Mild, good degradation effect

Inactive Publication Date: 2015-04-08
UNIV OF JINAN
View PDF6 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the above-mentioned traditional loading method is also used to load bimetallic nanoparticles on the surface of titanium dioxide. This method still has the problems of easy aggregation of bimetallic nanoparticles and small contact area between bimetallic nanoparticles and titanium dioxide.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Hollow bimetal nanoparticle/titanium dioxide core-shell structure, and preparation method and application thereof
  • Hollow bimetal nanoparticle/titanium dioxide core-shell structure, and preparation method and application thereof
  • Hollow bimetal nanoparticle/titanium dioxide core-shell structure, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) Preparation steps of hollow bimetallic nanoparticles: Weigh 0.5g of polyvinylpyridine-polyethylene oxide block copolymer (PVP-b-PEO), add 0.12g of silver nitrate (where Ag / VP=0.6), add Solvent tetrahydrofuran was used to prepare a solution with a concentration of 0.05 wt% of the block copolymer, and stirred for 2 days to obtain a clear and transparent solution. On this basis, a certain amount of ultraviolet absorber 2,4-dihydroxybenzophenone (BPH) was added. Transfer the solution into a quartz bottle and irradiate it with ultraviolet light (254nm) for 10-20 hours to obtain a yellow silver nanoparticle solution; weigh 40g of the prepared silver nanoparticle solution, and add 1mg / mL HAuCl under stirring 4 190 microliters of the THF solution of THF were subjected to displacement reaction for at least 24 h to obtain hollow gold-silver bimetallic nanoparticles containing block copolymers on the surface, wherein the molar ratio of Au to Ag was 0.5. figure 1 (a) and (b) are t...

Embodiment 2

[0057] (1) Weigh 100 mg of PVP-b-PEO block copolymer (ie, polyvinylpyridine-polyethylene oxide block copolymer), add 24.0 mg of silver nitrate and 10 g of solvent tetrahydrofuran, stir for at least 1 day to form a colorless and transparent To the solution, add 20 mg of BPH (2,4-dihydroxybenzophenone), and irradiate the above solution with ultraviolet rays with a wavelength of 254 nm for 16 hours to obtain a yellow Ag nanoparticle solution. The surface of the Ag nanoparticle contains block copolymer .

[0058] (2) Take 400 mg of the prepared silver nanoparticle solution and add HAuCl 4 The solution (1mg / ml) was 18 μl, and the displacement reaction was carried out for at least 24 hours to obtain hollow bimetallic Ag-Au (wherein the molar ratio of Au to Ag was 0.39) nanoparticles containing block copolymers on the surface.

[0059] (3) The hollow bimetallic nanoparticles containing the block copolymer prepared above were further diluted to a concentration of 0.05wt%, and then a titani...

Embodiment 3

[0062] Weigh 100 mg of PVP-b-PEO block copolymer, add 24 mg of silver nitrate and 20 g of solvent tetrahydrofuran, stir for at least 1 day to form a colorless and transparent solution, add 20 mg of BPH, and irradiate the above solution with ultraviolet rays with a wavelength of 254 nm for 16 hours , To obtain a yellow Ag nanoparticle solution. Take 400 mg of the prepared silver nanoparticle solution and add HAuCl 4 Solution (1mg / ml) 24μl, carry out displacement reaction for at least 24h to obtain hollow bimetallic Ag-Au nanoparticles (where the molar ratio of Au to Ag is 1.0). The hollow bimetallic nanoparticles containing block copolymer prepared above were further diluted to a concentration of 0.05wt%, and then added dropwise to the sol formed by TTIP under stirring, wherein the volume ratio of titanium dioxide to block copolymer was 5.0% After the addition, continue to stir for 50 minutes. The hollow bimetallic nanoparticles are evenly coated by the sol-gel of titanium dioxi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to View More

Abstract

The invention discloses a hollow bimetal nanoparticle / titanium dioxide core-shell structure. Hollow bimetal nanoparticles are used as the core, titanium dioxide is used as the shell, and a gap is arranged between the hollow bimetal nanoparticles and titanium dioxide. The invention also discloses a preparation method of the core-shell structure and application of the core-shell structure in photocatalytic degradation of organic matters. The preparation method comprises the following steps: by using an amphiphilic block copolymer micelle as a reactor, preparing copolymer-coated nanoparticles, preparing hollow-structure bimetal nanoparticles by using the nanoparticles as a sacrifice template, coating titanium dioxide on the hollow-structure bimetal nanoparticles by a sol-gel process, and removing the block copolymer to obtain the product. The method implements uniform dispersion of the hollow-structure bimetal nanoparticles in the titanium dioxide, prevents the hollow-structure bimetal nanoparticles from accumulation, increases the interfacial area between the noble metal nanoparticles and titanium dioxide material, and obviously enhances the catalytic activity for ultraviolet degradation of organic matters.

Description

technical field [0001] The present invention relates to a hollow bimetallic nanoparticle / titanium dioxide core-shell structure and a preparation method thereof, and also relates to a catalyst for photocatalytically degrading organic matter with the hollow bimetallic nanoparticle / titanium dioxide core-shell structure as an active ingredient and a photocatalyst for photocatalytic degradation of organic matter using the catalyst. Application of catalytic degradation of organic matter. Background technique [0002] Titanium dioxide is an excellent photocatalyst, which has the characteristics of high catalytic activity, good thermal and chemical stability, non-toxicity and low price, and is the preferred environment-friendly photocatalyst. Nano-TiO 2 Photocatalysts can decompose hydrocarbons, halogenated compounds, carboxylic acids, surfactants, dyes, nitrogen-containing organic compounds, organophosphorus pesticides and other substances. However, as a photocatalyst, one of the...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J23/50A62D3/176C02F1/32
Inventor 李学张晓玉袁树龙袁玉珍
Owner UNIV OF JINAN
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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