Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for selectively depositing homogeneous nanoparticles on the surface of titanium dioxide crystallites to enhance photocatalytic activity

A technology of photocatalytic activity and titanium dioxide, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of low catalytic activity

Active Publication Date: 2020-05-08
ZHEJIANG UNIV
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its relatively large size, the micron-sized (001) surface exposed TiO 2 The photocatalytic activity of microcrystals is relatively low. Researchers often use doping, noble metal deposition, composite graphene or other photocatalysts to improve the photoresponse range of the catalyst and inhibit the ineffective recombination of photogenerated carriers, thereby improving its photocatalytic activity.
Existing deposition techniques inevitably cover the (001) high-energy surface with high photocatalytic activity, and to some extent lose the ability to prepare (001) surface exposed TiO 2 The original intention of microcrystal

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
  • A method for selectively depositing homogeneous nanoparticles on the surface of titanium dioxide crystallites to enhance photocatalytic activity
  • A method for selectively depositing homogeneous nanoparticles on the surface of titanium dioxide crystallites to enhance photocatalytic activity
  • A method for selectively depositing homogeneous nanoparticles on the surface of titanium dioxide crystallites to enhance photocatalytic activity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Measure 3mL of 30% hydrogen peroxide and 0.1mL of 35% hydrofluoric acid aqueous solution and uniformly disperse them in 27mL of deionized water, weigh 10mg of titanium powder and disperse them to form a reaction system;

[0027] 2) Transfer the above reaction system into a 50mL polymer-lined stainless steel hydrothermal kettle, and react at 180°C for 10 hours to obtain a precipitate;

[0028] 3) The prepared precipitate was washed three times with 6000r / min centrifugal water, then washed three times with 6000r / min centrifugal ethanol, dried at 60°C and then heat-treated at 400°C for 1 hour to prepare TiO with (001) surface exposed 2 Microcrystalline.

[0029] The field emission scanning electron microscope morphology of the sample prepared according to Example 1 is as follows: figure 1 shown. It can be seen from the figure that the TiO 2 The microcrystal has a typical truncated octahedral morphology, consisting of two square (001) high-energy faces with top and bo...

Embodiment 2

[0032] 1) Weigh 20 mg of TiO exposed on the (001) surface prepared according to Example 1 2 Microcrystalline, dispersed in 15 mL of TiF at a concentration of 0.04 mol / L 4 in aqueous solution;

[0033] 2) Transfer the solution into an oven at 60°C and let it stand for 6 hours;

[0034] 3) Separate and wash the precipitate.

[0035] The field emission scanning electron microscope morphology of the sample prepared according to Example 2 is as follows: image 3 shown. It can be seen from the figure that after reacting in the solution at 60°C for 6 hours, the TiO prepared according to Example 2 2 Uniform distribution of TiO on the (101) plane of the crystallite 2 Nanoparticles, with an average size of 50-80 nanometers. while successfully retaining TiO 2 The (001) high-energy facets with high photocatalytic activity in the microcrystals remain unchanged.

[0036] Prepare the X-ray diffraction pattern of sample according to embodiment 2 as Figure 4 As shown, according to JC...

Embodiment 3

[0038] 1) with embodiment 2;

[0039] 2) Transfer the solution to a 60°C oven and let it stand for 12 hours;

[0040] 3) Separate and wash the precipitate.

[0041] Figure 5 The microcrystalline morphology photographs show that the TiO 2 Selective deposition of nanoparticles on the (101) facets of the crystallites, leaving the high-energy (001) facets unaffected.

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
Login to View More

Abstract

The invention discloses a method for selectively depositing homogeneous nanoparticles on the surface of titanium dioxide microcrystals to improve photocatalytic activity. The method is to disperse titanium dioxide microcrystals with exposed (001) planes into a titanium tetrafluoride aqueous solution and keep the temperature for a certain period of time to selectively grow titanium dioxide nanoparticles on the (101) crystal planes of the microcrystals. This invention cleverly utilizes the two dynamic processes of selective adsorption of fluoride ions on high-energy surfaces in the reaction system and non-uniform nucleation and growth of titanium dioxide nanoparticles, and successfully retains (001) high-energy surface nanoparticles with high photocatalytic activity in titanium dioxide microcrystals. The morphology remains unchanged, and nano-modification of other crystal faces is achieved at the same time, ultimately achieving a significant improvement in the photocatalytic activity of microcrystals.

Description

technical field [0001] The method of the invention relates to a method for selectively depositing titanium dioxide nanoparticles on titanium dioxide microcrystals exposed on the (001) surface, so as to obviously improve the photocatalytic activity of the titanium dioxide microcrystals, and belongs to the technical field of environmental materials. Background technique [0002] As an advanced oxidation technology, photocatalytic technology has great development potential and is an effective solution to the increasingly serious environmental pollution and energy crisis. Titanium dioxide (TiO 2 ) has the advantages of good chemical stability, low cost, and environmental friendliness, and is currently the best photocatalyst choice for photocatalytic industrial applications. Common TiO 2 The crystal phases are anatase, rutile, brookite and TiO 2 (B) and so on, among which, the anatase phase possesses the relatively best photocatalytic activity. [0003] Anatase phase TiO 2 T...

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 Patents(China)
IPC IPC(8): B01J21/06
CPCB01J21/063B01J35/39
Inventor 邢欢吴进明
Owner ZHEJIANG UNIV
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com