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Method for selectively depositing homogeneous nanoparticles on the surface of titanium dioxide microcrystals to enhance photocatalytic activity

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

Active Publication Date: 2019-07-05
ZHEJIANG UNIV
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  • 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

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  • Method for selectively depositing homogeneous nanoparticles on the surface of titanium dioxide microcrystals to enhance photocatalytic activity
  • Method for selectively depositing homogeneous nanoparticles on the surface of titanium dioxide microcrystals to enhance photocatalytic activity
  • Method for selectively depositing homogeneous nanoparticles on the surface of titanium dioxide microcrystals 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 TiO 2 The microcrystal has a typical truncated octahedral morphology, consisting of two square (001) high-energy faces with top and bottom...

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.

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Abstract

The invention discloses a method for selectively depositing homogeneous nanoparticles on the surface of titanium dioxide microcrystals to enhance photocatalytic activity. The method comprises the following steps: dispersing titanium dioxide microcrystals with (001) surface exposure into an aqueous solution of titanium tetrafluoride, and holding the temperature of the solution for a certain time toselectively grow titanium dioxide nanoparticles on the (101) crystal surface of the microcrystals. The invention skillfully utilizes two dynamic processes of selective adsorption of fluorine ions onhigh energy surface and heterogeneous nucleation and growth of titanium dioxide nanoparticles in the reaction system, The nano-morphology of (001) high-energy surface with high photocatalytic activityin titanium dioxide microcrystals is successfully preserved, and the nano-modification of other crystal surfaces is realized, finally the photocatalytic activity of the crystallites is improved obviously.

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

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Application Information

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IPC IPC(8): B01J21/06
CPCB01J21/063B01J35/39
Inventor 邢欢吴进明
Owner ZHEJIANG UNIV
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