Composite nanoparticle photocatalyst with Au-TiO2 thorny heterostructure and preparation method thereof

A technology of composite nanoparticles and heterostructures, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of preparing noble metal-thorny TiO, etc., and achieve stable and efficient visible light catalytic performance and antibacterial performance, improved bactericidal effect, and improved separation efficiency

Inactive Publication Date: 2018-11-23
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Noble metal-prickly TiO has been prepared by photoreduction 2 Reports of heterostructures and thus the present invention's low-cost and facile photoredu

Method used

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  • Composite nanoparticle photocatalyst with Au-TiO2 thorny heterostructure and preparation method thereof
  • Composite nanoparticle photocatalyst with Au-TiO2 thorny heterostructure and preparation method thereof
  • Composite nanoparticle photocatalyst with Au-TiO2 thorny heterostructure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Take 30mL of deionized water, add 1.5mL of 5mg / mL titanium tetrafluoride aqueous solution to it, stir at room temperature for 30min, transfer the solution to a reaction kettle, and heat at 100°C for 6 hours to obtain white spiny TiO 2 Colloidal solution of nanoparticles. After the colloidal solution is cooled to room temperature, it is concentrated by centrifugal separation to 20% of the original volume;

[0022] 2) Take 1mL of 5mM chloroauric acid aqueous solution, adjust the pH of the solution to 6 with a mass fraction of 2% sodium hydroxide aqueous solution, then add the concentrated spiny TiO obtained in step 1) to it 2 Colloidal solution 6mL, the mixture was stirred at room temperature and illuminated for 30min to obtain purple-red Au-TiO 2 Colloidal solution of spiny heterostructure composite nanoparticle photocatalyst. The colloidal solution is enriched by centrifugation to obtain a precipitate, and the precipitate is repeatedly washed with deionized water ...

Embodiment 2

[0031] 1) Take 30mL of deionized water, add 1.5mL of 5mg / mL titanium tetrafluoride aqueous solution to it, stir at room temperature for 30min, transfer the solution to a reaction kettle, and heat at 100°C for 6 hours to obtain white spiny TiO 2 Colloidal solution of nanoparticles. After the colloidal solution is cooled to room temperature, it is concentrated by centrifugal separation to 20% of the original volume;

[0032] 2) Take 1mL of 5mM chloroauric acid aqueous solution, adjust the pH of the solution to 8 with a mass fraction of 2% sodium hydroxide aqueous solution, then add the concentrated spiny TiO obtained in step 1) to it 2 Colloidal solution 6mL, the mixture was stirred at room temperature and illuminated for 30min to obtain purple-red Au-TiO 2 Colloidal solution of spiny heterostructure composite nanoparticle photocatalyst. The colloidal solution is enriched by centrifugation to obtain a precipitate, and the precipitate is repeatedly washed with deionized water ...

Embodiment 3

[0039] 1) Take 30mL of deionized water, add 1.5mL of 5mg / mL titanium tetrafluoride aqueous solution to it, stir at room temperature for 30min, transfer the solution to a reaction kettle, and heat at 100°C for 6 hours to obtain white spiny TiO 2 Colloidal solution of nanoparticles. After the colloidal solution is cooled to room temperature, it is concentrated by centrifugal separation to 20% of the original volume;

[0040] 2) Take 1mL of 5mM chloroauric acid aqueous solution, adjust the pH of the solution to 8 with a mass fraction of 2% sodium hydroxide aqueous solution, then add the concentrated spiny TiO obtained in step 1) to it 2 Colloidal solution 1.2mL, the mixture was stirred at room temperature and illuminated for 30min to obtain purple-red Au-TiO 2 Colloidal solution of spiny heterostructure composite nanoparticle photocatalyst. The colloidal solution is enriched by centrifugation to obtain a precipitate, and the precipitate is repeatedly washed with deionized wate...

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Abstract

The invention provides a composite nanoparticle photocatalyst with the Au-TiO2 thorny heterostructure and a preparation method thereof, and belongs to the technical field of semi-conductor photocatalysts. Compared with the methods that TiO2 grows on well-prepared Au nanoparticles serving as seeds or Au nanoparticles are precipitated on a TiO2 material through chemical reduction, the preparation method of the composite nanoparticle photocatalyst effectively avoids the situations that a surface active agent is utilized to stabilize the Au nanoparticles and using of a chemical reducing agent, andmakes Au be tightly contacted with TiO2. The preparation method is beneficial for improvement of the preparation repeatability of the composite nanoparticle photocatalyst with the Au-TiO2 thorny heterostructure and the catalysis efficiency and stability thereof when serving as a visible-light-driven photocatalyst. A test result proves that the visible light (lambda<max> 420nm) catalysis effect and the sterilizing effect of the catalyst are obviously improved than commercialized TiO2 (P25). The composite nanoparticle photocatalyst has the advantages that the preparation method is simple, the repeatability is good, large-scale production can be implemented, and has the good application prospect in the fields of photocatalytical degradation of environmental pollutants, sterilization, solar cells and solar hydrogen production.

Description

technical field [0001] The invention belongs to the technical field of semiconductor photocatalysts, in particular to an Au-TiO 2 Prickly heterostructure composite nanoparticle photocatalyst and preparation method thereof. Background technique [0002] With the acceleration of industrialization, the problems of environmental pollution and resource shortage are becoming more and more serious. As a new type of green technology, photocatalytic technology has gradually attracted the attention of researchers at home and abroad by virtue of its advantages of directly utilizing solar energy. Of which titanium dioxide (TiO 2 ) is considered to be one of the most promising photocatalysts due to its good chemical stability, commercial applicability, and ability to completely degrade organic pollutants. TiO 2 It is also an efficient antibacterial agent, when photons larger than the forbidden band gap irradiate TiO 2 When , it will be excited to generate hole-electron pairs, follow...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01J35/02B01J37/16B01J37/34
CPCB01J23/52B01J35/004B01J35/023B01J35/026B01J37/16B01J37/344
Inventor 孙航汤亚男商殷兴秦蓁曾珊
Owner JILIN UNIV
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