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Preparation method and application of tantalum-based hierarchical structure hollow nanometer photocatalytic material

A technology of photocatalytic materials and hierarchical structures, applied in chemical instruments and methods, oxygen preparation, physical/chemical process catalysts, etc., to achieve high quantum efficiency of oxygen production, good application prospects and economic benefits

Inactive Publication Date: 2013-05-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] So far, no literature and patents have reported the use of liquid-phase chemistry to prepare tantalum-based hierarchical structure hollow sea urchin nano-photocatalytic materials

Method used

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  • Preparation method and application of tantalum-based hierarchical structure hollow nanometer photocatalytic material
  • Preparation method and application of tantalum-based hierarchical structure hollow nanometer photocatalytic material
  • Preparation method and application of tantalum-based hierarchical structure hollow nanometer photocatalytic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 0.5g of tantalum powder to 0.6mol / L hydrofluoric acid and 50mL of 2mol / L hydrogen peroxide solution.

[0023] Pour the mixed suspension into a 100mL polytetrafluoroethylene-lined stainless steel autoclave, heat up to 220°C, and react for 6 hours. After the reaction, cool in the furnace.

[0024] The reactant was centrifuged to obtain a solid powder, which was washed several times with distilled water and alcohol and then dried at 60°C. Put it into a muffle furnace for sintering at 800°C for 5h. Control the flow rate of ammonia gas in the atmosphere to 20mL / min, and control the temperature of the water bottle to 20°C. Cool down with the furnace after the reaction. Product analysis using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM)

Embodiment 2

[0026] Add 0.5g of tantalum powder to 0.1 mol / L hydrofluoric acid and 50mL of 3mol / L hydrogen peroxide solution.

[0027] Pour the mixed suspension into a 100mL polytetrafluoroethylene-lined stainless steel autoclave, heat up to 300°C, and react for 24 hours. After the reaction, cool with the furnace.

[0028] The reactant was centrifuged to obtain a solid powder, which was washed several times with distilled water and alcohol and then dried at 60°C. Put it into a muffle furnace and sinter at 700°C for 10h. The flow rate of ammonia gas in the atmosphere was controlled to 20mL / min, and the temperature of the water bottle was controlled to 35°C. Cool down with the furnace after the reaction.

Embodiment 3

[0030] Add 1g of tantalum powder to 0.6mol / L hydrofluoric acid and 50mL of 3mol / L hydrogen peroxide solution.

[0031] Pour the mixed suspension into a 100mL polytetrafluoroethylene-lined stainless steel autoclave, heat up to 160°C, and react for 1 hour. After the reaction, cool in the furnace.

[0032] The reactant was centrifuged to obtain a solid powder, which was washed several times with distilled water and alcohol and then dried at 60°C. Put it into a muffle furnace and sinter at 900°C for 20h. Control the flow of ammonia gas in the atmosphere to 60mL / min, and control the temperature of the water bottle to 20°C. Cool down with the furnace after the reaction.

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Abstract

The invention discloses a preparation method and application of a tantalum-based hierarchical structure hollow nanometer photocatalytic material. Metal tantalum powder is employed as a raw material, and mixed with hydrofluoric acid and hydrogen peroxide to react in a high-pressure reactor at a constant temperature, thereby obtaining a hollow echinoid precipitate with directionally grown surface branches; the tantalum hierarchical structure hollow echinoid oxide powder is obtained after washing the precipitate by ethanol and water and drying; and the tantalum hierarchical structure hollow echinoid oxide powder is further transferred to a heat treatment furnace to carry out nitriding heat treatment, and nitric oxides and nitrides of tantalum with different nitrogen contents can be obtained by controlling the proportion of ammonia and steam, flow and time. The prepared tantalum-based hierarchical structure hollow nanometer photocatalytic material is obviously enhanced in water decomposition rate, and can be further improved in catalytic performance after compounding. The tantalum-based hierarchical structure hollow nanometer photocatalytic material with visible-light response prepared by the preparation method disclosed by the invention has greater light quantum conversation efficiency, can be used for solar transformation and utilization, and has good application prospect and economic benefit in hydrogen production by photolysis of water, air purification, water treatment and other aspects.

Description

[0001] technical field [0002] The invention belongs to the preparation of nanometer material and its application in the field of new energy. It specifically relates to a preparation method of a tantalum oxide, a tantalum oxynitride and a tantalum nitride hierarchical structure hollow nanometer photocatalytic material and the application of the hierarchical junction material as a photocatalyst in solar energy visible light splitting water. [0003] Background technique [0004] The biggest problem facing mankind at present is sustainable development, and the protection of energy and natural environment is its key. At present, the research and application of photocatalytic reactions in environmental governance and energy development are quite active. Photocatalytic reaction refers to the formation of photogenerated hole-electron pairs with strong oxidation ability on the valence band and conduction band by irradiating the photocatalyst, thereby degrading organic pollutants ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B3/04C01B13/02
CPCY02E60/364Y02E60/36Y02P20/133
Inventor 朱鸿民王政侯军刚焦树强黄凯
Owner UNIV OF SCI & TECH BEIJING
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