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Preparation method and application of particle uniformly-coated heterojunction type photo-catalytic material

A technology with uniform particles and heterojunctions, which is applied in chemical instruments and methods, oxygen preparation, physical/chemical process catalysts, etc., can solve the problems of limited applications and restrictions, and achieve good catalytic water splitting activity and high oxygen production quantum The effect of efficiency, good application prospects and economic benefits

Inactive Publication Date: 2012-04-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But since TiO 2 The forbidden band width is 3.2eV, and the absorption edge is in the ultraviolet range less than 420nm, which greatly limits its application in sunlight rich in visible light.
Therefore, it is limited in practical application

Method used

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  • Preparation method and application of particle uniformly-coated heterojunction type photo-catalytic material
  • Preparation method and application of particle uniformly-coated heterojunction type photo-catalytic material
  • Preparation method and application of particle uniformly-coated heterojunction type photo-catalytic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take Ta 3 N 5 : Ta = 50% as an example. First, add 0.5g tantalum chloride into 140mL carbon tetrachloride solvent, add 0.5mg Ta powder into the prepared solution, and then add it into the liquid ammonia solution of K for reaction, TaCl 5The molar ratio to K is 1:5, the reaction time is 90 minutes, and then heat treatment is carried out in an ammonia atmosphere furnace at a temperature of 900 °C for 2 hours to obtain a heterojunction photocatalyst.

Embodiment 2

[0024] Take Ta 3 N 5 : Ta = 10% as an example. First, add 0.5g tantalum bromide to 2mL ethyl bromide solvent, add 5mg Ta powder to the prepared solution, and then add it to the liquid ammonia solution of Na for reaction, TaBr 5 The molar ratio to Na is 1:5.5, the reaction time is 60 minutes, and then heat treatment is carried out in an argon atmosphere furnace at a temperature of 800 °C for 4 hours to obtain a heterojunction photocatalyst.

Embodiment 3

[0026] Take Ta 3 N 5 : TaON = 20% as an example. First, add 0.5g tantalum bromide to 100mL carbon tetrachloride solvent, add 0.1g TaON powder to the prepared solution, and then add it to the liquid ammonia solution of Na for reaction, TaBr 5 The molar ratio to Na was 1:5, the reaction time was 60 minutes, and then heat treatment was carried out in an argon atmosphere furnace at a temperature of 700°C for 6 hours to obtain a heterojunction photocatalyst.

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Abstract

The invention discloses a preparation method and application of a particle uniformly-coated heterojunction type photo-catalytic material. The method comprises the following steps of: proportioning Ta, Ta2O5 or TaON serving as a core according to a mass ratio of 0.001:(1-1):1; adding into an organic solvent in which tantalum halide is dissolved; uniformly wrapping and dispersing on the surface of the core to form a heterojunction precursor by using liquid tension; adding into ammonia liquid solution of Na or K; performing in-situ reduction reaction by taking the heterojunction precursor and alkaline metal as reaction raw materials to form a Ta3N5 wrapped heterojunction photo-catalyst; and finally, thermally treating the heterojunction photo-catalyst at the temperature of 600-900 DEG C. Therate of decomposing water and degrading pollutant by the prepared nano heterojunction structure visible light photo-catalytic material is obviously increased. The prepared Ta3N5 particle uniformly-coated heterojunction photo-catalyst responding to visible light has higher light quantum conversion efficiency, is used for solar conversion and utilization as well as environmental improvement, and has excellent application prospect and economic benefit in aspects of hydrogen making by water photolysis, air purification, water treatment and the like.

Description

technical field [0001] The invention belongs to the preparation of nanometer heterojunction material and its application in the field of new energy. Specifically related to a Ta 3 N 5 The particles are uniformly coated in Ta, Ta 2 o 5 Or the preparation method of the heterojunction photocatalyst material on the surface of TaON and the application of the heterojunction material as photocatalyst in solar visible light splitting water. Background technique [0002] 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 on photocatalytic reaction in environmental governance and energy development is 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 or decomposing water into hydr...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/02C01B13/02C02F1/30
Inventor 朱鸿民王政候军刚焦树强黄凯
Owner UNIV OF SCI & TECH BEIJING
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