In-phase junction photocatalyst, preparation method and application thereof

A catalyst and phase junction technology, applied in the field of photocatalysis, can solve the problems of inability to construct heterogeneous junctions, difficulty in separation efficiency of photocatalyst photogenerated charges, etc.

Active Publication Date: 2019-05-10
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many semiconductor photocatalysts do not have two or more crystal phases, and heterogeneous junctions cannot be constructed, and it is still difficult to improve the separation efficiency of photogenerated charges of photocatalysts.

Method used

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  • In-phase junction photocatalyst, preparation method and application thereof
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  • In-phase junction photocatalyst, preparation method and application thereof

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preparation example Construction

[0049] The present invention provides a method for preparing a homogeneous junction photocatalyst described in the above technical solution, comprising: loading a semiconductor material with a small particle diameter on the surface of a semiconductor material with a large particle diameter to obtain a homophase junction photocatalyst.

[0050] The present invention has no special requirements on the sources of the small-diameter semiconductor material and the large-diameter semiconductor material, and commercially available products can be used, or can be prepared by methods well known to those skilled in the art. In the present invention, the loading method preferably includes a mixing method or a hydrothermal method;

[0051] The mixing method preferably includes: providing a dispersion liquid of a small particle size semiconductor material, then immersing a large particle size semiconductor material in the dispersion liquid, and ultrasonically dispersing, so that the small p...

Embodiment 1

[0122] (1) Mix 100mL of absolute ethanol, 100mL of acetonitrile and 1mL of ammonia water to obtain an aqueous ammonia solution; mix 20mL of absolute ethanol, 20mL of acetonitrile and 4mL of tetra-n-butyl titanate to obtain a n-tetrabutyl titanate solution; The n-tetrabutyl ester solution is added dropwise into the ammonia solution for hydrolysis reaction to obtain titanium hydroxide sol. Calcining the obtained titanium hydroxide sol at 500°C for 2 hours to obtain large particle size anatase;

[0123] (2) Measure 0.034mL (0.0001mol) of tetra-n-butyl titanate and 0.034mL of absolute ethanol, mix well, adjust the pH value to 0.9 with nitric acid, adjust the volume of the mixed solution to 20mL with deionized water, and dissolve the solution Incubate at 60°C for 24h. Then add 0.7987g (0.01mol) of the above-prepared large-diameter anatase, stir, transfer to a hydrothermal reaction kettle for 72 hours at 140°C, wash, and dry to obtain anatase "homogeneous junction". Wherein the lo...

Embodiment 2

[0131] (1) Stir 0.5mol / L titanium tetrachloride solution in a constant temperature water bath at 90°C for hydrolysis reaction to obtain titanium hydroxide sol, heat the obtained titanium hydroxide sol at 160°C for 12 hours to obtain large particle size rutile .

[0132] (2) Measure 0.034mL (0.0001mol) of tetra-n-butyl titanate and 0.034mL of absolute ethanol, mix well, adjust the pH value to 0.9 with nitric acid, adjust the volume of the mixed solution to 20mL with deionized water, and dissolve the solution Insulate at 60°C for 24 hours, then heat at 140°C for 72 hours, filter, wash, and dry to obtain anatase with small particle size;

[0133] (3) Mix 0.7987g of large particle size rutile obtained in step (1) and small particle size anatase obtained in step (2) in 50mL of isopropanol solution, ultrasonically disperse for 1h, dry at 90°C, and roast at 700°C 4h, the rutile "homophase junction" high-efficiency photocatalyst was obtained. Wherein the loading of small particle si...

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Abstract

The invention belongs to the technical field of photocatalysis, in particular to an in-phase junction photocatalyst, a preparation method and an application thereof. The in-phase junction photocatalyst comprises in-phase semiconductor materials with different particle diameters, wherein the small particle diameter semiconductor material is loaded on the surface of the large particle diameter semiconductor material; and the particle size ratio of the large particle size semiconductor material to the small particle size semiconductor material is (40-100): 1. The same crystal phase semiconductormaterials with different particle sizes are utilized to form junctions, so that the efficiency of separating photogenerated electrons and holes can be effectively promoted, and the photocatalytic performance of the materials is obviously improved. The embodiment results show that when the in-phase junction photocatalyst is used for photocatalytic decomposition of water, the hydrogen generation amount can reach 150 umol/h/g.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a homogeneous junction photocatalyst and its preparation method and application. Background technique [0002] With the global energy crisis and environmental pollution becoming more and more serious, it is imperative to develop and utilize clean and renewable energy. Solar energy is inexhaustible and inexhaustible. It is currently one of the cleanest renewable energy sources in the world that can be developed and utilized on a large scale. There are many ways to utilize solar energy. Converting solar energy into chemical energy, such as the development of "solar fuels" such as hydrogen, methane, and methanol, is one of them, and this is inseparable from the support of photocatalyst technology. [0003] The biggest challenge facing photocatalytic technology is to improve the separation efficiency of photogenerated charges of catalysts, which directly determine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J23/745B01J35/02B01J35/08C01B3/04C02F1/30C02F101/38
CPCY02E60/36
Inventor 张静陈雪冰周月娥
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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