Double-shell titanium dioxide catalyst with high photocatalytic hydrogen generation performance and preparation method thereof

A technology of titanium dioxide and black titanium dioxide is applied in the field of semiconductor catalysts and their preparation, which can solve the problems of low hydrogen production and low photocatalytic activity, and achieve the effects of increased hydrogen production, high catalytic activity and mild reaction conditions.

Active Publication Date: 2016-07-20
信挚科技实业深圳有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low photocatalytic activity of existing black titanium dioxide, resulting in low hydrogen production when used

Method used

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  • Double-shell titanium dioxide catalyst with high photocatalytic hydrogen generation performance and preparation method thereof
  • Double-shell titanium dioxide catalyst with high photocatalytic hydrogen generation performance and preparation method thereof
  • Double-shell titanium dioxide catalyst with high photocatalytic hydrogen generation performance and preparation method thereof

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specific Embodiment approach 1

[0021] Embodiment 1: This embodiment is a double-shell titanium dioxide catalyst with high photocatalytic hydrogen production performance, which is composed of a titanium dioxide crystal core, a reduced amorphous layer and an oxidized crystal shell sequentially from the inside to the outside.

[0022] Compared with existing catalysts, the titanium dioxide catalyst with a special core-shell structure in this embodiment has higher catalytic activity and better stability, and is a commercially available titanium dioxide P 25 2.2 times that of black titanium dioxide powder, and 1.3 times that of black titanium dioxide powder. Moreover, it has low cost, no pollution, and can be used in large-scale production.

specific Embodiment approach 2

[0023] Specific embodiment two: This embodiment is a preparation method of a double-shell titanium dioxide catalyst with high photocatalytic hydrogen production performance, which is specifically completed according to the following steps:

[0024] 1. Grinding and mixing: commercial titanium dioxide P 25 and NaBH 4 Mix and grind for 20min to 30min to obtain the mixture; the titanium dioxide P 25 with NaBH 4 The mass ratio is 2:(0.6~0.7);

[0025] 2. Annealing reduction: move the mixture into an alumina crucible, then place it in a tube furnace, and raise the temperature from room temperature to 300°C to 400°C at a heating rate of 5°C / min to 10°C / min under a nitrogen atmosphere, and Treat at 300°C-400°C and nitrogen atmosphere for 20min-60min, then cool to room temperature with the furnace to obtain the reacted powder;

[0026] 3. Washing: first wash the reacted powder with ethanol for 2 to 5 times, then wash with deionized water for 2 to 5 times, and finally dry it in a bl...

specific Embodiment approach 3

[0031] Specific embodiment three: the difference between this embodiment and specific embodiment two is: in step one, commercial titanium dioxide P 25 and NaBH 4 Mix and grind for 30min to obtain a mixture; the commercial titanium dioxide P 25 with NaBH 4 The mass ratio is 2:0.66. Others are the same as in the second embodiment.

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Abstract

The invention discloses a double-shell titanium dioxide catalyst with high photocatalytic hydrogen generation performance and a preparation method thereof, and relates to the field of semiconductor photocatalytic degradation water hydrogen generation materials, in particular to a semiconductor catalyst and a preparation method thereof. The catalyst aims at solving the problems that existing black titanium dioxide is low in photocatalytic activity and low in hydrogen generation amount when used as a photocatalyst for hydrogen generation. The catalyst is sequentially composed of a titanium dioxide crystal core, a reduction non-crystal layer and an oxidation crystal shell from inside to outside. The preparation method includes the steps of firstly, grinding and mixing, secondly, annealing; thirdly, washing to obtain black titanium dioxide powder; fourthly, oxidizing to obtain the double-shell titanium dioxide catalyst with high photocatalytic hydrogen generation performance. The catalyst has the advantages that the service life of electrons and electron holes is prolonged, the electron concentration is increased, and the hydrogen generation amount is remarkably increased when the catalyst is used as a photocatalyst for hydrogen generation. The preparation method is mainly used for preparing the double-shell titanium dioxide catalyst.

Description

technical field [0001] The invention relates to the field of semiconductor photocatalytic water splitting hydrogen production materials, in particular to a semiconductor catalyst and a preparation method thereof. Background technique [0002] Facing the depletion of fossil energy and the increasing demand for energy, as well as the resulting environmental pollution, climate warming and other issues, how to develop and utilize new clean energy has received great attention. Under the requirement of sustainable development, hydrogen energy is regarded as one of the most promising energy sources. In recent decades, photocatalytic water splitting has attracted a large number of researchers because of its low cost and environmental friendliness. Therefore, this technology provides a possible route for large-scale hydrogen production as a renewable energy dye. [0003] Titanium dioxide (TiO 2 ) as a typical n-type semiconductor material is a widely used wide bandgap semiconducto...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J23/42C01B3/04
CPCB01J21/063B01J23/42B01J35/004B01J35/0073B01J37/08C01B3/042C01B2203/1041C01B2203/107Y02E60/36
Inventor 徐玲玲曹琬璐魏波马宁
Owner 信挚科技实业深圳有限公司
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