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Tungsten oxide hydrate heterogeneous junction photocatalyst as well as preparation method and application thereof

A tungsten oxide hydrate and catalyst technology, applied in the field of photocatalysis, can solve problems such as low lattice matching, charge transfer hindrance, and weak junction

Active Publication Date: 2021-02-09
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"Heterojunction" refers to the interface region formed between different substances, but because it is two different substances, the "junction" formed by it is not very strong, and the lattice matching degree of the two different substances is not high , the charge transfer is hindered

Method used

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  • Tungsten oxide hydrate heterogeneous junction photocatalyst as well as preparation method and application thereof
  • Tungsten oxide hydrate heterogeneous junction photocatalyst as well as preparation method and application thereof
  • Tungsten oxide hydrate heterogeneous junction photocatalyst as well as preparation method and application thereof

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preparation example Construction

[0030] The present invention also provides a preparation method of the tungsten oxide hydrate heterogeneous junction photocatalyst described in the above technical solution, comprising the following steps:

[0031] The tungsten and hydrogen peroxide solution are mixed, followed by the oxidation reaction and the first hydrothermal reaction to obtain the cubic phase of WO 3 0.5H 2 O;

[0032] WO of the cubic phase 3 0.5H 2 O and water are mixed for a second hydrothermal reaction to obtain a heterogeneous junction photocatalyst of tungsten oxide hydrate.

[0033] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0034] In the present invention, tungsten and hydrogen peroxide solution are mixed, oxidation reaction and first hydrothermal reaction are carried out sequentially, and cubic phase WO 3 0.5H 2 O: In the present invention, the tungsten is preferably tungsten ...

Embodiment 1

[0048] Mix 3mmol tungsten powder and 45mmol hydrogen peroxide with a mass concentration of 30%, and stir for 60min to obtain a light yellow solution;

[0049] The light yellow solution, 60mlH 2 O and 15 mmol Na 2 SO 4 Mix and adjust the pH=1; the mixed solution is subjected to the first hydrothermal reaction (220°C, 12h), washed and dried to obtain c-WO 3 0.5H 2 O.

[0050] 0.5gc-WO 3 0.5H 2 O and 50gH 2 O mixed, fully stirred, adjusted to pH 1.50 with 3mol / L hydrochloric acid, the mixed solution was subjected to the second hydrothermal reaction (180°C, 0.25h, 12h, 24h, 36h or 42h), washed and dried to obtain a series of oxidation Tungsten Hydrate Heterogeneous Junction Photocatalyst, i.e. c-WO 3 0.5H 2 O / o-WO 3 0.33H 2 O heterogeneous junction (c-WO 3 0.5H 2 O is marked as A, o-WO 3 0.33H 2 O is denoted as B, c-WO 3 0.5H 2 O / o-WO 3 0.33H 2 O out-of-phase junction is recorded as A+B);

[0051] Among them, the second hydrothermal reaction time and c-WO in th...

Embodiment 2

[0061] Mix 3mmol tungsten powder and 90mmol hydrogen peroxide with a mass concentration of 30%, and stir for 60min to obtain a light yellow solution;

[0062] The light yellow solution, 30mlH 2 O and 45 mmol Na 2 SO 4 Mix and adjust the pH=1.5; the mixed solution is subjected to the first hydrothermal reaction (180°C, 12h), washed and dried to obtain c-WO 3 0.5H 2 O.

[0063] 0.5gc-WO 3 0.5H 2 O and 60gH 2 O mixed, stirred well, adjusted the pH value to 1.00 with 3mol / L hydrochloric acid, and subjected the mixed solution to the second hydrothermal reaction (180°C, 0.25h, 12h, 24h, 36h or 42h), washed and dried to obtain a series of oxidation Tungsten Hydrate Heterogeneous Junction Photocatalyst, i.e. c-WO 3 0.5H 2 O / o-WO 3 0.33H 2 O heterogeneous junction (c-WO 3 0.5H 2 O is marked as A, o-WO 3 0.33H 2 O is denoted as B, c-WO 3 0.5H 2 O / o-WO 3 0.33H 2 O out-of-phase junction is recorded as A+B);

[0064]Among them, the second hydrothermal reaction time and ...

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Abstract

The invention relates to the technical field of photocatalysis, in particular to a tungsten oxide hydrate heterogeneous junction photocatalyst as well as a preparation method and application thereof.The invention provides a tungsten oxide hydrate heterogeneous junction photocatalyst. The tungsten oxide hydrate heterogeneous junction photocatalyst comprises WO3. 5H2O in a cubic phase and WO3. 0.33H2O in an orthogonal phase, wherein the mass ratio of the WO3. 5H2O of the cubic phase to the WO3. 0.33 H2O of the quadrature phase is (0.14 to 0.95): (0.05 to 0.86). Results of embodiments show thatwhen the heterogeneous junction photocatalyst provided by the invention is used for photocatalytic decomposition of water, the maximum hydrogen generation amount reaches 17 [mu] mol / h / g, and the heterogeneous junction photocatalyst has high photocatalytic activity and stability.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a tungsten oxide hydrate heterogeneous junction photocatalyst, a preparation method and application thereof. Background technique [0002] The rapid development of science and technology has brought about rapid changes in human life. At the same time, the global energy crisis and environmental pollution are becoming more and more serious. The development of new energy sources and the effective governance of environmental problems have become urgent. In exploring various new energy sources, solar energy has always been considered as one of the cleanest renewable energy sources in the world that can be developed and utilized on a large scale. [0003] Photocatalytic water splitting to produce hydrogen is one of the most challenging reactions for the preparation of fuels from solar energy, in which the effective separation and migration of electrons and holes generated by pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30C01B3/04
CPCB01J23/30C01B3/042C01B2203/0277B01J35/39Y02E60/36
Inventor 张静梁均梅王芳芳
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY