W18O49/ZnTiO3 nitrogen fixation photocatalyst as well as preparation method and application thereof

A technology of photocatalyst and nitrogen fixation, which is applied in the field of photocatalytic materials to achieve strong photocatalytic reduction ability, mild conditions and favorable effects for large-scale production

Active Publication Date: 2022-06-03
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, blue tungsten oxide composite zinc titanate has not been reported as a photocatalyst.

Method used

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  • W18O49/ZnTiO3 nitrogen fixation photocatalyst as well as preparation method and application thereof
  • W18O49/ZnTiO3 nitrogen fixation photocatalyst as well as preparation method and application thereof
  • W18O49/ZnTiO3 nitrogen fixation photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Blue tungsten oxide photocatalyst (W 18 O 49 ) is prepared as follows:

[0026] Dissolve 0.01 mol of tungsten hexachloride in 15 mL of absolute ethanol, stir until blue, put it in a hydrothermal kettle for hydrothermal reaction at 160 °C for 6 h, naturally cool to room temperature, wash with water, dry at 70 °C, and grind to obtain blue Color tungsten oxide powder, namely blue tungsten oxide photocatalyst.

Embodiment 2

[0028] Zinc titanate photocatalyst (ZnTiO 3 ) is prepared as follows:

[0029] Dissolve 0.01mol of zinc acetate in absolute ethanol, add 3mL of concentrated nitric acid, stir for 30min, add 0.01mol of tetra-n-butyl titanate dropwise to the resulting mixed solution, continue stirring for 30min, and put the resulting solution into a hydrothermal kettle Hydrothermal reaction at 160 °C for 6 h, naturally cooled to room temperature, washed with water, dried at 105 °C, and ground to obtain an intermediate product; the intermediate product was placed in a muffle furnace, and heated to 500 °C at a heating rate of 5 °C / min. Calcined in air for 2 hours, cooled to room temperature naturally, and ground to obtain zinc titanate powder, that is, zinc titanate photocatalyst.

Embodiment 3

[0031] W 18 O 49 / ZnTiO 3 The preparation method of nitrogen-fixing photocatalyst is as follows:

[0032] Add 0.0005mol of tungsten hexachloride to absolute ethanol, stir until blue, add 0.0005mol of zinc titanate powder prepared in Example 2, continue to stir for 1 hour, and put the mixed solution into a hydrothermal kettle for hydrothermal reaction at 160°C for 6 hours , to be naturally cooled to room temperature, washed with water, dried at 70 °C, and ground to obtain W 18 O 49 / ZnTiO 3 Nitrogen fixation photocatalyst.

[0033] figure 1 W prepared for Example 1 18 O 49 , the ZnTiO prepared in Example 2 3 and the W prepared in Example 3 18 O 49 / ZnTiO 3 XRD patterns of nitrogen-fixing photocatalysts. from figure 1 It can be seen that ZnTiO 3Corresponding to 5 visible peaks, corresponding to XRD standard card JCPDSNO.39-0190, W 18 O 49 There is only one obvious diffraction peak, and the other small peaks are almost unobservable, which corresponds to the XRD s...

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Abstract

The invention relates to a W18O49 / ZnTiO3 nitrogen fixation photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. The preparation method comprises the following steps: firstly, dissolving tungsten salt in absolute ethyl alcohol, stirring to blue, then adding self-prepared zinc titanate powder, continuously stirring, putting into a high-pressure kettle, carrying out hydrothermal reaction, naturally cooling, washing with water, drying, and grinding to obtain the W18O49 / ZnTiO3 nitrogen fixation photocatalyst. The photocatalyst has relatively strong photocatalytic oxidation-reduction capability, increases visible light catalytic activity, has relatively good photocatalytic nitrogen fixation ammonia production performance, and has great development and application prospects in the aspect of photocatalytic green synthesis of ammonia.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, in particular to a kind of W 18 O 49 / ZnTiO 3 Nitrogen-fixing photocatalyst and preparation method and application thereof. Background technique [0002] On Earth, nitrogen molecules, the main component of the atmosphere, cannot be used by most organisms for nitrogen metabolism, synthesis of biomolecules such as proteins and nucleic acids. However, all life forms depend on nitrogen. However, molecular nitrogen is not nutritious because nitrogen molecules are triple bonds held together by strong N≡N. In addition, most plants can only produce ammonium ions (NH 4 + ) and nitrate ions in the form of nitrogen, although (NO 3 - ) in the atmosphere as high as 78%, rainfall and lightning can also bring a certain amount of nitrogen into the soil, but this happens with the help of specialization. However, these natural nitrogen sources cannot meet the increasing demands of modern ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30C01C1/04
CPCB01J23/30B01J23/002B01J35/004C01C1/0411Y02P20/52
Inventor 范晓星赵宏明周坤李彤彤许超刘畅
Owner LIAONING UNIVERSITY
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