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A kind of preparation method of layered perovskite strontium tantalum-based ternary oxide photocatalyst

A strontium-tantalum-based ternary and perovskite-type technology, which is applied in the field of preparation of layered perovskite-type strontium-tantalum-based ternary oxide photocatalysts, can solve the problem of cumbersome photocatalyst synthesis methods and unfavorable large-scale production preparations, etc. problems, achieve excellent water splitting performance, realize large-scale production, mild reaction conditions and environmental protection

Active Publication Date: 2020-05-01
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the synthesis methods of the above photocatalysts are cumbersome and not conducive to large-scale production. Therefore, it is particularly important to develop new photocatalysts with high photocatalytic activity and their simple preparation methods.

Method used

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  • A kind of preparation method of layered perovskite strontium tantalum-based ternary oxide photocatalyst
  • A kind of preparation method of layered perovskite strontium tantalum-based ternary oxide photocatalyst
  • A kind of preparation method of layered perovskite strontium tantalum-based ternary oxide photocatalyst

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Embodiment 1

[0021] A method for preparing a layered perovskite-type strontium-tantalum-based ternary oxide photocatalyst in this embodiment comprises the following steps:

[0022] Step 1, weigh 0.5mmol (0.2209g) Ta 2 o 5 Solid powder and 1mmol (0.1476g) SrCO 3 The solid powders are mixed and then ground evenly to obtain the mixed precursor powder.

[0023] Step 2: Weigh the mixed salt composed of NaCl and KCl, the total mass of which is twice that of the above mixed precursor powder, mix and grind with the precursor powder to obtain a mixture evenly.

[0024] In step 3, the mixture is calcined at 850° C. for 4 hours in a high-temperature muffle furnace, and cooled naturally to room temperature after the reaction, to obtain a mixture of recrystallized salt and strontium-tantalum-based oxide.

[0025] Step 4: Fully wash the mixture of recrystallized salt and strontium-tantalum-based oxide with deionized water, dry the washed mixture of recrystallized salt and strontium-tantalum-based oxi...

Embodiment 2

[0032] In this second embodiment, the same steps as in the first embodiment are given the same symbols and the same explanations are omitted.

[0033] Weigh 1.4mmol (0.2066g) SrCO in step 1 in this embodiment 3 solid powder, Ta 2 o 5 Solid powder is identical with embodiment 1, and all the other implementation steps and conditions are identical with embodiment 1.

[0034] Such as figure 1 As shown, the sample powder of the layered perovskite-type strontium-tantalum-based ternary oxide photocatalyst prepared by the method of X-ray diffraction in this embodiment is compared with the standard PDF card, and it is found that each peak shape position can match without other The peak is formed, indicating that the Sr 5 Ta 4 o 15 pure phase.

[0035] figure 2 (b) is the Sr obtained by the preparation method of the layered perovskite-type strontium-tantalum-based ternary oxide photocatalyst of the embodiment of the present invention 5 Ta 4 o 15 Scanning electron microscope ...

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Abstract

The invention provides a method for preparing a layered perovskite-type strontium-tantalum-based ternary oxide photocatalyst, which is characterized in that it includes the following steps: Step 1, the molar ratio of Ta / Sr is 1:1 to 1:1.4 Weigh it 2 O 5 Solid powder and SrCO 3 Mix the solid powders and grind them evenly to obtain mixed precursor powder; step two, weigh the mixed salt composed of NaCl and KCl, mix and grind it with the precursor powder to obtain a mixture. The mass ratio of the mixed salt to precursor powder is 1: 1~1:0.1; Step three, use a high-temperature muffle furnace to calcine the mixture at 750℃~850℃ for 2h~24h. After the reaction is completed, it is naturally cooled to room temperature to obtain a mixture of recrystallized salt and strontium tantalum-based oxide; step four, Fully wash the mixture of recrystallized salt and strontium tantalum-based oxide with deionized water, use a drying box to dry the washed mixture of recrystallized salt and strontium-tantalum based oxide at 60°C for 2h to 24h, and then grind it to obtain a layer Sample powder of perovskite-type strontium-tantalum-based ternary oxide photocatalyst.

Description

technical field [0001] The invention belongs to the technical field of semiconductor photocatalytic hydrogen production, and relates to a method for preparing a layered perovskite-type strontium-tantalum-based ternary oxide photocatalyst. Background technique [0002] Since the 21st century, with the rapid development of industry, fossil fuels such as coal, oil, natural gas and other non-renewable fossil fuels have been widely used and excessive emissions of combustion gas by-products such as CO 2 , SO x and NO x etc., making the energy crisis and environmental pollution the main survival problems faced by human society today. Therefore, the development of clean and renewable energy that can be recycled is a key issue that needs to be solved urgently in today's society. Hydrogen energy has a high heat of combustion (140·MJ Kg -1 ), the product of combustion is water, which has no pollution to the environment, and has attracted wide attention as an ideal clean energy with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/20
CPCB01J23/002B01J23/20B01J35/39
Inventor 王平孙峰王现英宜周翔杨姮妍李慧珺
Owner UNIV OF SHANGHAI FOR SCI & TECH
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