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
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  • Claims
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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

A method of preparing a layered perovskite type strontium- tantalum-based ternary oxide photocatalyst is provided. The method is characterized by including (1) a step of weighing Ta2O5 solid powder and SrCO3 solid powder, with the mole ratio of Ta / Sr is 1:1-1:1.4, mixing the Ta2O5 solid powder and the SrCO3 solid powder, and fully grinding the mixture to obtain mixed precursor powder; (2) a step of weighing a mixed salt consisting of NaCl and KCl, fully mixing and grinding the mixed salt and the mixed precursor powder to obtain a mixture, with the mass ratio of the mixed salt to the precursor powder being 1:1-1:0.1; (3) a step of calcinating the mixture at 750-850 DEG C for 2-24 h by adopting a high-temperature muffle furnace, and naturally cooling a reaction product to room temperature after the reaction is finished to obtain a mixture of a recrystallized salt and a strontium- tantalum-based oxide; and (4) a step of fully washing the mixture with deionized water, drying the washed mixture at 60 DEG C for 2-24 h by adopting a drying oven, and grinding the mixture to obtain sample powder of the 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
CPCB01J23/002B01J23/20B01J35/004
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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