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A method of preparing a layered perovskite type 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 unfavorable large-scale production preparations, cumbersome photocatalyst synthesis methods, etc. problems, achieve excellent water splitting performance, realize large-scale production, and achieve the effect of low synthesis cost

Active Publication Date: 2017-06-30
UNIV OF SHANGHAI FOR SCI & TECH
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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 method of preparing a layered perovskite type strontium- tantalum-based ternary oxide photocatalyst
  • A method of preparing a layered perovskite type strontium- tantalum-based ternary oxide photocatalyst
  • A method of preparing a layered perovskite type strontium- tantalum-based ternary oxide photocatalyst

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Embodiment 1

[0021] The preparation method of a layered perovskite-type strontium-tantalum-based ternary oxide photocatalyst of the present embodiment includes the following steps:

[0022] Step 1, take by weighing 0.5mmol (0.2209g) Ta respectively 2 O 5 Solid powder with 1mmol (0.1476g) SrCO 3 The solid powders are mixed and then ground uniformly to obtain a 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 mixed precursor powder, and mix and grind with the precursor powder to obtain a mixture.

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

[0025] In step 4, the mixture of recrystallized salt and strontium-tantalum-based oxide is fully washed with deionized water, and the washed mixture of recrystallized s...

Embodiment 2

[0032] In Embodiment 2, the same steps as those in Embodiment 1 are given the same symbols and the same explanations are omitted.

[0033] In this example, 1.4 mmol (0.2066 g) SrCO was weighed in step 1 3 solid powder, Ta 2 O 5 The solid powder is exactly the same as in Example 1, and the rest of the implementation steps and conditions are the same as those in Example 1.

[0034] like figure 1 As shown, the sample powder of the layered perovskite-type strontium-tantalum-based ternary oxide photocatalyst prepared by the method of this example by X-ray diffraction is compared with the standard PDF card, and it is found that each peak shape position can match no other Peak formation, indicating that Sr was obtained 5 Ta 4 O 15 pure phase.

[0035] figure 2 (b) is the Sr obtained by the method for preparing the layered perovskite-type strontium-tantalum-based ternary oxide photocatalyst according to the embodiment of the present invention 5 Ta 4 O 15 SEM image of the p...

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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 preparation method of 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 the excessive emissions of combustion gas by-products such as CO 2 , SO x and NO x And so on, making the energy crisis and environmental pollution become the main survival problems facing human society today. Therefore, the development of clean and renewable energy that can be recycled and used is a key problem to be solved urgently in today's society. Hydrogen energy has a high heat of combustion (140 MJ Kg -1 ), the product after combustion is water, which does not pollute the environment, and has attracted wide attention as an ideal cl...

Claims

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Application Information

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Patent Type & Authority Applications(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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