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Bismuth ferrite catalyst and its preparation method and application

A bismuth ferrite and catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem that the charge mobility and photogenerated charges have not reached the ideal level, and achieve regular crystal morphology, Effect of high crystallinity and improved catalytic performance

Active Publication Date: 2021-05-04
德州新动能铁塔发电有限公司
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  • Abstract
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Problems solved by technology

In addition, the charge mobility and recombination of photogenerated charges of the bismuth ferrite catalyst itself are far from ideal and still need to be further improved.

Method used

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  • Bismuth ferrite catalyst and its preparation method and application
  • Bismuth ferrite catalyst and its preparation method and application
  • Bismuth ferrite catalyst and its preparation method and application

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preparation example Construction

[0030] [The preparation method of bismuth ferrite catalyst]

[0031] A first aspect of the present invention provides a kind of preparation method of bismuth ferrite catalyst, it comprises the following steps:

[0032] (1) The preparation step of the bismuth ferrite precursor, which comprises mixing the iron source and the sodium alginate aqueous solution, and adding the bismuth source, and stirring to obtain the bismuth ferrite precursor; and

[0033] (2) The preparation step of the bismuth ferrite catalyst, which comprises mixing the bismuth ferrite precursor with an alkaline solution, mixing and reacting at a temperature suitable for the reaction of the bismuth ferrite precursor and the alkaline solution to obtain ferric acid bismuth catalyst.

[0034] Step (1) is the preparation process of the bismuth ferrite catalyst precursor. Wherein, the iron source provides the iron element of the bismuth ferrite precursor, and the bismuth source provides the bismuth element of the ...

Embodiment

[0048] This embodiment is an exemplary method for preparing a bismuth ferrite catalyst, which includes the following steps:

[0049] (1) Preparation of bismuth ferrite precursor:

[0050] Dissolve 0.1g-0.5g sodium alginate in 20mL deionized water and stir well. Add 2-4mmol ferric chloride (or ferric sulfate, ferric nitrate, etc.) to the sodium alginate solution, stir well and then add 1-2mmol bismuth nitrate so that the molar ratio of bismuth to iron is 1:2. After stirring evenly, a brown precursor mixture was obtained.

[0051] (2) Add 20 mL of 4-7 mol / L NaOH aqueous solution dropwise into the precursor mixture. After stirring evenly, transfer to a 100mL stainless steel reaction kettle, and heat at 200°C for 12-24 hours. After the obtained powder is fully washed, it is dried to prepare bismuth ferrite micro-sheets.

[0052] The X-ray diffraction pattern of the bismuth ferrite catalyst is as follows figure 1 As shown, according to the comparison with the standard card 25-...

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Abstract

The invention discloses a bismuth ferrite catalyst, a preparation method and application thereof. The preparation method of the present invention comprises using sodium alginate aqueous solution as a crystal growth directing agent to prepare a bismuth ferrite precursor, mixing the bismuth ferrite precursor with an alkaline solution, and mixing the bismuth ferrite precursor with an alkaline solution, Reaction at high temperature to obtain bismuth ferrite catalyst. The bismuth ferrite catalyst of the present invention is a pure-phase catalyst, and has the characteristics of simple preparation method, high crystallinity and regular crystal morphology, its catalytic performance is significantly improved, and it has broad application potential in photocatalytic hydrogen production and pollutant photocatalytic degradation. Application prospect.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a bismuth ferrite catalyst and a preparation method and application thereof. Background technique [0002] Multiferroic materials refer to a class of smart materials with two or more ferroic orders (such as ferroelectricity, magnetism, etc.) at the same time, and have been selected as hot scientific issues published by the American "Science" magazine in 2007. Bismuth ferrite Bi 2 Fe 4 o 9 As a single-phase multiferroic material at room temperature, (BFO) not only has excellent ferroelectric properties, but also can realize the control of magnetization by electric field due to the coupling effect between electricity, magnetism and strain. It is a hotspot in the study of new multiferroic materials. The catalyst material has an antiferromagnetic Neel temperature and a ferroelectric Curie temperature much higher than room temperature, and is one of the few single-phase multiferroic materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/843B01J37/10C01B3/04A62D3/17C01G49/00A62D101/26A62D101/28
CPCA62D3/17A62D2101/26A62D2101/28B01J23/002B01J23/8437B01J35/004B01J37/10C01B3/042C01G49/0018C01P2004/20C01P2004/61Y02E60/36
Inventor 张丁
Owner 德州新动能铁塔发电有限公司
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