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A high photocatalytic activity single-phase ferroelectric nanomaterial and its preparation method

A technology of nanomaterials and catalytic activity, applied in the field of catalytic new energy materials, can solve the problems of limited practical application and low absorption efficiency

Active Publication Date: 2021-06-25
XINYANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously TiO 2 The absorption efficiency for the solar spectrum is too low, which greatly limits its practical application
In addition, TiO 2 The internal photogenerated electron-hole pair recombination rate is also high, which inhibits the further improvement of its photocatalytic activity.

Method used

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  • A high photocatalytic activity single-phase ferroelectric nanomaterial and its preparation method

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preparation example Construction

[0031] The application also provides chemical formula as [Bi 2 o 2 ][(Bi 0.9 SM 0.1 )(Fe 0.5 Nb 1.5 )O 7 ] The preparation method of the nanometer material, it may further comprise the steps:

[0032] Add the bismuth source, samarium source, iron source and niobium source into the diluted acid solution according to the stoichiometric ratio, and stir for half an hour to obtain a uniform mixed solution;

[0033] The homogeneous mixed solution was neutralized by adding alkali solution dropwise, and the final alkali concentration of the mixed solution was adjusted to 3mol / L, and the final volume was adjusted to 80mL, and then the obtained yellow suspension was transferred to a polytetrafluoroethylene with a volume of 100mL In the ethylene reactor, put the reactor into an oven at last, and conduct heat treatment under certain conditions to obtain the target powder;

[0034] The obtained target powder is repeatedly centrifuged, washed to neutrality, and then dried to obtain t...

Embodiment 1

[0043] (1) According to the molecular formula stoichiometric ratio weighing 1.8756g purity is 99% bismuth nitrate pentahydrate, 0.0448g purity is 99% samarium nitrate, 0.2693g purity is 98.5% iron nitrate nonahydrate and 0.3198g trihydrate pentoxide Diniobium was added successively to 20 mL of dilute nitric acid with a concentration of 4 mol / L, and the stirring was continued for half an hour to obtain a homogeneous mixture.

[0044] (2) The above-mentioned homogeneous mixed solution was neutralized by dropping sodium hydroxide solution, and the final alkali concentration of the mixed solution was guaranteed to be 3 mol / L by accurately controlling the added sodium hydroxide content (11.36 g), and the final volume was 80 mL. The resulting yellow suspension was then transferred to a polytetrafluoroethylene reactor with a capacity of 100 mL. Finally, put the reactor into an oven, set the heat treatment temperature at 200° C., and the heat treatment time at 72 hours.

[0045] (3) ...

Embodiment 2

[0054] (1) according to molecular formula stoichiometric ratio weighing 1.8756g purity is 99% bismuth nitrate pentahydrate, 0.0448g purity is 99% samarium nitrate, 0.2693g purity is 98.5% ferric nitrate nonahydrate and 0.5403g niobium pentachloride Then add 20 mL of dilute nitric acid with a concentration of 4 mol / L in sequence, and continue stirring for half an hour to obtain a uniform mixed solution.

[0055] (2) The above-mentioned homogeneous mixed solution was neutralized by dropping sodium hydroxide solution, and the final alkali concentration of the mixed solution was guaranteed to be 3 mol / L by accurately controlling the added sodium hydroxide content (11.36 g), and the final volume was 80 mL. The resulting yellow suspension was then transferred to a polytetrafluoroethylene reactor with a volume of 100 mL. Finally, put the reactor into an oven, set the heat treatment temperature at 200° C., and the heat treatment time at 72 hours.

[0056] (3) The powder obtained by hyd...

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Abstract

The invention provides a single-phase ferroelectric nanomaterial with high photocatalytic activity and a preparation method thereof, which mainly consists of a fluorite structural layer [Bi 2 o 2 ] 2+ and perovskite-like layers [(Bi 0.9 SM 0.1 )(Fe 0.5 Nb 1.5 )O 7 ] 2‑ It is stacked alternately along the C direction. Because the single-phase nanomaterial has the above-mentioned structural characteristics, there is a built-in electric field induced by ferroelectric spontaneous polarization inside, and at the same time, the cleavage of the 3d orbital of Fe element in the ferrite octahedron makes it have a large energy density in the visible light region. light absorption. These two characteristics make the single-phase nanomaterial exhibit high photodegradation activity for both the colored organic pollutant rhodamine B and the colorless organic pollutant salicylic acid in the visible light region. The present application also provides a synthesis method of the nanometer material.

Description

technical field [0001] The invention relates to the technical field of catalytic new energy materials, in particular to a ferroelectric nanometer material with high photocatalytic activity and a preparation method thereof. Background technique [0002] In recent years, environmental pollution has become increasingly serious, and water pollution, especially industrial printing and dyeing wastewater, has posed a great threat to the sustainable and healthy development of human society. According to statistics, 100-200 tons of water is consumed per ton of textile printing and dyeing, of which 80-90% become waste water. Textile printing and dyeing wastewater has the characteristics of large water volume, high content of organic pollutants, and high alkalinity, and is one of the most difficult industrial wastewater to treat. How to effectively remove a large number of organic pollutants in printing and dyeing wastewater is a key step in solving wastewater pollution. Photocatalyt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/843C02F1/30C02F103/30
Inventor 殷小丰孙书杰程念雷宝田永尚赵珂李渊
Owner XINYANG NORMAL UNIVERSITY
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