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Bismuth oxide photocatalyst, preparation method and applications thereof

A photocatalyst, bismuth oxide technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., to achieve high yield, high uniformity, and save production costs Effect

Inactive Publication Date: 2015-08-12
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the above two patents have successfully used the hydrothermal method to prepare bismuth oxide nanomaterials, how to prepare nano-scale β-phase bismuth oxide with superior performance and high purity on a large scale under mild atmospheric pressure and low temperature conditions has not yet been reported.

Method used

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  • Bismuth oxide photocatalyst, preparation method and applications thereof
  • Bismuth oxide photocatalyst, preparation method and applications thereof
  • Bismuth oxide photocatalyst, preparation method and applications thereof

Examples

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Effect test

Embodiment 1

[0019] Add 1 g of bismuth nitrate pentahydrate and 1.5 g of L-asparagine monohydrate into 50 mL of distilled water, stir and dissolve thoroughly, then transfer the mixed solution to a 150 mL round bottom flask, and fully react for 4 hours in an oil bath at 100°C ; After the reaction is cooled down to room temperature, the reactant obtained from the reaction is centrifuged and washed, and the precipitate is washed 3 times with deionized water and ethanol respectively to obtain a white solid, which is placed in an oven and dried at 60°C for 12 hours; then The white solid was thoroughly ground, placed in a ceramic crucible, and calcined at 340° C. for 2 hours using a muffle furnace to obtain a light yellow solid powder, which is the nanoflower-shaped β-phase bismuth oxide photocatalyst. The X-ray diffraction pattern and scanning electron microscope morphology of the nanoflower-like β-phase bismuth oxide photocatalyst are shown in Fig. figure 1 and figure 2 shown. This nano-flo...

Embodiment 2

[0021] Add 1 g of bismuth nitrate pentahydrate and 2.0 g of L-asparagine monohydrate into 50 mL of distilled water, stir to dissolve, then transfer the mixed solution to a 150 mL round bottom flask, and fully react in an oil bath at 120°C for 6 hours ; After the reaction is cooled to room temperature, the reactant obtained from the reaction is centrifuged and washed, and the precipitate is washed 3 times with deionized water and ethanol respectively to obtain a white solid, which is placed in an oven and dried at 60°C for 12 hours; then The white solid was thoroughly ground, placed in a ceramic crucible, and calcined at 380° C. for 2 hours using a muffle furnace to obtain a light yellow solid powder, which is the nanoflower-shaped β-phase bismuth oxide photocatalyst. The nano-flower-like β-phase bismuth oxide photocatalyst was treated according to the method in Application Example 1 below, and the results showed that the target pollutant p-hydroxybiphenyl could be completely de...

Embodiment 3

[0023] Add 2 grams of bismuth nitrate pentahydrate and 4.5 grams of L-asparagine monohydrate into 100 mL of distilled water, stir and dissolve, then transfer the mixed solution to a 250 mL round bottom flask, and fully react in an oil bath at 140°C for 8 hours ; After the reaction is cooled to room temperature, the reactant obtained from the reaction is centrifuged and washed, and the precipitate is washed 3 times with deionized water and ethanol respectively to obtain a white solid, which is placed in an oven and dried at 60°C for 12 hours; then The white solid was thoroughly ground, placed in a ceramic crucible, and calcined at 400° C. for 2 hours in a muffle furnace to obtain a light yellow solid powder, which is the nanoflower-shaped β-phase bismuth oxide photocatalyst. The nano-flower-like β-phase bismuth oxide photocatalyst was treated according to the method in Application Example 1 below, and the results showed that the target pollutant p-hydroxybiphenyl could be comple...

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Abstract

The invention discloses a bismuth oxide photocatalyst, a preparation method, and applications thereof. The preparation method comprises the following steps: dissolving bismuth-containing compounds and L-asparagine in water to obtain a uniform solution, then placing the solution in a space with a constant temperature of 80 to 160 DEG C for 4 to 8 hours, cooling, then washing and drying the precipitate, and finally burning the precipitate at a temperature of 320 to 440 DEG C for 1 to 4 hours to obtain the bismuth oxide photocatalyst. In the provided preparation method, the bismuth-containing compounds and L-asparagine carry out reactions at a low temperature under a normal pressure to generate a precursor, and after the burning, the precursor as a self-sacrificing template is degraded and converted into a nano flower-shaped beta-phase bismuth oxide visible-light photocatalyst. The nano flower-shaped beta-phase bismuth oxide has the advantages of higher uniformity, fine granularity, narrow particle size distribution, and certain morphology. The average particle size of the bismuth oxide grains is 50 nanometers, and the nano three-dimensional flower-shaped structure composed of the bismuth oxide grains has an average diameter of 300 to 600 nanometers. The bismuth oxide photocatalyst can be applied to catalytic degradation of organic pollutants, and can also be used in the fields such as optoelectronic equipment, industrial catalysts, and the like.

Description

Technical field: [0001] The invention belongs to the field of novel semiconductor photocatalytic materials, and in particular relates to a bismuth oxide photocatalyst and its preparation method and application. Background technique: [0002] Semiconductor photocatalysts can photocatalytically degrade organic pollutants under the irradiation of ultraviolet light or visible light, decompose them into small molecular compounds, and finally mineralize them to generate water and carbon dioxide; they have high efficiency, low cost, low energy consumption, and easy operation Therefore, it has been widely concerned and valued by experts and scholars in the fields of environment, materials, energy and so on. The commonly used photocatalyst is nano-titanium dioxide, but it has the disadvantages of low photon quantum efficiency, low solar energy utilization rate, and only responds in the ultraviolet region, which seriously restricts the large-scale application of photocatalytic technol...

Claims

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Application Information

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IPC IPC(8): B01J23/18C01G29/00
Inventor 肖信南俊民涂舜恒左晓希
Owner SOUTH CHINA NORMAL UNIVERSITY
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