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A bismuth-loaded bismuth vanadate porous nanofiber and preparation method thereof

A nanofiber and porous fiber technology, applied in fiber processing, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of degradation efficiency and solar light utilization still to be improved, quantum efficiency and photocatalytic efficiency are not high, electronic- Holes are easy to recombine and other problems, so as to improve the utilization efficiency of visible light, the preparation process is clear, and the application field of photocatalysis can be expanded.

Active Publication Date: 2019-11-05
ANHUI SCI & TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional photocatalysts such as TiO 2 and ZnO, there are still insurmountable problems: on the one hand, the photogenerated electron migration rate is low, and electron-holes are easy to recombine, resulting in low quantum efficiency and photocatalytic efficiency; on the other hand, the photoresponse range is too narrow and relies too much on ultraviolet Light (UV) excitation
Although there are many methods, there are still some shortcomings. The degradation efficiency of pollutants and the utilization rate of sunlight of the currently obtained bismuth vanadate composite materials still need to be improved.

Method used

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  • A bismuth-loaded bismuth vanadate porous nanofiber and preparation method thereof
  • A bismuth-loaded bismuth vanadate porous nanofiber and preparation method thereof
  • A bismuth-loaded bismuth vanadate porous nanofiber and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation of bismuth vanadate-based porous nanofibers is carried out as follows:

[0039] (1) Weigh 1.21g of bismuth nitrate pentahydrate, 0.65g of polyvinylpyrrolidone, 0.662g of vanadyl acetylacetonate, and 2.5g of citric acid and add them to 2.5g of N,N-dimethylformamide and 2g of glacial acetic acid. , ethanol 2g was stirred and dissolved, the solution was placed in a three-necked flask, protected by a nitrogen atmosphere, stirred at 25°C for 12 hours, and the stirring speed was 800 rpm to obtain a uniformly mixed sol precursor.

[0040] (2) Take 10ml of the sol precursor liquid one by one and put it in the high-voltage electrostatic molding equipment, use the high-voltage electrostatic molding technology to synthesize, adjust the sol extrusion molding port to 0.5mm, set the high-voltage static electricity to 15KV, and the temperature to 60°C. Sol fibers were obtained; the collected fibers were placed in an oven at 70°C and dried for 40 minutes; finally, the fib...

Embodiment 2

[0043] The photocatalytic performance test of the material that embodiment 1 makes:

[0044] Prepare 50 ml of methylene blue (MB) aqueous solution with a concentration of 10 mg / L and place it in a 100 ml beaker, then add 0.1 g of the photocatalyst prepared in Example 1, and ultrasonicate for 30 s to fully dissolve the photocatalyst. Before the light experiment, the beaker was covered with a shading cloth and magnetically stirred for 30 min in the dark, so that the adsorption and desorption of the catalyst to the dye MB reached equilibrium. Then keep the room dark, remove the shading cloth, use a 500 W xenon lamp with a 420 nm filter installed at the port as a visible light source, and keep the light port at a distance of 10 cm from the beaker, so that the light spot is vertical and completely illuminates the solution in the beaker At this time, it is used as the zero point of the experiment for timing. At intervals of 20 minutes each time, 4 ml of the solution was sucked out ...

Embodiment 3

[0047] A preparation of bismuth vanadate-based porous nanofibers is carried out as follows:

[0048] (1) Preparation of precursor solution

[0049] Dissolve bismuth nitrate pentahydrate, vanadyl acetylacetonate, citric acid, and polyvinylpyrrolidone in a mixed solution of N,N-dimethylformamide, glacial acetic acid, and ethanol, place the solution in a three-necked flask, and pass it into a nitrogen atmosphere for protection. Stirring at 25°C for 6 hours at a stirring speed of 1000 rpm to obtain a uniformly mixed sol precursor; the bismuth nitrate pentahydrate: N,N-dimethylformamide: vanadyl acetylacetonate: polyvinylpyrrolidone: lemon Acid: glacial acetic acid: ethanol=10.4%: 5.7%: 5.7%: 21.7%: 17.4%: 17.4%: 21.7%, in mass percentage;

[0050] (2), preparation of bismuth vanadate porous fiber

[0051] The sol precursor solution prepared in step 1 was formed by high-voltage electrostatic molding, and the forming port was adjusted to 0.5mm to extrude the sol. The high-voltage ...

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Abstract

A bismuth vanadate-based porous nanofiber is characterized in that: the porous nanofiber is composed of bismuth vanadate and amorphous bismuth, and the amorphous bismuth is loaded on bismuth vanadate, and the mass percentage of the bismuth vanadate is It is about 95%-98%, and the mass percentage of the amorphous bismuth is 2%-5%. Its preparation method, it uses bismuth nitrate pentahydrate, N,N-dimethylformamide, vanadyl acetylacetonate, polyvinylpyrrolidone, citric acid, glacial acetic acid, ethanol as raw materials, through high-voltage electrostatic forming technology, muffle furnace Sintering, hydrogen plasma treatment and other steps to achieve. The raw material of the present invention is simple and easy to obtain, the whole experimental process is clear, the operation is convenient, it is easy to realize the large-scale production of the product, and the product can be 100% recovered in the use process, and the obtained amorphous bismuth vanadate porous nanofiber composite material has Excellent flexibility, the macroscopic size can reach tens of centimeters, the microstructure of the product is uniform, and it has a good effect on photocatalytic degradation of dyes. In addition, the material is also expected to have good applications in flexible batteries, flexible photoelectric hydrogen production, etc.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to the field of bismuth vanadate nanofiber material and its preparation. Background technique [0002] With the rapid expansion of population and the rapid development of industry, water environmental pollution has become an important issue affecting human production and life. Governments around the world have listed water environmental pollution control as one of the top priorities at this stage and in the next few years. Especially in the printing and dyeing industry, the massive discharge of a large number of water-soluble azo dyes such as methyl orange, methylene blue, and nitrobenzene has caused a sharp deterioration in water quality. These azo pollutants are usually difficult to degrade by biological methods. Therefore, once they enter the water body, they are difficult to degrade through the natural degradation process, and they are very harmful to the water envi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08D06M10/02
CPCD01F9/08D06M10/025B01J37/349B01J23/22B01J35/004B01J35/06B01J35/10
Inventor 魏居孟贾先军刘纯荣刘领
Owner ANHUI SCI & TECH UNIV
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