Preparation method of green bismuth vanadate particles

A technology of green bismuth vanadate and particles is applied in the field of preparation of green bismuth vanadate particles, which can solve the problems of unstable BiVO4 of quantum dots and unfavorable complexes, and achieves improved visible light response performance, high preparation efficiency, and suppression of surface defects. Effect

Active Publication Date: 2022-07-01
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that although these methods can guarantee BiVO 4 The integrity of the crystal structure, but it is heavily dependent on the light absorption properties of the compound semiconductor, and the compound semiconductor in BiVO 4 The distribution and state of the surface will affect the light absorption performance of the whole system, and the BiVO of quantum dots 4 extremely unstable, which for BiVO 4 The practical application of the complex is unfavorable

Method used

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  • Preparation method of green bismuth vanadate particles
  • Preparation method of green bismuth vanadate particles
  • Preparation method of green bismuth vanadate particles

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Embodiment 1

[0033] The present embodiment provides a preparation method of green bismuth vanadate particles, comprising the following steps:

[0034] S11 Take Yellow BiVO 4 The particles are preheated at a certain temperature, the preheating temperature is 200-300 °C, to remove the yellow BiVO 4 Impurities on the particle surface. Preheating can be carried out in a muffle furnace, or in a tube furnace under the protection of inert gas to ensure the cleanliness of the sample.

[0035] Among them, the yellow BiVO 4 The particle size of the particles ranges from 5 nm to 1000 nm.

[0036] S12 will preheat the yellow BiVO 4 The particles are placed on a quartz glass substrate and pressed by covering the pressing glass;

[0037] S13 uses a laser to align the yellow BiVO covered with laminated glass that reaches a certain surface flatness (surface fluctuation error range is -0.1 ~ 0.1mm). 4 Irradiate for 5-15s. The color of the glass changes from transparent to non-transparent after laser...

Embodiment 2

[0041] A preparation method of green bismuth vanadate particles, the steps are as follows:

[0042] (1) The yellow monoclinic BiVO 4 The particles (particle size 200 nm) were preheated in a muffle furnace at 200° C. to clean their surfaces.

[0043] (2) The preprocessed BiVO 4 Pressing is performed on the quartz glass substrate by covering the pressing glass, and the surface fluctuation error range of the sample after pressing is guaranteed to be within -0.1 to 0.1 mm.

[0044] (3) BiVO covered with laminated glass by laser 4 The irradiation treatment was performed for 8s, and the parameters of the laser were selected as: wavelength 1064nm; power 1W; pulse frequency 1000Hz. The pulse width of the laser is 8 ns.

[0045] (4) BiVO after one irradiation in (3) 4 The particles were re-mixed uniformly, and steps (2) and (3) were repeated for a total of 6 times to obtain green uniform BiVO 4 particles.

[0046] figure 1 Green BiVO obtained by the method of this example 4 Th...

Embodiment 3

[0051] The present embodiment provides a preparation method of green bismuth vanadate particles, comprising the following steps:

[0052] (1) The yellow monoclinic BiVO 4 The particles (particle size 200 nm) were preheated in a muffle furnace at 200° C. to clean their surfaces.

[0053] (2) The preprocessed BiVO 4 Compression is performed on a quartz glass substrate, and the surface fluctuation error range of the sample after compression is guaranteed to be within -0.1 to 0.1 mm.

[0054] (3) BiVO using laser 4 The irradiation treatment was performed for 8s, and the parameters of the laser were selected as: wavelength 532nm; power 1W; frequency 1000Hz. The pulse width of the laser is 8 ns.

[0055] (4) BiVO after one irradiation in (3) 4 The particles were re-mixed uniformly, and steps (2) and (3) were repeated for a total of 6 times to obtain green uniform BiVO 4 particles.

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Abstract

The invention provides a preparation method of green bismuth vanadate particles, comprising: S11 taking yellow BiVO 4 The particles are preheated at a certain temperature to remove the yellow BiVO attached to the 4 Impurities on the particle surface; S12 will preheat the yellow BiVO 4 The particles are placed on a quartz glass substrate and subjected to compression treatment by covering the compression glass; S13 uses a laser to compress the yellow BiVO covered by the compression glass with a certain surface flatness 4 Irradiate for a predetermined time; S14 pairs the green BiVO obtained after irradiation 4 After the sample is re-mixed uniformly, steps S12 and S13 are repeated several times until the sample powder is uniform in green. The green bismuth vanadate particles prepared by this method can improve BiVO 4 At the same time of visible light response performance, there is no need to introduce elements for doping in the bulk phase, which not only ensures the complete crystal structure of the bulk phase, but also avoids BiVO 4 Lattice distortion.

Description

technical field [0001] The invention relates to the technical field of material chemistry, in particular to a preparation method of green bismuth vanadate particles. Background technique [0002] Bismuth Vanadate (BiVO 4 ) is a widely used bright yellow inorganic chemical pigment. Because it does not contain heavy metal elements that are harmful to human body, it is a new generation of environmentally friendly low-carbon metal oxide materials. BiVO 4 In addition to its properties as a colorant, it also has a wide range of applications in other aspects. After it absorbs light energy, it will generate active photo-generated electrons and holes. These high-energy active photo-generated electrons and holes can kill bacteria such as Escherichia coli and Staphylococcus aureus. In addition, BiVO 4 It is also used in environmental air purification to decompose organic compounds and toxic substances in the air, such as benzene, formaldehyde, ammonia and TVOC, etc., to purify the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/00B01J23/22B01J35/02
CPCC01G31/00B01J23/22B01J35/026B01J35/004B01J35/0033C01P2006/60C01P2006/40C01P2002/72
Inventor 王达吴瑞张子慧徐宁奕
Owner BEIJING JIAOTONG UNIV
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