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Preparation method of green bismuth vanadate particles

A technology of green bismuth vanadate and particles, which is applied in the field of preparation of green bismuth vanadate particles, can solve the problems of BiVO4 instability of quantum dots and unfavorable composites, and achieve improved visible light response performance, high preparation efficiency, and enhanced visible light response Effect

Active Publication Date: 2021-06-15
BEIJING JIAOTONG UNIV
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  • Summary
  • 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

Examples

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Embodiment 1

[0033] The present embodiment provides a kind of preparation method of green bismuth vanadate particle, comprises the steps:

[0034] S11 takes yellow BiVO 4 The particles are preheated at a certain temperature, the preheating temperature is 200-300°C, which is used to remove the yellow BiVO attached 4 Impurities on the particle surface. The preheating treatment can be carried out in a muffle furnace. In order to ensure the cleanliness of the sample, it can also be processed in a tube furnace under the protection of an inert gas.

[0035] Among them, the yellow BiVO 4 The particle size of the particles is 5nm-1000nm.

[0036] S12 preheated the yellow BiVO 4 The particles are placed on a quartz glass substrate and subjected to tableting by covering the sheet glass;

[0037] S13 uses laser to treat the yellow BiVO covering sheet glass with a certain surface flatness (surface fluctuation error range is -0.1 ~ 0.1mm). 4 Carry out irradiation for 5-15s. After laser irradiati...

Embodiment 2

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

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

[0043] (2) The pretreated BiVO 4 On the quartz glass substrate, the sheeting process is carried out by covering the sheeting glass, and the surface fluctuation error range of the sample after sheeting is ensured to be -0.1-0.1mm.

[0044] (3) Using laser to cover the BiVO of sheet glass 4 The irradiation treatment was carried out for 8s, and the parameters of the laser were selected as follows: wavelength 1064nm; power 1W; pulse frequency 1000Hz. The pulse width of the laser is 8ns.

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

[0046] figure 1 For the green BiVO obtained by the method of ...

Embodiment 3

[0051] The present embodiment provides a kind of preparation method of green bismuth vanadate particle, comprises the steps:

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

[0053] (2) The pretreated BiVO 4 The tableting process is performed on the quartz glass substrate, and the surface fluctuation error range of the sample after the tableting is ensured to be -0.1-0.1mm.

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

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

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Abstract

The invention provides a preparation method of green bismuth vanadate particles. The method comprises the following steps: S11, taking yellow BiVO4 particles, and carrying out preheating treatment at a certain temperature so as to remove impurities attached to the surfaces of the yellow BiVO4 particles; S12, placing the yellow BiVO4 particles subjected to preheating treatment on a quartz glass substrate, and carrying out tabletting treatment by covering tabletting glass; S13, irradiating the yellow BiVO4 which reaches a certain surface flatness and covers the sheet pressing glass for a preset time by adopting laser; and S14, uniformly mixing the green BiVO4 sample obtained after irradiation again, and repeating steps S12 and S13 for multiple times until the sample powder is green and uniform. According to the green bismuth vanadate particles prepared by the method, while the visible light response performance of BiVO4 is improved, elements do not need to be introduced into a bulk phase for doping, so that the complete crystal structure of the bulk phase can be ensured, and the lattice distortion of BiVO4 is also avoided.

Description

technical field [0001] The invention relates to the technical field of material chemistry, in particular to a method for preparing 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 harmful to the 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 is also widely used in other aspects. It absorbs light energy and generates active photo-generated electrons and holes after being excited. These high-energy and 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 ambient air purification to decompose organic compounds and toxic substances in the air, such as benzene, formaldehyde, ammonia and TVOC, etc., to purify the air. As an exce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00B01J23/22B01J35/02B01J35/00
CPCC01G31/00B01J23/22C01P2006/60C01P2006/40C01P2002/72B01J35/50B01J35/33B01J35/39
Inventor 王达吴瑞张子慧徐宁奕
Owner BEIJING JIAOTONG UNIV
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