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Preparation method and application of BiOCl nano photocatalyst with high visible light catalytic activity

A catalytic activity, photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low visible light catalytic activity, complex preparation process, and high safety hazards, and achieve good light. The effect of catalytic degradation efficiency, simple preparation process and high safety

Pending Publication Date: 2021-11-16
JILIN JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a preparation method for rapidly synthesizing BiOCl photocatalyst at room temperature, which not only has a simple synthesis process, is easy to operate, does not use any organic solvents and special equipment (such as autoclaves), and is environmentally friendly and safe. High stability, and the synthesized BiOCl nanophotocatalyst is highly dispersed nanosheets or nanoflowers assembled by nanosheets, even under the action of LED light strip (32W), the catalyst shows outstanding visible light catalytic activity , and has high adsorption, solving the problems of low visible light catalytic activity of BiOCl products in the prior art, complicated preparation process, large safety hazards, environmental protection, high energy consumption, etc.

Method used

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  • Preparation method and application of BiOCl nano photocatalyst with high visible light catalytic activity
  • Preparation method and application of BiOCl nano photocatalyst with high visible light catalytic activity
  • Preparation method and application of BiOCl nano photocatalyst with high visible light catalytic activity

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preparation example Construction

[0032] A preparation method of a BiOCl nano photocatalyst with high visible light catalytic activity, comprising the steps of:

[0033] S1. Dissolve a certain amount of polyethylene glycol in deionized water, then add water-soluble bismuth salt or its hydrate, and stir thoroughly;

[0034] S2, adding a certain amount of water-soluble chloride salt into the above solution, fully stirring at room temperature;

[0035] S3, separating the generated precipitate, washing and drying to obtain BiOCl nano photocatalyst powder.

[0036] Preferably, in S1, the molecular weight of polyethylene glycol is 200-10000.

[0037] Preferably, in S1, the water-soluble bismuth salt is bismuth nitrate pentahydrate Bi(NO 3 ) 3 "5H 2 O or bismuth chloride.

[0038] Preferably, the stirring in S1 is stirring at room temperature for 30-60 min.

[0039] Preferably, in S1, the molar ratio of polyethylene glycol to bismuth nitrate pentahydrate is 0.01-4:1, specifically, when the molecular weight of pol...

Embodiment 1

[0056] Dissolve 1 mmol of polyethylene glycol 2000 in 40 mL of deionized water, then add 2 mmol of bismuth nitrate pentahydrate, stir at room temperature for 30 min, add 2 mmol of potassium chloride, and stir for 40 min. The precipitate was separated by centrifugation, washed with deionized water until neutral, and dried in a vacuum oven at 40°C for 12 hours to obtain BiOCl powder.

[0057] The research on the photocatalytic performance of the sample prepared in Example 1 shows that after dark adsorption for 60 min, the adsorption degradation rate is 54%, and then irradiated with an LED lamp (32W), the degradation rate is 98% in 10 min, and 100% in 15 min.

Embodiment 2

[0067] Dissolve 0.1 mmol of polyethylene glycol 2000 in 40 mL of deionized water, then add 1 mmol of bismuth nitrate pentahydrate, stir at room temperature for 30 min, add 1 mmol of potassium chloride, and stir for 40 min. The precipitate was separated by centrifugation, washed with deionized water until neutral, and dried in a vacuum oven at 40°C for 12 hours to obtain BiOCl powder.

[0068] The research on the photocatalytic performance of the sample prepared in Example 2 shows that after dark adsorption for 60min, the adsorption degradation rate is 40%, and then irradiated with an LED lamp (32W), the degradation rate is 74% in 10min, 81% in 15min, and 81% in 20min. The rate is 92%.

[0069] Adopt the scanning electron microscope to carry out the microscopic morphology characterization of embodiment 2 sample, as Figure 4 as shown in a. It can be seen that the BiOCl sample prepared in Example 2 mainly presents the morphology of nanosheets, the dispersion of nanosheets is g...

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Abstract

The invention relates to the technical field of photocatalysts, and particularly provides a method which is simple, easy to operate and capable of quickly synthesizing a BiOCl photocatalyst with high visible light catalytic activity at room temperature without using any organic solvent and special equipment. The method comprises the following steps: S1, dissolving a certain amount of polyethylene glycol in deionized water, adding water-soluble bismuth salt or hydrate thereof, and fully stirring; s2, adding a certain amount of water-soluble chlorine salt into the solution, and fully stirring at room temperature; and S3, separating the generated precipitate, washing, and drying to obtain BiOCl nano photocatalyst powder. The microstructure of the BiOCl nano photocatalyst synthesized by the method disclosed by the invention is a high-dispersity nanosheet or a nanoflower assembled by the nanosheet, and the catalyst shows outstanding visible light catalytic activity under an LED (Light Emitting Diode) lamp strip; the problems of low visible light catalytic activity, complex preparation process, large potential safety hazard, no environmental protection, high energy consumption and the like of the product in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of photocatalysts, in particular to a preparation method of a BiOCl nanometer photocatalyst with high visible light catalytic activity. Background technique [0002] It has been reported in the prior art that bismuth oxychloride (BiOCl) can be used as a photocatalyst or electrode material. As an inorganic material photocatalyst, the inorganic material is prepared by different preparation methods, and different microscopic shapes can be obtained, and different microscopic shapes determine its different catalytic performance and catalytic ability. [0003] For example, the invention patent CN 110240197 A discloses a multi-layered BiOCl microsphere self-assembled by ultra-thin nanosheets and its application in photocatalytic coupling of benzylamine to imine. The scheme uses bismuth nitrate pentahydrate and potassium chloride as raw materials, ethylene glycol as solvent, and surfactant PVPK30, and is prepared b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06B01J35/08C02F1/30C02F101/34C02F101/36C02F101/38
CPCB01J27/06C02F1/30C02F2305/10C02F2101/308C02F2101/34C02F2101/36C02F2101/38B01J35/23B01J35/51B01J35/39Y02W10/37
Inventor 王立艳盖广清
Owner JILIN JIANZHU UNIVERSITY
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