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Novel nano-catalyst with visible light response as well as preparation method and application thereof

A nano-catalyst and visible light technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as low utilization rate of solar energy

Pending Publication Date: 2021-05-04
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This application provides a novel nano-catalyst that responds to visible light and its preparation method and application to solve the problem that BiOCl can only absorb and utilize ultraviolet light and the utilization rate of solar energy is low

Method used

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  • Novel nano-catalyst with visible light response as well as preparation method and application thereof
  • Novel nano-catalyst with visible light response as well as preparation method and application thereof
  • Novel nano-catalyst with visible light response as well as preparation method and application thereof

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preparation example Construction

[0032] In a second aspect, the application provides a method for preparing a novel nanocatalyst responding to visible light, which specifically includes the following steps:

[0033] (1) Dissolve citric acid and urea with a mass ratio of (2-3):1 in deionized water, transfer to an autoclave at 160°C-180°C for 6h-10h, cool to room temperature, and react The product is centrifuged to take the supernatant, and further vacuum freeze-dried to prepare CDs; wherein, the heating rate during the calcination process is 3° C. / min to 5° C. / min.

[0034] (2) KCl and Bi(NO 3 ) 3 ·5H 2 O was dissolved in glycerol or ethylene glycol, respectively, and then the KCl solution was slowly added to the Bi(NO 3 ) 3 ·5H 2 In the O solution, stir constantly to ensure thorough mixing, then transfer the mixture to an autoclave, and conduct a hydrothermal reaction at 160°C to 180°C for 15h to 18h; after cooling to room temperature, the reaction product is subjected to centrifugal washing treatment, a...

Embodiment 1

[0047] Step 1: Accurately weigh 3.0 g of citric acid and 1.0 g of urea and dissolve them in 20 ml of deionized water, then transfer the above solution to an autoclave, and react at 180°C for 8 hours. After cooling to room temperature, the mixture was transferred to a centrifuge tube, centrifuged at high speed for 30 min, and the supernatant was freeze-dried to obtain CDs powder;

[0048] Step 2, accurately weigh 2mmol of Bi(NO 3 ) 3 ·5H 2 O and 2mmol KCl were dissolved in 30ml of glycerol, and ultrasonically stirred until the reactants were completely dissolved, then the two were mixed and stirred to obtain a white suspension. Then the white suspension was transferred to a 100 mL autoclave and reacted at 160° C. for 16 hours. After cooling to room temperature, it was centrifuged and washed several times with absolute ethanol and deionized water, and the obtained precipitate was dried at 60 °C to obtain BiO 1-x Cl.

[0049] Step 3, accurately weigh 25mg of CDs powder obtai...

Embodiment 2

[0051] Step 1: Accurately weigh 3.0 g of citric acid and 1.0 g of urea and dissolve them in 20 ml of deionized water, then transfer the above solution to an autoclave, and react at 180°C for 8 hours. After cooling to room temperature, the mixture was transferred to a centrifuge tube, centrifuged at high speed for 30 min, and the supernatant was freeze-dried to obtain CDs powder;

[0052] Step 2, accurately weigh 2mmol of Bi(NO 3 ) 3 ·5H 2 O and 2mmol KCl were dissolved in 30ml of glycerol, and ultrasonically stirred until the reactants were completely dissolved, then the two were mixed and stirred to obtain a white suspension. Then the white suspension was transferred to a 100 mL autoclave and reacted at 160° C. for 16 hours. After cooling to room temperature, it was centrifuged and washed several times with absolute ethanol and deionized water, and the obtained precipitate was dried at 60 °C to obtain BiO 1-x Cl.

[0053] Step 3, accurately weigh 5mg of CDs powder obtain...

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Abstract

The invention provides a novel nano-catalyst with visible light response as well as a preparation method and application thereof, and relates to the technical field of preparation of photocatalysts and photocatalysis-advanced oxidation water treatment. The invention provides a novel nano-catalyst, a base of a flower-shaped CDs-BiO(1-x)Cl microsphere is a flower-shaped BiO(1-x)Cl microsphere, CDs nanocrystalline is tightly loaded on the surface of the flower-shaped BiO(1-x)Cl microsphere, and the flower-shaped BiO(1-x)Cl microsphere is formed by self-assembly of nano-plates, wherein BiO(1-x)Cl has oxygen vacancies, x is a deleted oxygen atom in the formula, and 1-x represents the left oxygen vacancies. According to the preparation method disclosed by the invention, oxygen vacancies are manufactured in BiOCl, and CDs are further introduced, so that the forbidden bandwidth of BiOCl is reduced and the light absorption range of BiOCl is expanded under the combined action of the CDs and the oxygen vacancies, visible light is effectively absorbed by CDs-BiO(1-x)Cl, and the solar energy utilization rate of the CDS-BiO(1-x)Cl catalyst is improved; and in addition, due to the unique electron transfer capability of the carbon quantum dots, the photo-induced electron-hole separation efficiency of the CDs-BiO(1-x)Cl is improved, and the photocatalytic performance of the CDs-BiO(1-x)Cl is further improved.

Description

technical field [0001] The invention relates to the technical fields of photocatalyst preparation and photocatalysis-advanced oxidation water treatment, and more specifically, relates to a novel nanocatalyst responding to visible light and its preparation method and application. Background technique [0002] The problem of water pollution in today's society is becoming more and more serious, especially a series of problems caused by organic pollutants. Organic pollutants in the water environment mainly include polyheterocyclic organic compounds, polycyclic aromatic hydrocarbons, polychlorinated biphenyls, synthetic detergents, and synthetic dyes. , synthetic pesticides and other types. Because there are many difficult problems in the traditional treatment method, its treatment effect and economic benefits are greatly reduced, so people's attention is turned to a more efficient and clean photocatalyst. As an advanced oxidation treatment technology, photocatalytic degradation...

Claims

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Application Information

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IPC IPC(8): B01J27/06C02F1/30C02F101/34C02F101/30
CPCB01J27/06C02F1/30C02F2305/10C02F2101/345C02F2101/30B01J35/39
Inventor 杨磊雷倩钟丹
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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