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Visible-light-driven photocatalyst C@Bi2O3-BiOBr-BiOI as well as preparation method and application thereof in sterilization

A technology of visible light and catalyst, applied in the field of preparation of visible light catalyst, can solve the problems of unsatisfactory sterilization effect and long absorption wavelength, and achieve excellent sterilization ability and energy saving effect

Active Publication Date: 2016-12-07
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The band gap of bismuth oxide is 2.6-2.8eV, the absorption wavelength is longer, and it has a certain utilization rate for visible light, but its effect in the field of sterilization is not ideal

Method used

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  • Visible-light-driven photocatalyst C@Bi2O3-BiOBr-BiOI as well as preparation method and application thereof in sterilization
  • Visible-light-driven photocatalyst C@Bi2O3-BiOBr-BiOI as well as preparation method and application thereof in sterilization
  • Visible-light-driven photocatalyst C@Bi2O3-BiOBr-BiOI as well as preparation method and application thereof in sterilization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] (1) Preparation method of carbon nanospheres:

[0067] Dissolve 6 g of glucose in 60 mL of deionized water, conduct a hydrothermal reaction at 180°C for 24 hours, wash with distilled water and absolute ethanol three times, and dry at 80°C to obtain carbon nanospheres.

[0068] (2) C@Bi 2 o 3 The preparation method:

[0069] (1) 0.97g Bi(NO 3 ) 3 ·5H 2 O was stirred and dissolved in 17 mL of ethylene glycol solution, dispersed with 34 mL of absolute ethanol, added 72 mg of nano-carbon spheres, stirred vigorously for 40 min, and ultrasonically dispersed for 40 min, transferred the mixed solution to a polytetrafluoroethylene reactor, and heated it with water at 200 °C Reaction 10h;

[0070] (2) After cooling to room temperature, centrifuge, wash with water and ethanol three times, and dry in vacuum at 60°C for 3 hours to obtain C@Bi 2 o 3 .

[0071] (3) C@Bi 2 o 3 - Preparation method of BiOBr:

[0072] (1) 0.97g Bi(NO 3 ) 3 ·5H 2 O was stirred and dissolved...

Embodiment 2

[0082] The photocatalyst C@Bi prepared in Example 1 2 o 3 、C@Bi 2 o 3 -BiOBr, C@Bi 2 o 3 -BiOI, C@Bi 2 o 3 -BiOBr-BiOI for UV-Vis diffuse reflectance scanning, get UV-vis-DRS contrast figure 1 .

[0083] Such as figure 1 , as can be seen from the figure, C@Bi 2 o 3 It has different degrees of absorption of ultraviolet light and visible light; C@Bi 2 o 3 -BiOBr has increased absorption in the visible region; C@Bi 2 o 3 -BiOI compared to C@Bi 2 o 3 , in a wide range of wavelengths, the absorption of light has increased; C@Bi 2 o 3 -BiOBr-BiOI has a large increase in the absorption of light in the visible light region, which is conducive to the increase of the visible light activity of the catalyst.

Embodiment 3

[0085] Adding C@Bi to the aqueous solution of Escherichia coli 2 o 3 -BiOBr-BiOI, irradiated with visible light for 3 hours, and incubated at room temperature and 100r / min for 1 hour with constant temperature shaking to obtain a bacterial suspension. Dilute the obtained bacterial suspension in sequence, and take 50 μL of the diluted solution and spread it on the agarose medium. , continue to cultivate in a constant temperature incubator for 24 hours, the temperature in the constant temperature incubator is 37°C, take out and count after the culture is over.

[0086] Change the photocatalyst to the photocatalyst C@Bi prepared in Example 1 2 o 3 、C@Bi 2 o 3 -BiOBr, C@Bi 2 o 3 -BiOI, C@Bi 2 o 3 -BiOBr-BiOI, while setting the control group without adding any catalyst, the results are shown in Figure 2(a). In addition, in order to eliminate the bactericidal effect of the photocatalyst itself under dark conditions, and to determine the bactericidal effect of light on the ph...

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Abstract

The invention discloses a visible-light-driven photocatalyst C@Bi2O3-BiOBr-BiOI as well as a preparation method and an application thereof in sterilization. The preparation method of the catalyst comprises the following steps: (1) preparing nano carbon spheres by using glucose through a hydro-thermal reaction method; (2) stirring and dissolving Bi(NO3)3.5H2O in a glycol solution, performing dispersion by using anhydrous ethanol, adding the nano carbon spheres, stirring the mixture severely, performing ultrasonic dispersion, transferring the mixed solution into a polytetrafluoroethylene reaction kettle, and performing a hydro-thermal reaction for a period of time; and (3) cooling the mixture to a room temperature, adding cetyl trimethyl ammonium bromide (CTAB) and KI, adjusting the pH value, performing stirring continuously, performing centrifugal separation, then performing washing by using water and ethanol for a plurality of times, and then performing vacuum drying to obtain the C@Bi2O3-BiOBr-BiOI. The photocatalyst disclosed by the invention is low in preparation cost, makes use of visible light, saves energy sources, and has an excellent sterilization ability.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to the technical field of visible light catalytic materials, in particular to a preparation method of a visible light catalyst and its application in sterilization. Background technique [0002] Photocatalyst technology is an advanced oxidation technology, which has the characteristics of high efficiency and environmental protection, and can be applied to many aspects such as organic and heavy metal wastewater treatment and sterilization. Photocatalysts can generate photogenerated electron-hole pairs under light irradiation. The holes have strong oxidizing properties and can kill bacteria, thereby achieving the purpose of sterilization. However, most photocatalysts have problems such as being only excited by ultraviolet light and having weak bactericidal effects. Therefore, it is necessary to prepare a photocatalyst with high visible light response. [0003] The b...

Claims

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Application Information

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IPC IPC(8): B01J27/186A01N59/16A01P1/00C02F1/30C02F1/50
CPCA01N59/16C02F1/30C02F1/50B01J27/186C02F2305/10B01J35/39
Inventor 王齐刘恩秦石晓东张晨露胡含蕾周甜甜刘研秋
Owner ZHEJIANG GONGSHANG UNIVERSITY
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