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Photocatalyst, preparation method and application thereof

A photocatalyst and solvent technology, applied in the field of photocatalysis and nanomaterials, can solve the problems of poor oxygen atmosphere stability and thermal stability, achieve good photothermal conversion effect, improve catalytic ability, and ensure long-term stability Effect

Pending Publication Date: 2019-09-03
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Liqun Ye (Liqun Ye, Xiaoli Jin, Yumin Leng, et al. Synthesis of blackultrathin BiOCl nanosheets for efficient photocatalytic H2production invisible light irradiation, Journal of Power Sources, 2015, 293: 409-415) discloses a nanosheet with good visible light Catalytically active black BiOCl material, but its oxygen atmosphere stability and thermal stability are poor

Method used

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  • Photocatalyst, preparation method and application thereof
  • Photocatalyst, preparation method and application thereof
  • Photocatalyst, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1 black BiOCl photocatalyst sample 1 # ~15 # preparation of

[0052] sample 1 # preparation of

[0053] 486mg of Bi(NO 3 ) 3 ·5H 2O was dissolved in 20 mL of diethylene glycol (DEG), then 455 mg of BiCl was added 3 , to obtain a mixed solution. Subsequently, the above mixed solution was transferred to a reactor for solvothermal reaction for 15 h at a reaction temperature of 150 °C. After the reaction, cool to room temperature, collect the precipitate, and wash with ethanol and deionized water. Finally, the product was dried at 80° C. for 6 hours to obtain an intermediate powder sample. Disperse 100 μg of the powder sample obtained above into 20 mL of a sodium citrate aqueous solution with a concentration of 50 mg / mL, light-treat it under a UV lamp for 3 h, remove the supernatant, collect the black BiOCl photocatalyst precipitate, and wash it with deionized water , followed by drying, the product black BiOCl photocatalyst can be obtained, denoted a...

Embodiment 2

[0087] Example 2 Sample 1 # ~15 # TEM characterization and XRD characterization

[0088] respectively for sample 1 # ~15 # Perform TEM and XRD characterizations. The results showed that sample 1 # ~15 # The particle size range of most samples is distributed in the range of 1-200nm, and the particle size range of most samples is distributed in the range of 20nm-100nm, and concentrated in the range of 20nm-80nm; the samples show regular or irregular lamellar morphology.

[0089] Take sample 1 # is a typical representative, and its TEM photos are as follows figure 1 As shown, the XRD pattern is as Image 6 shown. Depend on figure 1 It can be seen that the black BiOCl photocatalyst prepared by the method described in this application is a sheet material with a size distribution of 1-200nm, concentrated at 20nm-80nm, and a uniform particle size distribution. Depend on Image 6 The sample size converted from the XRD characterization results is consistent with the TEM cha...

Embodiment 3

[0091] Example 3 Sample 1 # ~15 # UV-Vis Absorption Spectroscopy Analysis

[0092] Inspect sample 1 separately # ~15 # The UV-Vis absorption spectrum was analyzed. The results showed that sample 1 # ~15 # In the wavelength range of 200-900nm, the absorbance is between 0.36-0.46. Typical representatives such as sample 1 # , its UV-Vis absorption spectrum as figure 2 shown.

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Abstract

The application discloses a photocatalyst, a preparation method and application thereof. The photocatalyst comprises citric acid and bismuth oxyhalide, the citric acid is modified on the surface of the bismuth oxyhalide. The chemical formula of the bismuth oxyhalide is BiOX; X is selected from at least one of F, Cl, Br, I and At. The color of the photocatalyst is black. The energy band structure of the photocatalyst has stable oxygen vacancy energy levels between a conduction band and a valence band, so that the photocatalyst has wide spectrum absorption extending to a visible light range, thereby obviously improving the photocatalytic performance and having certain oxidation resistance, thus being capable of maintaining black stability in an oxygen atmosphere environment and a thermal heating environment and ensuring long-period stability of high-efficiency visible photocatalytic performance.

Description

technical field [0001] The application relates to a black BiOX photocatalyst, a preparation method and its application in photocatalytic environmental treatment, photothermal conversion devices, etc., and belongs to the field of nanomaterials and photocatalysis. Background technique [0002] With the development of modern industry and agriculture and the improvement of people's living standards, more and more organic pollutants such as industrial waste, domestic garbage, residual pesticides and chemical fertilizers enter the water bodies on which human beings live through various channels, and photocatalytic The degradation technology provides a green and reliable way to solve the problem of organic pollutants, among which semiconductor photocatalyst is the key link in the photocatalytic degradation technology. [0003] BiOX (X=F, Cl, Br, I, At) is a new type of layered semiconductor compound. BiOX with flake, curd and mesoporous structure shows good photocatalytic performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06B01J31/04B01J37/10B01J37/34A61K49/22A61K49/04A61K41/00C02F1/30C02F101/36C02F101/38
CPCB01J27/06B01J31/04B01J37/10B01J37/345C02F1/30A61K49/22A61K49/04A61K41/0057C02F2305/10C02F2101/308C02F2101/36C02F2101/38C02F2101/40B01J35/39B01J35/23
Inventor 吴爱国徐裕
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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