Bismuth-based composite photocatalyst as well as preparation method and application thereof

A technology of composite light and catalyst, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low visible light capture efficiency and slow degradation of pollutants, and achieve superior degradation performance and simple process. , the effect of easy availability of raw materials

Pending Publication Date: 2022-07-22
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0004] In order to overcome the shortcomings of slow degradation of pollutants and low efficiency of visible light capture by photocatalysts in the prior art, the object of the present invention is to provide a bismuth-based composite photocatalyst and its preparation method and application. utilization and the efficiency of photocatalytic degradation of organic pollutants

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  • Bismuth-based composite photocatalyst as well as preparation method and application thereof
  • Bismuth-based composite photocatalyst as well as preparation method and application thereof
  • Bismuth-based composite photocatalyst as well as preparation method and application thereof

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preparation example Construction

[0060] The technical scheme adopted in the present invention is a preparation method of a sulfur-doped bismuth oxybromide / bismuth stannate composite photocatalyst, comprising the following steps:

[0061] (1) Bi 2 Sn 2 O 7 preparation

[0062] Synthesis of Bi by Hydrothermal Method 2 Sn 2 O 7 nanoparticles. SnCl 4 .5H 2 O and Bi (NO 3 ) 3 ·5H 2 Disperse O in deionized water, stir and mix evenly; the molar ratio of bismuth nitrate pentahydrate and tin tetrachloride pentahydrate is 1:1; use NaOH to adjust the pH value to 12, and wait for it to be dispersed evenly. Placed in a Teflon high pressure reactor, the temperature is 170 ~ 190 ℃, and the reaction is 20 ~ 26h. Wash 3-4 times with deionized water and absolute ethanol. After that, it was placed in a drying oven and dried at 60 °C for 24 h to obtain Bi 2 Sn 2 O 7 sample.

[0063] (2)S-BiOBr / Bi 2 Sn 2 O 7 Preparation of composite photocatalysts

[0064] Preparation of S-BiOBr / Bi by Hydrothermal Method 2 S...

Embodiment 1

[0069] Bi 2 Sn 2 O 7 The preparation of Bi was synthesized by hydrothermal method 2 Sn 2 O 7 Nanoparticles:

[0070] 0.005mol SnCl 4 .5H 2 O (1.442g) and 0.005mol Bi (NO 3 ) 3 ·5H 2 O (1.94 g) was dispersed into 25 mL of deionized water and stirred for 20 min. The two solutions were mixed and stirred for 30 min. Use 2mol L -1 The pH was adjusted to 12 with NaOH, and it was dispersed uniformly. It was placed in a Teflon autoclave, the temperature was 180°C, and the reaction was carried out for 24h. Wash 3-4 times with deionized water and absolute ethanol. After that, it was placed in a drying oven and dried at 60 °C for 24 h to obtain Bi 2 Sn 2 O 7 sample.

[0071] S-BiOBr / Bi 2 Sn 2 O 7 Preparation of composite photocatalysts,

[0072] Preparation of S-BiOBr / Bi by Hydrothermal Method 2 Sn 2 O 7 : 1 mmol Bi(NO 3 ) 3 ·5H 2 O and 0.01mmolBi 2 Sn 2 O 7 , dissolved in 5 mL of ethylene glycol solution, stirred for 20 min, and named solution A. To 30 mL...

Embodiment 2

[0074] Bi 2 Sn 2 O 7 The preparation of Bi was synthesized by hydrothermal method 2 Sn 2 O 7 Nanoparticles:

[0075] 0.005mol SnCl 4 .5H 2 O (1.442g) and 0.005mol Bi (NO 3 ) 3 ·5H 2 O (1.94 g) was dispersed into 25 mL of deionized water and stirred for 20 min. The two solutions were mixed and stirred for 30 min. Use 2mol L -1 The pH was adjusted to 12 with NaOH, and it was dispersed uniformly. It was placed in a Teflon autoclave, the temperature was 180°C, and the reaction was carried out for 24h. Wash 3-4 times with deionized water and absolute ethanol. After that, it was placed in a drying oven and dried at 60 °C for 24 h to obtain Bi 2 Sn 2 O 7 sample.

[0076] S-BiOBr / Bi 2 Sn 2 O 7 Preparation of composite photocatalysts,

[0077] Preparation of S-BiOBr / Bi by Hydrothermal Method 2 Sn 2 O 7 : 1 mmol Bi(NO 3 ) 3 ·5H 2 O and 16 mg (0.02 mmol) Bi 2 Sn 2 O 7 , dissolved in 5 mL of ethylene glycol solution, sonicated and added 1 mmol Bi(NO 3 ) 3 ...

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Abstract

The invention discloses a bismuth-based composite photocatalyst as well as a preparation method and application thereof, and belongs to the field of photocatalysis. The component of the photocatalyst is S-BiOBr/Bi2Sn2O7, thiourea is selected as a sulfur source to be doped with bismuth oxybromide, and then bismuth stannate prepared by taking bismuth nitrate pentahydrate and tin tetrachloride pentahydrate as a bismuth source and a tin source is modified. According to the preparation method, the S-doped BiOBr nanosheet is successfully prepared by adopting isomorphous substitution and hydrothermal method self-assembly, and then Bi2Sn2O7 is attached to the surface of the S-doped BiOBr nanosheet, so that the 3D/0D interface Z-type S-BiOBr/Bi2Sn2O7 heterojunction is constructed. The preparation method has the advantages of easily available raw materials, simple process, convenient operation, greenness and environmental protection, and the prepared photocatalyst has excellent degradation performance and good stability and can be recycled. The method can be widely applied to degradation of pollutants such as dyes, antibiotics and algae.

Description

technical field [0001] The invention belongs to the technical field of visible light catalyst materials, and particularly relates to a bismuth-based composite photocatalyst and a preparation method and application thereof. Background technique [0002] Today, while creating commodities, the manufacturing industry also generates a large amount of waste water, and the highly stable and harmful waste water cannot be biodegraded in the treatment plant, and finally enters the groundwater and marine resources. Wastewater can cause ecosystem pollution of groundwater and marine resources, and even endanger human health. Photocatalytic degradation is an efficient and green method to solve pollutants in wastewater, and it has become the focus of solving pollutants in wastewater because of its environmental friendliness and economical savings. [0003] Bismuth series as photocatalyst such as: BiVO 4 , Bi 2 WO 6 , Bi 2 O 3 , BiOX, etc.; as a class of bismuth oxides, Bi 2 Sn 2 O ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135B01J37/10C02F1/30C02F101/30
CPCB01J27/135B01J35/004B01J37/10C02F1/30C02F2101/30C02F2101/308C02F2305/10
Inventor 樊国栋周建锋阮方毅李瑛陈茜茜
Owner SHAANXI UNIV OF SCI & TECH
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