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BiOI/BiOBr multilevel structure composite visible light catalyst, and preparation method and application thereof

A visible light and catalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low quantum yield, achieve good dispersion, improve performance, and produce stable products.

Inactive Publication Date: 2012-09-19
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since conventional TiO 2 The quantum yield is low and it can only be excited by ultraviolet light to generate electron-hole pairs. Therefore, it is an inevitable development trend in the field of photocatalysis to seek high-performance visible light catalysts that can effectively utilize solar energy.

Method used

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  • BiOI/BiOBr multilevel structure composite visible light catalyst, and preparation method and application thereof
  • BiOI/BiOBr multilevel structure composite visible light catalyst, and preparation method and application thereof
  • BiOI/BiOBr multilevel structure composite visible light catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Put 0.45mmolNaI, 0.1g citric acid, and 0.1g cetyltrimethylammonium bromide in 200mL distilled water: ethanol: ethylene glycol in a mixed solvent with a volume ratio of 100:30:70, stir and dissolve into a transparent solution, Then heated to 60°C, and 3mL of 0.15mol / L Bi(NO 3 ) 3 Aqueous solution (0.45mmol), stirred at constant temperature for 1h, 3mL of 0.15mol / L NaBr aqueous solution (0.45mmol) was added dropwise to it, and then stirred at constant temperature for 3h to obtain a suspension solution, cooled to room temperature and centrifuged for 3min to obtain a precipitate, which was used Wash with distilled water and ethanol several times. Then dry at 60°C to prepare BiOI / BiOBr multi-level structure composite visible light catalyst.

[0030] figure 1 It is the XRD spectrogram of the synthesis of BiOI / BiOBr multi-level structure composite visible light catalyst in Example 1 of the present invention, it can be seen that the diffraction peaks of 2θ=25.26, 32.31, 46.3...

Embodiment 2

[0035] Put 0.45mmolNaI, 0.45mmolNaBr, 0.1g citric acid, and 0.1g cetyltrimethylammonium bromide in a fixed ratio of distilled water: ethanol: ethylene glycol mixed solvent (100:30:70), stir and dissolve into a transparent solution ; and then heated to 60°C, to which 0.45mmol Bi(NO 3 ) 3 The aqueous solution was stirred at constant temperature for 4 hours to obtain a suspension solution, cooled to room temperature and centrifuged for 3 minutes to obtain a precipitate, which was washed with distilled water and ethanol several times. Then dry at 60°C to prepare BiOI / BiOBr multi-level structure composite visible light catalyst.

Embodiment 3

[0037]Put 0.45mmolNaI, 0.1g citric acid, and 0.1g cetyltrimethylammonium bromide in 200mL fixed ratio distilled water: ethanol: ethylene glycol mixed solvent (100:30:70). The transparent solution was heated at 60 °C, and 0.45 mmol Bi(NO 3 ) 3 The aqueous solution was stirred at constant temperature for 4 hours to obtain a suspension solution; the obtained suspension solution was cooled to room temperature and centrifuged for 3 minutes to obtain a precipitate, which was washed with distilled water and ethanol several times. Then dry it at 60°C to prepare BiOI photocatalyst.

[0038] 0.45mmolNaBr was replaced by NaI, and the remaining steps were the same as above to prepare BiOBr photocatalyst. The BiOI / BiOBr composite photocatalyst was prepared by stirring and mixing the obtained BiOI and BiOBr in equimolar ratio.

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Abstract

The invention discloses a BiOI / BiOBr multilevel structure composite visible light catalyst, and a preparation method and application thereof, and belongs to the field of the water treatment of photocatalytic materials. The composite photochemical catalyst BiOI / BiOBr which has a special appearance and a high catalytic effect is prepared by a low-temperature substep precipitation method. A BiOI / BiOBr composite is compounded by two different band gap semiconductor effective bodies, the light absorption range is expanded, the separation of photon-generated carriers is accelerated, and the compounding of electron hole pairs is reduced, so that the photocatalytic activity of light materials is improved. The method is easy to operate and low in cost, and a structure and composition of a photocatalytic composite material can be controlled effectively to control the photo-electrochemical property of the photocatalytic composite material, so that the BiOI / BiOBr multilevel structure composite visible light catalyst has the significant application value on the preparation of the semiconductor composite material.

Description

technical field [0001] The invention relates to a BiOI / BiOBr multi-level structure composite visible light catalyst and a preparation method and application thereof, belonging to the field of photocatalytic materials for water treatment. Background technique [0002] For half a century, with the increasingly severe environmental pollution and energy crisis, seeking efficient, harmless, convenient, easy-to-obtain, and environmentally friendly water pollution treatment technologies has become the focus of current scientific research. Semiconductor visible light catalysis technology has become one of the methods to solve pollution and energy problems due to its unique properties such as normal temperature reaction environment and the use of solar energy as light source. Since conventional TiO 2 The quantum yield is low and it can only be excited by ultraviolet light to generate electron-hole pairs. Therefore, it is an inevitable development trend in the field of photocatalysis...

Claims

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Application Information

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IPC IPC(8): B01J27/06C02F1/28C02F1/30C02F1/72C02F101/30
CPCY02W10/37
Inventor 余锡宾任快侠张坤罗宏德郑霄
Owner SHANGHAI NORMAL UNIVERSITY
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