Preparation method of bismuth oxybromide photocatalyst

A bismuth oxybromide and photocatalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve high-efficiency degradation activity, safe operation, and improved crystallinity

Inactive Publication Date: 2010-07-28
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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There is no report on the synthesis of bismuth oxybrom

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  • Preparation method of bismuth oxybromide photocatalyst
  • Preparation method of bismuth oxybromide photocatalyst
  • Preparation method of bismuth oxybromide photocatalyst

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[0037] The bismuth oxybromide that the present invention obtains adopts cetylpyridinium bromide as raw material, and Bi(NO 3 ) 3 ·6H 2 O solid powder was dissolved in dilute nitric acid solution to obtain dissolved Bi(NO 3 ) 3 Dilute nitric acid solution, and then Bi(NO3) 3 ·6H 2 After the O solution is added dropwise to the cetylpyridinium bromide solution, the pH needs to be adjusted to 7; the ratio of the two raw materials satisfies nBi:nBr=1:1.5.

[0038] figure 1 The kinetic curves of bismuth oxybromide degrading various types of dyes are expressed. It can be seen from the figure that bismuth oxybromide can degrade various types of dyes to varying degrees, and the catalyst has a high-efficiency degradation effect on printing and dyeing wastewater;

[0039] figure 2 Expressed that bismuth oxybromide can effectively mineralize the dye acid pink SRB in a short time;

[0040] image 3 Expressed with the best titanium dioxide (P 2 o 5 ) photocatalyst, bismuth oxybr...

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Abstract

A preparation method of bismuth oxybromide with high-efficient visible light activities adopts cetyl pyridine bromide as raw material, the surfactant has the functions of providing bromine source and structure template agent simultaneously, and the bismuth oxybromide with stable structure and performance and high activity can be obtained. Dilute nitric acid solution dissolved with Bi(NO3)3 is dripped into the cetyl pyridine bromide solution to produce faint yellow precipitate, and then the pH value needs to be adjusted to 7; and the mass ratio of the two raw materials meets nBi: nBr=1: 1.5. The bismuth oxybromide synthesized by the method is faint yellow solid powder and has no special smell. The bismuth oxybromide has quadrangular crystal form detected by an instrument, the specific surface area is large, the surface aperture is small, the band gap is 2.62eV, the crystallinity is 98.3% of layer crystal, the product purity is more than 99.9%, the visible light activity of the prepared bismuth oxybromide is high, and various organic dyes and microcystic toxins can be degraded effectively in a short time.

Description

technical field [0001] The invention relates to a preparation method of a catalyst capable of degrading toxic organic pollutants, in particular to a preparation method of a bismuth oxybromide photocatalyst. Background technique [0002] Traditional nano-titanium dioxide has always been a typical representative of efficient oxidation technology, which can efficiently degrade a variety of toxic organic pollutants. However, due to the bottleneck of its application that must use ultraviolet light as a light source, it is a new idea to find a new type of photocatalyst that can directly absorb visible light. Bismuth oxybromide (BiOBr) has a unique structure with both open structure and indirect transition mode, which is conducive to the effective separation and charge transfer of hole-electron pairs, so the catalyst has high visible light photocatalytic activity. The synthesis of bismuth oxybromide (BiOBr) using surfactant cetylpyridinium bromide has not been reported. Contents...

Claims

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Application Information

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IPC IPC(8): B01J27/06C02F1/32C02F1/30C02F103/30
Inventor 方艳芬程根伟鲁旭阳范继辉
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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