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Application of bismuth sulfide catalyst with sulfur vacancies

A catalyst, the technology of bismuth sulfide, applied in the field of photocatalytic materials, can solve the problems that bismuth sulfide does not have good nitrogen fixation ability, does not have near-infrared nitrogen fixation performance, wastes energy, etc., achieves good photocatalytic nitrogen fixation performance, broadens the absorption range, increases The effect of high utilization

Pending Publication Date: 2021-03-09
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides an application of a bismuth sulfide nanorod photocatalyst in visible-near-infrared light nitrogen fixation to solve the problem that traditional bismuth sulfide does not have a good nitrogen fixation ability, nor does it have the performance of near-infrared nitrogen fixation, and industrial nitrogen fixation wastes energy , damage to the environment and other issues

Method used

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  • Application of bismuth sulfide catalyst with sulfur vacancies
  • Application of bismuth sulfide catalyst with sulfur vacancies
  • Application of bismuth sulfide catalyst with sulfur vacancies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve 1.94g of bismuth nitrate pentahydrate in 30mL of ethylene glycol solution at room temperature, and thoroughly ultrasonicate and stir for 20 minutes to obtain a clear solution. , fully ultrasonicated and stirred for 20 minutes until a clear solution was recorded as solution B; after solution B was added dropwise to solution A, stirring was continued for 30 minutes to obtain a black mixed solution. The mixed solution was put into a 50mL autoclave, and subjected to a constant temperature reaction at 180°C for 3h. After cooling to room temperature, the precipitate was centrifuged, washed with water and ethanol three times, and dried at 60°C to obtain the final product Bi 2 S 3 -3.

Embodiment 2

[0032] Dissolve 1.94g of bismuth nitrate pentahydrate in 30mL of ethylene glycol solution at room temperature, and thoroughly ultrasonicate and stir for 20 minutes to obtain a clear solution. , fully ultrasonicated and stirred for 20 minutes until a clear solution was recorded as solution B; after solution B was added dropwise to solution A, stirring was continued for 30 minutes to obtain a black mixed solution. The mixed solution was put into a 50mL autoclave, and subjected to a constant temperature reaction at 180°C for 1h. After cooling to room temperature, the precipitate was centrifuged, washed with water and ethanol three times, and dried at 60°C to obtain the final product Bi 2 S 3 -1.

Embodiment 3

[0034] Dissolve 1.94g of bismuth nitrate pentahydrate in 30mL of ethylene glycol solution at room temperature, and thoroughly ultrasonicate and stir for 20 minutes to obtain a clear solution. , fully ultrasonicated and stirred for 20 minutes until a clear solution was recorded as solution B; after solution B was added dropwise to solution A, stirring was continued for 30 minutes to obtain a black mixed solution. The mixed solution was put into a 50mL autoclave, and subjected to a constant temperature reaction at 180°C for 5h. After cooling to room temperature, the precipitate was centrifuged, washed with water and ethanol three times, and dried at 60°C to obtain the final product Bi 2 S 3 -5.

[0035] figure 1 The X-ray diffraction pattern of the sulfur-vacancy bismuth sulfide photocatalyst obtained in Examples 1-3 is shown. Compared with the PDF standard card, it is known that Bi 2 S 3 .

[0036] figure 2 The scanning electron microscope image of the sulfur-vacancy bis...

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Abstract

The invention provides application of a bismuth sulfide catalyst with sulfur vacancies, the bismuth sulfide catalyst is used for visible near-infrared photo-catalysis, and the visible near-infrared photo-catalysis is applied to nitrogen fixation. The bismuth sulfide catalyst with sulfur vacancies is stable, efficient, low in price and environment-friendly, and has wide application prospects in energy, environmental pollution treatment, and the like; water is used as a reducing agent, and the yield of ammonia gas under sunlight is 122.9 [mu]mol g<-1>h<-1> which is 4.3 times that of other bismuth sulfide containing a small amount of sulfur vacancies; under near-infrared light, the yield of ammonia gas is 58.6 [mu]mol g<-1>h<-1>, which is 2.6 times that of other bismuth sulfide containing a small amount of sulfur vacancies.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, more specifically, to the preparation of a bismuth sulfide nanorod photocatalyst containing sulfur vacancies and its application in visible-near infrared photocatalytic nitrogen fixation. Background technique [0002] Nitrogen is an indispensable element on the earth, but the nitrogen in the atmosphere cannot be used directly, so the subject of nitrogen fixation has attracted widespread attention. Traditional industrial nitrogen fixation uses the Haber method to reduce nitrogen to ammonia. This method not only needs to be carried out at high temperature (300-600°C) and high pressure (15-25MPa), but also consumes 1%-2% of global energy and releases a large amount of of greenhouse gases. In order to save energy and protect the environment, it is imperative to find new ways to avoid these problems caused by the Haber method. [0003] Since the first report in 1977 that nitrogen ca...

Claims

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Application Information

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IPC IPC(8): C01C1/02C01C1/04B01J27/04C01G29/00
CPCC01C1/026B01J27/04C01G29/00C01P2002/72C01P2004/03C01P2004/04C01P2002/01C01P2002/84B01J35/39Y02P20/52
Inventor 董晓丽王一童王宇郑楠
Owner DALIAN POLYTECHNIC UNIVERSITY
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