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Preparation of nanometer carbon fiber supported halogen bismuth oxide photocatalyst, and applications of nanometer carbon fiber supported halogen bismuth oxide photocatalyst in solar energy nitrogen fixation

A nano-carbon fiber and photocatalyst technology, applied in the field of photocatalytic materials, can solve the problems of narrow band gap and low solar nitrogen fixation ability, and achieve high quantum efficiency and good solar nitrogen fixation performance

Inactive Publication Date: 2019-02-01
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the layered structure of bismuth oxyhalide (BiOX) is conducive to the separation of photogenerated electrons and holes, its band gap is narrow, the light absorption range is wide, and the production process is simple, cheap, non-toxic, etc.
Nevertheless, conventional BiOX still exhibits low solar nitrogen fixation capacity

Method used

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  • Preparation of nanometer carbon fiber supported halogen bismuth oxide photocatalyst, and applications of nanometer carbon fiber supported halogen bismuth oxide photocatalyst in solar energy nitrogen fixation
  • Preparation of nanometer carbon fiber supported halogen bismuth oxide photocatalyst, and applications of nanometer carbon fiber supported halogen bismuth oxide photocatalyst in solar energy nitrogen fixation
  • Preparation of nanometer carbon fiber supported halogen bismuth oxide photocatalyst, and applications of nanometer carbon fiber supported halogen bismuth oxide photocatalyst in solar energy nitrogen fixation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Add 0.48g of bismuth nitrate pentahydrate, 0.0612g of sodium bromide and 0.0664g of potassium iodide into 10mL of ethylene glycol solution, stir well for 20min until the solution becomes clear, then add 60mL of ethanol solution, stir the mixed solution for 30min, add 0.03g of CNFs solution, and ultrasonicate for 5min Then put it into a 1-2MPa high-pressure reactor, and carry out a constant temperature hydrothermal reaction at 160°C for 12 hours. The product was cooled to room temperature for centrifugation, washed with water and ethanol solution for 6 times, and dried at 60°C to collect the powder to obtain the final product BiOI / BiOBr / CNFs.

[0055] figure 1 It is the XRD diffraction pattern of the BiOI / BiOBr / CNFs photocatalyst obtained in this example, and compared with the PDF standard card, it is known that the obtained BiOBr and BiOI are in the tetragonal phase.

[0056] figure 2 It is the scanning electron microscope image of the BiOI / BiOBr / CNFs photocatalyst o...

Embodiment 2

[0062] Add 0.48g of bismuth nitrate pentahydrate, 0.0816g of sodium bromide and 0.0332g of potassium iodide into 10mL of ethylene glycol solution, stir well for 20min until the solution becomes clear, then add 60mL of ethanol solution, stir the mixed solution for 30min, add 0.03g of CNFs solution, and ultrasonicate for 5min Then put it into a 1-2MPa high-pressure reactor, and carry out a constant temperature hydrothermal reaction at 160°C for 12 hours. The product was cooled to room temperature for centrifugation, washed with water and ethanol solution for 6 times, and dried at 60°C to collect the powder to obtain the final product BiOI / BiOBr / CNFs.

Embodiment 3

[0064] Add 0.48g of bismuth nitrate pentahydrate, 0.0408g of sodium bromide and 0.0996g of potassium iodide into 10mL of ethylene glycol solution, stir well for 20min until the solution becomes clear, then add 60mL of ethanol solution, stir the mixed solution for 30min, add 0.03g of CNFs solution, and ultrasonicate for 5min Then put it into a 1-2MPa high-pressure reactor, and carry out a constant temperature hydrothermal reaction at 160°C for 12 hours. The product was cooled to room temperature for centrifugation, washed with water and ethanol solution for 6 times, and dried at 60°C to collect the powder to obtain the final product BiOI / BiOBr / CNFs.

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Abstract

The invention discloses a photocatalyst, and more specifically discloses nanometer carbon fiber supported bismuth oxybromide bismuth oxyiodide with the molecular formula BiOI / BiOBr / CNFs. The nanometercarbon fiber supported bismuth oxybromide bismuth oxyiodide is used for high efficiency solar energy nitrogen fixation. A preparation method comprises following steps: 1, an organic solution is takenas a solvent; 2, an organic matter with a molecular weight larger than 5000 is dissolved in the organic solvent so as to obtain a mixed solution; 3, electrostatic spinning is adopted for spinning; 4,fiber carbonization is carried out so as to obtain nanometer carbon fiber; 5, an organic alcohol is taken as a solvent; 6, a bismuth salt compound, a bromine salt compound, and an iodine salt compound are added into the organic alcohol solvent for mixing and full stirring; 7, the nanometer carbon fiber is added, and ultrasonic treatment is carried out; 8, an obtained product is introduced into areaction vessel for constant temperature reaction; and 9, an obtained reaction product is cooled to room temperature for centrifugation, respective washing with water and an alcohol solution is carried out, drying is carried out, an obtained powder is collected so as to obtain the nanometer carbon fiber supported bismuth oxybromide bismuth oxyiodide. The catalyst prepared using the preparation method is friendly to the environment, is nontoxic, is low in cost, and possesses high efficiency solar energy nitrogen fixation performance; and batch production can be realized.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, more specifically, to the preparation of a nano-carbon fiber supported bismuth oxybromide bismuth oxyiodide (BiOI / BiOBr / CNFs) photocatalyst and the application of solar nitrogen fixation. Background technique [0002] As we all know, the air contains 78% nitrogen, but because N≡N in nitrogen molecules is highly stable, it is difficult to dissociate and apply it. The traditional Haber method is used in industry for nitrogen fixation, but the conditions are relatively harsh, and it needs to be carried out at high temperature (300-600°C) and high pressure (15-25MPa), and then catalyzed by a catalyst, nitrogen and hydrogen react to produce ammonia. A large amount of carbon dioxide is produced in the process of industrial nitrogen fixation, which exacerbates the problem of greenhouse effect. Therefore, a technology with low carbon and environmental protection and mild reaction condit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06B01J35/06C01C1/04
CPCC01C1/0411B01J27/06B01J35/58B01J35/39Y02P20/52Y02P20/133
Inventor 董晓丽华承贺王宇郑楠马红超张秀芳
Owner DALIAN POLYTECHNIC UNIVERSITY
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