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Solar nitrogen fixation pholocatalyst as well as purpose and preparation method thereof

A photocatalyst and solar energy technology, applied in the field of photocatalytic materials, can solve problems such as weak binding ability, and achieve the effects of effective nitrogen fixation performance, broad development space, and great application potential

Inactive Publication Date: 2018-03-30
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, conventional BiOBr still exhibits a weak binding ability to nitrogen

Method used

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  • Solar nitrogen fixation pholocatalyst as well as purpose and preparation method thereof
  • Solar nitrogen fixation pholocatalyst as well as purpose and preparation method thereof
  • Solar nitrogen fixation pholocatalyst as well as purpose and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Heat 40ml of ethylene glycol solution to 160°C and cool down to 120°C. 1.92g of bismuth nitrate pentahydrate and 0.416g of sodium bromide were added to the above solution, mixed and fully stirred for 35 minutes to a clear solution, then 120ml of isopropanol solution was added, the resulting solution was stirred for 30 minutes, then put into a 1-2Mpa high-pressure reactor, and kept at a constant temperature of 160°C Hydrothermal reaction 12h. The product was cooled to room temperature, centrifuged and washed 5 times with water and ethanol solution, dried at 60°C and ground to powder. Calcined at 200°C and 360ml / min hydrogen atmosphere for 4h to obtain the final product H-BiOBr.

[0042] figure 1 It is the XRD diffraction pattern of the H-BiOBr photocatalyst obtained in this example, and compared with the PDF standard card, it is known that the obtained BiOBr is a tetragonal phase.

[0043] figure 2 It is the scanning electron microscope picture of the H-BiOBr photoc...

Embodiment 2

[0048] Heat 20ml of ethylene glycol solution to 200°C and cool down to 60°C. Add 0.24g of bismuth nitrate pentahydrate and 0.052g of sodium bromide to the above solution, mix and stir thoroughly for 30 minutes until the solution becomes clear, then add 60ml of isopropanol solution, stir the resulting solution for 30 minutes, put it into a high-pressure reactor, and perform a constant temperature hydrothermal reaction at 160°C 20h. The product was cooled to room temperature, centrifuged and washed 5 times with water and ethanol solution, dried at 60°C and ground to powder. Calcined at 150°C and 360ml / min hydrogen atmosphere for 4h to obtain the final product H-BiOBr.

Embodiment 3

[0050] Heat 20ml of ethylene glycol solution to 200°C and cool down to 60°C. Add 0.24g of bismuth nitrate pentahydrate and 0.052g of sodium bromide to the above solution, mix and stir thoroughly for 30 minutes until the solution becomes clear, then add 60ml of isopropanol solution, stir the resulting solution for 30 minutes, put it into a high-pressure reactor, and perform a constant temperature hydrothermal reaction at 160°C 20h. The product was cooled to room temperature, centrifuged and washed 5 times with water and ethanol solution, dried at 60°C and ground to powder. Calcined at 150°C and 360ml / min hydrogen atmosphere for 2h to obtain the final product H-BiOBr.

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PUM

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Abstract

The invention discloses a solar nitrogen fixation pholocatalyst. The solar nitrogen fixation pholocatalyst is hydrogenated bismuth oxybromide, has the molecular formula of H-BiOBr, is used for solar nitrogen fixation photocatalysis, and is used for a solar nitrogen fixation photocatalytic reaction in which water is used as a reducing agent. The preparation method of the catalyst comprises steps of1, taking an ethylene glycol, isopropanol or propanetriol solution; 2, adding a bismuth-containing compound and a bromine-containing compound into the alcoholic solution, mixing and sufficiently agitating; 3, agitating until a clear solution, then adding a neutral solution, agitating, then loading in a reaction kettle, and carrying out a thermostatic reaction; 4, cooling to a room temperature, carrying out centrifugal separation, washing for multiple times by using water and an ethanol solution, drying, and then grinding into powder; 5, incinerating in a hydrogen atmosphere, so as to obtain the hydrogenated bismuth oxybromide. The hydrogenated bismuth oxybromide pholocatalyst obtained by the method provided by the invention is green and nontoxic and is low in price; raw materials are simple and wide in source; the method is easy to operate and moreover, the solar nitrogen fixation pholocatalyst can be massively prepared within a short time and has favorable solar nitrogen fixation photocatalytic performance.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to the preparation and application of a hydrogenated bismuth oxybromide (H-BiOBr) solar nitrogen-fixing photocatalyst. Background technique [0002] As we all know, molybdenum-based nitrogenase can fix 60% nitrogen in the atmosphere, and it is a more effective substrate in the biological field to reduce nitrogen to ammonia. Compared with biological nitrogen fixation, photocatalytic reduction of nitrogen in the atmosphere to produce ammonia has attracted widespread attention. Photocatalytic technology provides an effective way for nitrogen fixation. Semiconductor photocatalysts can convert solar energy into chemical energy. Compared with industrial nitrogen fixation, a large amount of fossil fuel combustion is harmful to the environment (traditional Haber method at 25MPa, 723-773K), this reaction process is greener and the reaction conditions are milder. The reacti...

Claims

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Application Information

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IPC IPC(8): B01J27/06B01J35/08C02F1/30C01C1/02C01G29/00C02F101/30
CPCC01C1/026C01G29/00C02F1/30B01J27/06C02F2305/10C02F2101/308C01P2004/45C01P2002/84C01P2004/03C01P2004/34C01P2002/72B01J35/39B01J35/51Y02P20/52
Inventor 董晓丽毕元清王宇马红超张秀芳
Owner DALIAN POLYTECHNIC UNIVERSITY
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