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Nitrogen-doped attapulgite/carbon/bismuth oxybromide composite nitrogen fixation photocatalyst and preparation method and application thereof

A technology of attapulgite and bismuth oxybromide, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, preparation/separation of ammonia, etc., which can solve the problem of large energy consumption and achieve cost reduction Low cost, simple process, and the effect of improving charge transfer efficiency

Active Publication Date: 2020-04-17
常州纳欧新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional Haber-Bosch process uses iron-based catalysts to reduce N2 to NH3 under harsh reaction conditions (15-25MPa, 300-550℃), Consumes a lot of energy and inevitably causes a lot of CO2 emissions

Method used

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  • Nitrogen-doped attapulgite/carbon/bismuth oxybromide composite nitrogen fixation photocatalyst and preparation method and application thereof
  • Nitrogen-doped attapulgite/carbon/bismuth oxybromide composite nitrogen fixation photocatalyst and preparation method and application thereof
  • Nitrogen-doped attapulgite/carbon/bismuth oxybromide composite nitrogen fixation photocatalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Take 3g of attapulgite and 1mL of aniline and evenly disperse in 50mL of aqueous solution (solid-to-liquid ratio of attapulgite to aniline (g / mL)=3:1), transfer the system to 0°C and stir for 24h, in-situ polymerization Attapulgite / polyaniline composite material was obtained. Further calcined carbonization (900℃ / 2h, N 2 ), the nitrogen-doped attapulgite / carbon precursor material can be obtained.

[0028] (2) Weigh 91.5 mg of nitrogen-doped attapulgite / carbon prepared in step (1) and 0.119 g of potassium bromide, dissolve in 30 mL of aqueous solution and sonicate for 15 min to obtain a uniform suspension.

[0029] (3) Weigh 0.485 g of bismuth nitrate pentahydrate and disperse it in 20 mL of glycerin with magnetic stirring for 0.5 h to dissolve it to prepare a bismuth nitrate solution.

[0030] (4) The solution prepared in step (2) was slowly added dropwise to step (3) under magnetic stirring conditions, after the dropwise addition was completed and vigorously stirr...

Embodiment 2

[0033] (1) Take 3g of attapulgite and 1mL of aniline and evenly disperse in 50mL of aqueous solution (solid-to-liquid ratio of attapulgite to aniline (g / mL) = 3:1), transfer the system to 0°C and stir for 12h, in situ polymerization Attapulgite / polyaniline composite material was obtained. Further calcined carbonization (900℃ / 2h, N 2 ), the nitrogen-doped attapulgite / carbon precursor material can be obtained.

[0034] (2) Weigh 152.5 mg of nitrogen-doped attapulgite / carbon prepared in step (1) and 0.119 g of potassium bromide, dissolve in 30 mL of aqueous solution and sonicate for 15 min to obtain a uniform suspension.

[0035] (3) Weigh 0.485 g of bismuth nitrate pentahydrate and disperse it in 20 mL of glycerin with magnetic stirring for 0.5 h to dissolve it to prepare a bismuth nitrate solution.

[0036] (4) The solution prepared in step (2) was slowly added dropwise to step (3) under magnetic stirring conditions, after the dropwise addition was completed and vigorously st...

Embodiment 3

[0039] The attapulgite / carbon precursor material was impregnated with bismuth nitrate and potassium bromide respectively to explore the effect of BiOBr crystals on the attapulgite / carbon precursor material in situ growth.

[0040] (1) Take 3g of attapulgite and 1mL of aniline and evenly disperse in 50mL of aqueous solution (solid-to-liquid ratio of attapulgite to aniline (g / mL) = 3:1), transfer the system to 0°C and stir for 12h, in situ polymerization Attapulgite / polyaniline composite material was obtained. Further calcined carbonization (900℃ / 2h, N 2 ), the nitrogen-doped attapulgite / carbon precursor material can be obtained.

[0041] (2) Weigh 427 mg of nitrogen-doped attapulgite / carbon prepared in step (1) and 0.97 g of bismuth nitrate pentahydrate, disperse in 30 mL of glycerin and sonicate for 30 min to obtain a uniform suspension.

[0042] (3) Weigh 0.238 g of potassium bromide in 30 mL of aqueous solution and magnetically stir for 0.5 h to dissolve it to prepare a pota...

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Abstract

The invention belongs to the field of nitrogen-fixing photocatalyst preparation, and particularly relates to a nitrogen-doped attapulgite / carbon / bismuth oxybromide composite nitrogen-fixing photocatalyst and a preparation method and application thereof. The preparation method includes the steps: dispersing attapulgite and aniline in an aqueous solution, and carrying out in-situ polymerization to obtain an attapulgite / polyaniline composite material; calcining and carbonizing to obtain a nitrogen-doped attapulgite / carbon precursor material, then adding the nitrogen-doped attapulgite / carbon precursor material into a potassium bromide solution, and carrying out uniform ultrasonic dispersion to obtain a dispersion liquid; and dropwise adding the dispersion liquid into a bismuth nitrate glycerolsolution, and continuously stirring to obtain the nitrogen-doped attapulgite / carbon / bismuth oxybromide composite material. Nitrogen-doped attapulgite / carbon and bismuth oxybromide semiconductors areused for constructing a heterojunction material, so that the recombination of photo-induced electrons and holes can be effectively reduced, the visible light absorption efficiency of the material is effectively improved, photocatalytic active sites are provided, and the material has a remarkable application effect in the aspect of nitrogen fixation.

Description

technical field [0001] The invention belongs to the field of preparation of composite materials, and in particular relates to the application and preparation method of a nitrogen-doped attapulgite / carbon / bismuth oxybromide composite nitrogen-fixing photocatalyst. Background technique [0002] Ammonia (NH 3 ) is one of the bulk chemical products, the nitrogen in the air (N 2 ) The hydrogenation reduction ammonia synthesis industry occupies an important position in the national economy. Nitrogen fertilizers used in agriculture such as: urea, ammonium nitrate, ammonium phosphate, ammonium chloride and various nitrogen-containing compound fertilizers, and alkali (Na 2 CO 3 ) are all based on ammonia. At the same time, all living organisms need nitrogen to synthesize proteins, nucleic acids and other biomolecules in the body. Restore N 2 It plays an important role in industry and life system. Although N 2 Accounting for 78% of the earth's air, how to activate dissociated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J23/18B01J21/16B01J21/18B01J35/08C01C1/04
CPCB01J27/24B01J21/16B01J23/18B01J21/185C01C1/0411B01J35/51B01J35/39Y02P20/52
Inventor 姚超尹克诚刘文杰左士祥吴凤芹李霞章严向玉王灿
Owner 常州纳欧新材料科技有限公司
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