Oxygen vacancy-containing transition metal doped BiOBr nanosheet photocatalyst, preparation method and applications thereof

A transition metal and photocatalyst technology, applied in physical/chemical process catalysts, ammonia preparation/separation, chemical instruments and methods, etc., can solve problems such as restricting popularization and application, difficult adsorption and activation of inert nitrogen molecules, etc., to achieve environmental friendliness , Conducive to sustainable development, the effect of high catalytic efficiency

Active Publication Date: 2020-04-21
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because BiOBr materials are not easy to adsorb and activate inert nitrogen molecules, their popularization and application in the field of nitrogen to ammonia conversion are seriously restricted.

Method used

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  • Oxygen vacancy-containing transition metal doped BiOBr nanosheet photocatalyst, preparation method and applications thereof
  • Oxygen vacancy-containing transition metal doped BiOBr nanosheet photocatalyst, preparation method and applications thereof
  • Oxygen vacancy-containing transition metal doped BiOBr nanosheet photocatalyst, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Preparation of BiOBr nanosheets:

[0023] Add 23.8 g / L potassium bromide solution dropwise to 48.5 g / L bismuth nitrate nitric acid solution in a volume ratio of 1:2, mix well and adjust the pH of the mixed solution to neutral with ammonia water, and add to the volume 100 mL Teflon-lined stainless steel autoclave. The autoclave was kept at 433 K for 18 hours and then cooled to room temperature. The precipitate was collected and washed with absolute ethanol and deionized water to remove organic solvent residues. The final product was dried in an oven at 333 K for 12 hours. Obtain BiOBr nanosheets.

Embodiment 2

[0024] Example 2 Preparation of BiOBr nanosheets doped with transition metals (iron, molybdenum, or nickel):

[0025] Add a solution of 0.08 M ferric chloride or ammonium molybdate or nickel chloride dihydrate to a 48.5 g / L bismuth nitrate nitric acid solution, and stir for ten minutes (the molar ratio of transition metal salt to bismuth nitrate is 0.5%). Add 23.8 g / L of potassium bromide solution to the above solution in a volume ratio of 1:2, mix evenly, adjust the pH of the mixed solution to neutral with ammonia, and add it to a 100 mL Teflon-lined stainless steel autoclave in. The autoclave was kept at 433 K for 18 hours and then cooled to room temperature. The precipitate was collected and washed with absolute ethanol and deionized water to remove organic solvent residues. The final product was dried in an oven at 333 K for 12 hours to obtain a transition metal-doped BiOBr catalyst product BiOBr-M-0.5 (M = Fe, Mo or Ni) without oxygen vacancies.

Embodiment 3

[0026] Example 3 Preparation of transition metal (iron, molybdenum, or nickel) doped BiOBr nanosheets:

[0027] Add a solution of 0.08 M ferric chloride or ammonium molybdate or nickel chloride dihydrate to a 48.5 g / L bismuth nitrate nitric acid solution, and stir for ten minutes (the molar ratio of metal salt to bismuth nitrate is 1%). Add 23.8 g / L of potassium bromide solution to the above solution in a volume ratio of 1:2, mix evenly, adjust the pH of the mixed solution to neutral with ammonia, and add it to a 100 mL Teflon-lined stainless steel autoclave in. The autoclave was kept at 433 K for 18 hours and then cooled to room temperature. The precipitate was collected and washed with absolute ethanol and deionized water to remove organic solvent residues. The final product was dried in an oven at 333 K for 12 hours to obtain a transition metal-doped BiOBr catalyst product BiOBr-M-1, (M = Fe / Mo / Ni) without oxygen vacancies.

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Abstract

The invention discloses an oxygen-vacancy-containing transition metal (iron, molybdenum and nickel)-doped BiOBr nanosheet photocatalyst and a preparation method thereof, and applications in photocatalytic reduction of nitrogen to produce ammonia. According to the invention, bismuth nitrate pentahydrate, potassium bromide and metal salts (anhydrous ferric chloride, sodium molybdate and nickel chloride dehydrate) are used as raw materials, a transition metal doped BiOBr nanosheet is synthesized through a hydrothermal method, and the transition metal doped BiOBr nanosheet photocatalyst containingoxygen vacancy is obtained through secondary solvothermal method treatment; and the method is simple in preparation process, visible light is used as driving energy, water is used as a reaction solvent, the oxygen-vacancy-containing transition metal doped BiOBr nanosheet is used for photocatalytic reduction of nitrogen to produce ammonia for the first time, and the BiOBr nanosheet photocatalyst has high catalytic activity and is beneficial to sustainable development of environment and energy.

Description

Technical field [0001] The invention belongs to the technical field of catalyst preparation and sustainable development of environment and energy, and specifically relates to a transition metal-doped BiOBr nanosheet photocatalyst containing oxygen vacancies, and a preparation method and application thereof. Background technique [0002] As the main component of the atmosphere, nitrogen is easily available in nature. The nitrogen element it contains is an essential element for all living things to build proteins and other biological molecules. Since the inert N≡N bond has extremely strong bond energy and is difficult to be destroyed, the problem of realizing the efficient utilization of nitrogen has been facing a long-term and severe challenge. At present, the industrial conversion of nitrogen to ammonia mainly uses the Haber-Bosch process, which combines the nitrogen and methane in the air at high temperature (673-873 K) and strong pressure (15-25 MPa). The hydrogen in the stea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/128B01J27/132B01J35/00C01C1/04
CPCB01J27/128B01J27/132C01C1/0411B01J35/39Y02P20/52
Inventor 徐艺军陈雪唐紫蓉
Owner FUZHOU UNIV
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