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Preparation method and application of titanium carbide modified bismuth-based photocatalyst for converting nitrogen to ammonia under visible light

A photocatalyst and visible light technology, applied in the preparation/separation of ammonia, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of restricting practical applications, unfavorable photocatalytic performance, etc., and achieve electron-hole recombination rate The effect of reducing and improving photocatalytic performance and simple preparation method

Inactive Publication Date: 2019-07-23
SOUTHWEST PETROLEUM UNIV
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  • Claims
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Problems solved by technology

Due to the high electron-hole recombination efficiency of its monomer, it has an adverse effect on its photocatalytic performance, which seriously restricts its practical application in photocatalysis and other aspects.

Method used

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  • Preparation method and application of titanium carbide modified bismuth-based photocatalyst for converting nitrogen to ammonia under visible light
  • Preparation method and application of titanium carbide modified bismuth-based photocatalyst for converting nitrogen to ammonia under visible light
  • Preparation method and application of titanium carbide modified bismuth-based photocatalyst for converting nitrogen to ammonia under visible light

Examples

Experimental program
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Embodiment 1

[0038] Weigh 0.9702g of bismuth nitrate pentahydrate and 50mg of Ti with an analytical balance 3 C 2 T x Dissolve in 20mL glycerol, weigh 0.238g potassium bromide and dissolve in 20mL glycerol, add the mixed solution containing potassium bromide dropwise into the glycerol solution of bismuth nitrate pentahydrate , after magnetic stirring for 30 min at room temperature, the mixed solution was transferred to a reaction kettle and reacted in an oven at 160° C. for 16 h, and the precipitate was washed and collected. The precipitate was dried in an oven at 70 °C for 10 h. Weigh 0.2 g of the obtained reactant and add 100 mL of distilled water, hydrolyze at room temperature for 16 h, dry the reaction precipitate at 70 ° C for 10 h, and obtain a solid powder that is Ti 3 C 2 T x / Bi 4 o 5 Br 2 composite photocatalyst.

example 1

[0039] Example 1 Gained Ti 3 C 2 T x / Bi 4 o 5 Br 2 Composite photocatalyst, single Bi 4 o 5 Br 2 The various performance values ​​are listed in Table 1. As can be seen from the table, the catalyst specific surface area prepared in Example 1 is 289m 2 g -1 , the efficiency of nitrogen fixation under visible light is about 2 times that of the monomer.

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Abstract

The invention relates to a preparation method of a Ti3C2Tx / Bi4O5Br2 composite photocatalyst which is used for photocatalytic conversion of nitrogen to ammonia, responses to visible light and is used for photocatalytic nitrogen fixation under visible light. 2 mmol of bismuth nitrate pentahydrate and 50 mg of Ti3C2Tx are dissolved in 20 mL of glycerol, 2 mmol of potassium bromide is dissolved in 20mL of glycerol, and a glycerol solution of potassium bromide is added drop by drop and stirred for reaction for 30 min; the mixed solution is transferred to a reactor for reaction at 160 DEG C for 16h, a dry precipitate is cleaned and collected. 0.3 g of the precipitate is weighed, 100 mL of distilled water is added, the precipitate is hydrolyzed at room temperature for 10 h, and obtained solid powder is dried, which is the Ti3C2Tx / Bi4O5Br2 composite photocatalyst. The prepared catalyst has enhanced response to visible light, higher catalytic activity, higher catalytic activity, and higher activity especially in photocatalytic nitrogen fixation, and can be applied to conversion of nitrogen to ammonia.

Description

technical field [0001] The present invention relates to a catalyst, in particular to a bismuth-based composite structure catalyst for photocatalytic conversion of nitrogen into ammonia, in particular to a preparation method and application of a composite photocatalyst for photocatalytic conversion of nitrogen into ammonia under visible light . Background technique [0002] Ammonia is used as an agricultural chemical fertilizer to provide the nitrogen element needed for plant growth, and it is one of the chemical products with the largest output in the world today. At present, there are two main sources of ammonia: biological nitrogen fixation to produce ammonia and chemical nitrogen fixation to produce ammonia. Biological nitrogen fixation is the most important chemical reaction in nature besides photosynthesis. However, most of the known nitrogen-fixing microorganisms cannot fix nitrogen on major food crops, so the protein in human food mainly comes from chemical nitrogen...

Claims

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Application Information

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IPC IPC(8): B01J27/22B01J35/10C01C1/04
CPCB01J27/22C01C1/0411B01J35/39B01J35/615Y02P20/52
Inventor 白杨张凯黎猩石晛程焱张昊李国军李成
Owner SOUTHWEST PETROLEUM UNIV
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