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Carbon nitride/bismuth oxychloride/tungsten oxide heterojunction photocatalyst as well as preparation method and application thereof

A technology of bismuth oxychloride and photocatalyst, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve disadvantages and other problems, and achieve the effects of enhancing light absorption, enhancing light absorption, and improving light absorption characteristics

Active Publication Date: 2020-09-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, unactivated NO molecules are difficult to adsorb and activate on the surface of well-crystallized photocatalyst powders, which is unfavorable for the removal of NO at ppb level

Method used

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  • Carbon nitride/bismuth oxychloride/tungsten oxide heterojunction photocatalyst as well as preparation method and application thereof
  • Carbon nitride/bismuth oxychloride/tungsten oxide heterojunction photocatalyst as well as preparation method and application thereof
  • Carbon nitride/bismuth oxychloride/tungsten oxide heterojunction photocatalyst as well as preparation method and application thereof

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preparation example Construction

[0027] A preparation method of carbon nitride / bismuth oxychloride / tungsten oxide heterojunction photocatalyst of the present invention comprises the following steps:

[0028] Step 1: Put 30g of urea in a quartz crucible with a cover, place the crucible in a muffle furnace, raise the temperature from room temperature to 550°C at a rate of 15°C / min, keep it warm for 4 hours, and then cool it down to 50°C with the furnace , to give g-C with nitrogen vacancies 3 N 4-x Powder;

[0029] Step 2: Add a certain amount of g-C 3 N 4-x and WCl 6 Disperse the powder in 40mL of absolute ethanol, stir for 30min, and ultrasonicate for 60min to obtain a blue suspension;

[0030] Step 3: While magnetically stirring, a certain amount of NaBiO 3 Disperse the powder in the suspension, and stir for 30 minutes to obtain a light brown suspension, which is the reaction precursor, and the molar ratio of Bi and Cl in the reaction precursor is (0.15-0.5):1;

[0031] Step 4: Put the reaction precur...

Embodiment 1

[0035] Step 1: Put 30g of urea in a quartz crucible with a cover, place the crucible in a muffle furnace, raise the temperature from room temperature to 550°C at a rate of 15°C / min, keep it warm for 4 hours, and then cool it down to 50°C with the furnace , to give g-C with nitrogen vacancies 3 N 4-x Powder;

[0036] Step 2: Add 0.3g of g-C 3 N 4-x and 0.225g of WCl 6 Disperse the powder in 40mL of absolute ethanol, stir for 30min, and ultrasonicate for 60min to obtain a blue suspension;

[0037] Step 3: While stirring magnetically, mix 0.238 g of NaBiO 3Disperse the powder into the above suspension, the molar ratio of Bi element to Cl element is 0.25:1, after stirring for 30 minutes, a light brown suspension is obtained, which is the reaction precursor;

[0038] Step 4: Place the reaction precursor solution in a hydrothermal reaction kettle with a reaction filling ratio of about 65%, raise the temperature from room temperature to 140°C in 60 minutes, and finish the react...

Embodiment 2

[0041] Step 1: Put 30g of urea in a quartz crucible with a cover, place the crucible in a muffle furnace, raise the temperature from room temperature to 550°C at a rate of 15°C / min, keep it warm for 4 hours, and then cool it down to 50°C with the furnace , to give g-C with nitrogen vacancies 3 N 4-x Powder;

[0042] Step 2: Add 0.3g of g-C 3 N 4-x and 0.225g of WCl 6 Disperse the powder in 40mL of absolute ethanol, stir for 30min, and ultrasonicate for 60min to obtain a blue suspension;

[0043] Step 3: While stirring magnetically, dissolve 0.476 g of NaBiO 3 Disperse the powder into the above suspension, the molar ratio of Bi element to Cl element is 0.5:1, after stirring for 30 minutes, a light brown suspension is obtained, which is the reaction precursor;

[0044] Step 4: Place the reaction precursor solution in a hydrothermal reactor with a reaction filling ratio of about 80%, raise the temperature from room temperature to 160°C in 60 minutes, and finish the reaction...

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Abstract

The invention discloses a carbon nitride / bismuth oxychloride / tungsten oxide heterojunction photocatalyst as well as a preparation method and application thereof. The method comprises the following steps: 1, dispersing g-C3N4-x powder containing nitrogen vacancy, WCl6 powder and NaBiO3 powder into absolute ethyl alcohol; subjecting the precursor solution to an in-situ hydrothermal reaction, allowing a reaction system to be anoxic, forming a reduced reaction atmosphere, forming oxygen vacancies in BiOCl, meanwhile, forming WO2.92 containing the oxygen vacancies and having a non-stoichiometric ratio, and enabling nitrogen to vacancy in g-C3N4-x capture electrons to promote WO3 to be reduced into WO2.92 having the non-stoichiometric ratio; and 2, washing the precipitate in the reaction solution, and drying to obtain the carbon nitride / bismuth oxychloride / tungsten oxide heterojunction photocatalyst, which can implement photocatalytic NO deep oxidation under visible light irradiation and hasfavorable application prospects.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst material preparation, and specifically relates to a carbon nitride / bismuth oxychloride / tungsten oxide heterojunction photocatalyst and a preparation method and application thereof. Background technique [0002] The rapid development of industry has led to increasingly serious air pollution, seriously affecting the sustainable development of human society and people's health. Photocatalytic technology can be used to control air pollution with good results, and the cost of using sunlight as the driving force is low, which has obvious advantages. [0003] Photocatalytic NO removal, toxic NO during reaction 2 Gas and HNO 2 It is the main intermediate product and will cause secondary pollution. Therefore, it is necessary to increase the NO to the final product HNO 3 Conversion rates. In addition, it is difficult for unactivated NO molecules to adsorb and activate on the surface of well-cryst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01D53/86B01D53/56
CPCB01J27/24B01D53/8628B01J35/39
Inventor 谈国强王敏毕钰张丹李斌党明月任慧君夏傲
Owner SHAANXI UNIV OF SCI & TECH
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