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Bismuth vanadate powder and preparation method thereof

A bismuth vanadate and powder technology, which is applied in chemical instruments and methods, bismuth compounds, vanadium compounds, etc., can solve the problems of special reactants, complex reaction conditions, and unsuitability for industrial production, and achieve low energy consumption and cost, The effect of high photocatalytic activity and low cost

Inactive Publication Date: 2008-12-10
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metalorganic thermal decomposition method requires special reactants and complicated reaction conditions, so it is not suitable for industrial production [Mater.Res.Bull.1992, 27, 823]

Method used

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  • Bismuth vanadate powder and preparation method thereof
  • Bismuth vanadate powder and preparation method thereof
  • Bismuth vanadate powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: take by weighing an appropriate amount of Bi(NO 3 ) 3 ·5H 2 O dissolved in 0.5mol / L HNO 3 solution, forming a colorless transparent solution. Weigh an appropriate amount of NH 4 VO 3 Soluble in 0.5mol / L HNO 3 solution, forming a reddish-brown solution. According to the bismuth: vanadium: nitric acid molar ratio of 1:1:2.5 will contain NH 4 VO 3 HNO 3 The solution was added dropwise to the Bi(NO 3 ) 3 HNO 3 In the solution, after magnetic stirring for 2 hours, the solution changed from reddish brown to yellow, and a yellow precipitate appeared. Adjust the pH of the above solution to 6.5 with ammonia water, and stir magnetically for 2 hours; according to the molar ratio of bismuth: vanadium: nitric acid: CTAB of 1:1:2.5:0.025, add CTAB to the above yellow solution, and stir magnetically for 2 hours to form BiVO 4 precursors. BiVO 4The precursors were put into the reactor and treated with hydrothermal treatment at 80°C for 72 hours. Centrifuge...

Embodiment 2

[0026] Embodiment 2: take by weighing an appropriate amount of Bi(NO 3 ) 3 ·5H 2 O dissolved in 0.5mol / L HNO 3 solution to form a colorless transparent solution, weigh an appropriate amount of NH 4 VO 3 Soluble in 0.5mol / L HNO 3 solution, forming a reddish-brown solution. According to the bismuth: vanadium: nitric acid molar ratio of 1:1:2.5 will contain NH 4 VO 3 HNO 3 The solution was added dropwise to the Bi(NO 3 ) 3 HNO 3 In the solution, after magnetic stirring for 2 hours, the solution changed from reddish brown to yellow, and a yellow precipitate appeared. Adjust the pH of the solution to 6.5 with ammonia water, and stir magnetically for 2 hours; according to the molar ratio of bismuth: vanadium: nitric acid: CTAB of 1:1:2.5:0.025, add CTAB to the above yellow solution, and stir magnetically for 2 hours to form BiVO 4 precursors. BiVO 4 The precursors were put into the reactor and treated with hydrothermal treatment at 120°C for 72 hours. After cooling, c...

Embodiment 3

[0028] Embodiment 3: take by weighing an appropriate amount of Bi(NO 3 ) 3 ·5H 2 O dissolved in 0.5mol / L HNO 3 solution, forming a colorless transparent solution. Weigh an appropriate amount of NH 4 VO 3 Soluble in 0.5mol / L HNO 3 solution, forming a reddish-brown solution; according to the bismuth: vanadium: nitric acid molar ratio of 1:1:2.5 will contain NH 4 VO 3 HNO 3 The solution was added dropwise to the Bi(NO 3 ) 3 HNO 3 In the solution, after magnetic stirring for 2 hours, the solution changed from reddish brown to yellow, and a yellow precipitate appeared. Adjust the pH of the solution to 6.5 with ammonia water, and stir magnetically for 2 hours; according to the molar ratio of bismuth: vanadium: nitric acid: CTAB of 1:1:2.5:0.025, add CTAB to the above yellow solution, and stir magnetically for 2 hours to form BiVO 4 precursors. BiVO 4 The precursors were put into the reactor and treated with hydrothermal treatment at 160°C for 72 hours. After cooling, ...

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Abstract

The invention discloses bismuth vanadate powder and a preparation method thereof. The method comprises the following steps: firstly, bismuth-bearing compounds and vanadium-bearing compounds are respectively dissolved in a nitric acid, mixed and then added with a hexadecyl trimethyl ammonium bromide solution, the mol ratio of bismuth to vanadium to the nitric acid to hexadecyl trimethyl ammonium bromide is 1 to 1 to 2.5 to 0.025, and the mixture is stirred for 1 to 2 hours by magnetic force so as to form a bismuth vanadate precursor; the bismuth vanadate precursor is placed in a reaction kettle, undergoes hydrothermal treatment for 70 to 75 hours at a temperature of between 80 and 200 DEG C, cooled, centrifugally separated, and then added with a saturated sodium chloride solution of anhydrous ethanol and deionized water; ion-exchange is performed after the bismuth vanadate precursor is completely immersed, and then centrifugal separation is performed; and finally the bismuth vanadate precursor is washed for 3 to 5 times by mixture of the deionized water and ethanol, then the bismuth vanadate powder with microspheric and / or micro-flaky particles is prepared. The method has simple operation and mild conditions; and bismuth vanadate powder particles prepared are uniform, have large specific surface area, have the characteristics of good visible light response and high photocatalytic activity, and are suitable for industrialized production.

Description

technical field [0001] The invention relates to a microspherical and / or microflaky bismuth vanadate powder and a preparation method thereof, belonging to the technical field of inorganic materials and photocatalytic oxygen production. Background technique [0002] With the rapid development of the economy, the consumption of fossil energy such as oil and coal is increasing day by day, and human beings are facing the challenge of resource shortage. At the same time, environmental pollution has threatened human survival and development. Therefore, it is extremely urgent to develop clean new energy sources and solve environmental pollution problems. Photocatalytic technology can directly use sunlight to decompose water into clean hydrogen energy, and completely oxidize organic pollutants into water, carbon dioxide and non-toxic and harmless inorganic salts, so it has the potential to solve energy problems and environmental pollution problems. [0003] In the field of photocat...

Claims

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Application Information

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IPC IPC(8): C01G31/00C01G29/00
Inventor 彭天右柯丁宁
Owner WUHAN UNIV
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