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Praseodymium doped bismuth tungstate photocatalyst and preparation method thereof

A bismuth tungstate and catalyst technology, applied in the field of photocatalysis, can solve the problems of difficult to control the final shape of the product, increase the production cost of the catalyst, etc., and achieve the effects of good crystallinity and visible light catalytic activity, good consistency and uniform structure

Inactive Publication Date: 2018-05-04
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the composite method increases the production cost of the catalyst, and the method of adding a surfactant is not easy to control the final shape of the product. Therefore, a bismuth tungstate nanopowder with a simple preparation process, uniform microstructure and good dispersion is developed to improve its optical properties. Catalytic efficiency plays a positive role in promoting the long-term development of bismuth tungstate in the field of photocatalysis

Method used

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  • Praseodymium doped bismuth tungstate photocatalyst and preparation method thereof
  • Praseodymium doped bismuth tungstate photocatalyst and preparation method thereof
  • Praseodymium doped bismuth tungstate photocatalyst and preparation method thereof

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preparation example Construction

[0018] A kind of preparation method of praseodymium doped bismuth tungstate photocatalyst, it is the following steps:

[0019] (1) Dissolve 200-500 μL of nitric acid in 20-60 mL of deionized water, seal and stir for 10-30 minutes to obtain a nitric acid solution, and add 0.5-2.0 grams of Bi(NO 3 ) 3 ·5H 2 O was dissolved in nitric acid solution, sealed and stirred for 10-30 minutes to obtain bismuth nitrate acidic solution;

[0020] (2) Add 0.5 to 2.0 grams of Na 2 WO 4 2H 2 O was dissolved in 20-60mL deionized water, stirred for 10-30min to obtain a sodium tungstate solution, and the sodium tungstate solution was added dropwise to the bismuth nitrate acidic solution, sealed and stirred for 10-30min to obtain a mixed solution, and then 0.01-0.03 g Pr(NO 3 ) 3 ·6H 2 Dissolve O in the mixed solution, seal and stir for 10-30 minutes;

[0021] (3) Transfer the solution obtained in step (2) to a high-pressure reactor, keep it warm at 120-200°C for 12-24 hours, cool down to...

Embodiment 1

[0023] (1) Dissolve 200 μL of nitric acid in 30 ml of deionized water, seal and stir for 30 minutes;

[0024] (2) 1.0 g of Bi(NO 3 ) 3 ·5H 2 O was dissolved in the solution obtained in step (1), sealed and stirred for 30 minutes;

[0025] (3) 0.6 g Na 2 WO 4 2H 2 O was dissolved in 30 ml of deionized water and stirred for 20 minutes;

[0026] (4) Add the solution obtained in step (3) dropwise to the solution obtained in step (2), seal and stir for 15 minutes;

[0027] (5) 0.01 g of Pr(NO 3 ) 3 ·6H 2 O was dissolved in the solution obtained in step (4), sealed and stirred for 30 minutes;

[0028] (6) The solution obtained in step (5) was transferred to an autoclave, kept at 180° C. for 12 hours, and cooled naturally to room temperature.

[0029] (7) The reaction product was filtered, centrifuged, washed 4 times with absolute ethanol, and dried at 60° C. for 8 hours.

[0030] Such as figure 1 Shown in (a) is the XRD pattern of the dried praseodymium-doped bismuth tu...

Embodiment 2

[0034] (1) Dissolve 200 μL of nitric acid in 30 ml of deionized water, seal and stir for 30 minutes;

[0035] (2) 1.0 g of Bi(NO 3 ) 3 ·5H 2 O was dissolved in the solution obtained in step (1), sealed and stirred for 30 minutes;

[0036] (3) 0.6 g Na 2 WO 4 2H 2 O was dissolved in 30 ml of deionized water and stirred for 20 minutes;

[0037] (4) Add the solution obtained in step (3) dropwise to the solution obtained in step (2), seal and stir for 15 minutes;

[0038] (5) 0.02 gram of Pr(NO3)3.6H2O was dissolved in the solution obtained in step (4), sealed and stirred for 30 minutes;

[0039](6) The solution obtained in step (5) was transferred to an autoclave, kept at 200° C. for 12 hours, and cooled naturally to room temperature.

[0040] (7) The reaction product was filtered, centrifuged, washed 4 times with absolute ethanol, and dried at 60° C. for 8 hours.

[0041] (8) Add 30 mg of sample to a quartz tube with 250 ml of 10 mg / L methyl orange solution. Stir for 3...

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Abstract

The invention discloses a praseodymium doped bismuth tungstate photocatalyst and a preparation method thereof. The praseodymium doped bismuth tungstate photocatalyst is of a three-dimensional flower-shaped structure accumulated by flakes, wherein the thickness of the flakes is 50-80nm; the diameter of flower-shaped granules is 2-4mu m; the crystal structure of the photocatalyst is of an orthorhombic phase. The preparation method comprises the following steps: dissolving bismuth nitrate into a solution, sealing, and stirring so as to obtain a mixed solution; further dissolving praseodymium nitrate into the mixed solution, sealing, and stirring; transferring the obtained solution into a high-pressure reaction kettle, keeping the temperature at 120-200 DEG C, naturally cooling to the room temperature, filtering, performing centrifugal separation, washing with absolute ethyl alcohol, and drying at 60-80 DEG C. The praseodymium doped bismuth tungstate photocatalyst is low in cost, the obtained product is good in consistency, no extra surfactant is needed, and an obtained praseodymium doped bismuth tungstate product is of the three-dimensional flower-shaped structure accumulated by flakes, and is good in dispersibility and visible light catalysis effect.

Description

technical field [0001] The invention relates to a praseodymium-doped bismuth tungstate photocatalyst and a preparation method thereof, belonging to the technical field of photocatalysis. Background technique [0002] Bismuth Tungstate Bi 2 WO 6 It is an Aurivillius-type oxide with a layered structure, and its atomic layers are compact and easy to form a regular sheet structure. Its forbidden band is narrow, about 2.7eV, and it can be excited by absorbing part of visible light. It has high application value in the fields of pollutant degradation and new energy development. Moreover, the bismuth tungstate photocatalytic material has good stability and no toxic side effects. It is an environmentally friendly material and has received extensive attention in the field of photocatalytic materials in recent years. However, Bi 2 WO 6 The visible light response range is narrow, the photogenerated electron-hole recombination is very easy, and the photogenerated carrier life is sh...

Claims

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Application Information

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IPC IPC(8): B01J23/31B01J35/00B01J35/02B01J37/10
CPCB01J23/002B01J23/31B01J37/10B01J2523/00B01J35/00B01J35/30B01J35/39B01J2523/3718B01J2523/54B01J2523/69
Inventor 熊娟顾豪爽田沛沛徐婵阳柳万方成
Owner HUBEI UNIV