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Preparation method and application of ultrathin tungsten trioxide dihydrate nanosheet

A technology of tungsten trioxide and nanosheets, which is applied in the field of photoelectrochemical materials and photocatalysis, can solve the problems of low yield and achieve the effects of huge application potential, fast photocurrent response, and enhanced catalytic performance

Active Publication Date: 2017-04-19
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently, the reported WO 3 The synthesis method of nanosheets has a low yield or requires special equipment. Therefore, an intercalation-exfoliation method is used to prepare ultra-thin WO 3 Nanosheets can improve photocatalytic performance, be used to efficiently degrade organic pollutants, and produce hydrogen / oxygen by photoelectric water splitting, which is of great significance for environmental governance, effectively improving the utilization rate of sunlight and saving energy

Method used

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  • Preparation method and application of ultrathin tungsten trioxide dihydrate nanosheet
  • Preparation method and application of ultrathin tungsten trioxide dihydrate nanosheet
  • Preparation method and application of ultrathin tungsten trioxide dihydrate nanosheet

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Effect test

Embodiment 1

[0019] (1) Using the precipitation method, add 10mL of 1.0mol / L sodium tungstate solution to 90mL of 3.0mol / L hydrochloric acid solution, stir magnetically in an ice-water bath for 30 minutes, centrifuge the obtained product, and wash it with deionized water for 3 times. Then freeze-dry to obtain dihydrate tungsten trioxide block powder.

[0020] (2) Mix 0.2g of tungsten trioxide dihydrate bulk powder obtained in step (1) with 5mL of n-propylamine evenly, add it into a 25mL polytetrachlorethylene reaction kettle, react at 100°C for 3 days, and cool to room temperature naturally. The sample was centrifuged, washed with distilled water and ethanol three times successively, and then vacuum-dried at 60° C. to obtain an organic-inorganic hybrid intercalated with organic amines.

[0021] (3) Take 0.1 g of the organic-inorganic hybrid obtained in step (2) and add it to 15 mL of 3.0 mol / L acetic acid solution, stir it magnetically in an ice-water bath for 10 hours, and centrifuge for ...

Embodiment 2

[0025] (1) Using the precipitation method, add 10mL of 1.0mol / L sodium tungstate solution to 90mL of 3.0mol / L hydrochloric acid solution, stir magnetically in an ice-water bath for 30 minutes, centrifuge the obtained product, and wash it with deionized water for 3 times. Then freeze-dry to obtain dihydrate tungsten trioxide block powder.

[0026] (2) Mix 0.2g of tungsten trioxide dihydrate powder obtained in step (1) with 10mL of n-butylamine in the liner of a polytetrachlorethylene reactor, react at 120°C for 2 days, cool to room temperature naturally, and centrifuge the sample , successively washed with distilled water and ethanol for 3 times, and then vacuum-dried at 60°C to obtain an organic-inorganic hybrid intercalated with organic amines.

[0027] (3) Get 0.1g step (2) gained organic-inorganic hybrid, join in the tartaric acid solution of 15mL1.0mol / L, after ice-water bath magnetic stirring 6 hours, centrifuge 5 under the rotating speed of 5000 rev / mins with centrifuge ...

Embodiment 3

[0029] (1) Using the precipitation method, add 10mL of 1.0mol / L sodium tungstate solution to 90mL of 3.0mol / L hydrochloric acid solution, stir magnetically in an ice-water bath for 30 minutes, centrifuge the resulting product, and wash it with deionized water for 3 times. Then freeze-dry to obtain dihydrate tungsten trioxide block powder.

[0030] (2) Mix 0.2g of blocky tungsten trioxide dihydrate powder obtained in step (1) and 8mL of n-octylamine evenly, add it to a polytetrachlorethylene reactor, react at 150°C for 2 days, and cool it down to room temperature naturally. The sample was centrifuged, washed three times successively with distilled water and ethanol, and then vacuum-dried at 60°C to obtain an organic-inorganic hybrid intercalated with organic amines.

[0031] (3) Get 0.1g of the organic-inorganic hybrid obtained in step (2), add it to 15mL of 1.5mol / L citric acid solution, stir it magnetically in an ice-water bath for 8 hours, and centrifuge it at a speed of 500...

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Abstract

The invention discloses a preparation method of an ultrathin tungsten trioxide dihydrate nanosheet photocatalyst. The preparation method is characterized in that an organic-inorganic hybrid of an organic amine intercalation is prepared through solvothermal reaction. The preparation method comprises the steps of mixing 10 mL of a sodium tungstate solution of which the concentration is 1.0 mol / L with 90 mL of a hydrochloric acid solution of which the concentration is 3.0 mol / L for reaction, so as to obtain tungsten trioxide dihydrate block powder; mixing tungsten trioxide dihydrate powder with organic amine for reaction for 2 to 3 days at the temperature of 100 DEG C to 150 DEG C, so as to obtain the organic-inorganic hybrid of the organic amine intercalation; then, forming the tungsten trioxide dihydrate ultrathin nanosheet through organic acid liquid phase peeling; and mixing tungsten trioxide dihydrate of the organic amine intercalation with an organic acid solution, and carrying out liquid phase ultrasonic peeling to obtain the tungsten trioxide dihydrate ultrathin nanosheet. The method is simple and convenient in use and easy to operate, and the prepared tungsten trioxide dihydrate ultrathin nanosheet has relatively high photocatalytic activity.

Description

technical field [0001] The technical field of the invention belongs to the technical field of photocatalysis and photoelectrochemical materials, and in particular relates to a preparation method of tungsten trioxide ultrathin nano sheet photocatalyst. Background technique [0002] Tungsten trioxide is an n-type semiconductor material with a wide band gap. The band gap at room temperature is 2.63eV. It can absorb visible light and ultraviolet light below 500nm. It is used in electrochromic, gas sensor, photocatalysis and photoelectric conversion fields. It has important application value. Compared with traditional semiconductor materials, nano-tungsten trioxide has a narrower band gap, good photoelectric response performance under visible light conditions, low price, stable performance, harmless and non-toxic, and can be used as a photocatalyst to utilize sunlight Degrade organic pollutants in water and waste gas in the air, high efficiency, energy saving, clean and pollutio...

Claims

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Application Information

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IPC IPC(8): B01J23/30B82Y40/00C01G41/02
CPCB82Y40/00C01G41/02B01J23/30C01P2004/24C01P2004/04C01P2002/84C01P2002/72C01P2002/01B01J35/39
Inventor 吕慧丹张梦莹刘勇平闫艺杨之书耿鹏
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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