Preparation method and application of ultra-fine WO3 nanowire

A technology of nanowires and reactors, which is applied in the field of photoelectrochemical materials and photocatalysis, can solve problems such as pollution, complex synthesis routes, and expensive precursors, and achieve large application potential, large quantum confinement effect, and improved photocatalytic performance. Effect

Inactive Publication Date: 2017-02-15
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the preparation of tungsten trioxide ultrafine nanowires mainly adopts bottom-up methods, such as using WCl 6 、[W(CO) 6 ] and other precursors for alcoholysis, these precursors are usually expensive, if you want to use cheap precursors such as sodium tungstate, the synthesis route is complicated
In order to solve these problems, the present invention proposes a solvothermal method with simple process and low cost to prepare ultra-fine tungsten trioxide nanowires. Its outstanding performance can be practically applied in the field of photocatalysis and effectively solve the current social and environmental pollution problems.

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  • Preparation method and application of ultra-fine WO3 nanowire
  • Preparation method and application of ultra-fine WO3 nanowire
  • Preparation method and application of ultra-fine WO3 nanowire

Examples

Experimental program
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Effect test

Embodiment 1

[0018] (1) Weigh 0.1gNa 2 WO 4 2H 2 O with 0.2g (NH 4 ) 2 SO 4 , dissolved in 6mL of deionized water, add 2mL of 0.3mol / L hydrochloric acid solution, stir and mix evenly;

[0019] (2) Measure 5mL cyclohexane and 0.4g oleylamine and mix evenly, pour the obtained transparent mixture into the solution obtained in step (1), stir for 5 minutes to obtain a white milky mixture, pour the mixture into 25mL polytetrafluoroethylene In an ethylene reactor, react at 200°C for 8 hours, and cool to room temperature naturally;

[0020] (3) Add cyclohexane to the reaction kettle that has been cooled to room temperature in step (2) to extract, leave to stand for layering after fully stirring, take the upper layer of blue clear liquid, add ethanol to precipitate the product, and then use a centrifuge to Centrifuge at 10,000 rpm for 15 minutes, remove the supernatant, repeat the treatment with cyclohexane extraction, ethanol precipitation, and centrifugation for 3 times, and dry the centrif...

Embodiment 2

[0023] (1) Weigh 0.05gNa 2 WO 4 2H 2 O with 0.1g (NH 4 ) 2 SO 4 , dissolved in 6mL deionized water, add 2mL 0.1mol / L hydrochloric acid solution, stir and mix evenly;

[0024] (2) Measure 5mL cyclohexane and 0.4g oleic acid and mix evenly, pour the obtained transparent mixture into the solution obtained in step (1), stir for 5 minutes to obtain a white milky mixture, pour the mixture into 25mL polytetrafluoroethylene In an ethylene reactor, react at 150°C for 24 hours, and cool to room temperature naturally;

[0025] (3) Add cyclohexane to the cooled reactor of step (2) for extraction, i.e. leave it to stand for layering after fully stirring, take the upper layer of blue clear liquid, add ethanol to precipitate the product, and then use a centrifuge at 10,000 rpm Centrifuge for 15 minutes at a speed of 1 / min, remove the supernatant, repeat the treatment with cyclohexane extraction, ethanol precipitation, and centrifugation for 3 times, and dry the centrifuged product at 5...

Embodiment 3

[0027] (1) Weigh 0.2gNa 2 WO 4 2H 2 O with 0.4g (NH 4 ) 2 SO 4 , dissolved in 6mL of deionized water, added 2mL of 0.2mol / L hydrochloric acid solution, stirred and mixed evenly;

[0028] (2) Measure 5mL of cyclohexane and 0.4g of octadecylamine and mix evenly, pour the obtained transparent mixture into the solution obtained in step (1), and stir for 5 minutes to obtain a white milky mixture, which is poured into 25mL polytetrafluoroethylene React in vinyl fluoride reactor at 180°C for 12 hours, then cool to room temperature naturally;

[0029] (3) Add cyclohexane to the reaction kettle that has been cooled to room temperature in step (2) for extraction, that is, leave to stand for layering after fully stirring, take the upper layer of blue clear liquid, add ethanol to precipitate the product, and then use a centrifuge to Centrifuge at 10,000 rpm for 15 minutes, remove the supernatant, repeat the treatment with cyclohexane extraction, ethanol precipitation, and centrifugati...

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Abstract

The invention provides a preparation method of an ultra-fine WO3 nanowire. The ultra-fine WO3 nanowire is prepared by virtue of a modified solvothermal method. The method comprises the following steps: weighing 0.05-0.2g of Na2WO4.2H2O and 0.1-0.4g of (NH4)2SO4, dissolving Na2WO4.2H2O and (NH4)2SO4 in 6mL deionized water, adding 2mL of 0.1-0.3mol/L hydrochloric acid solution, and stirring and mixing all ingredients uniformly, thereby obtaining a solution A; taking 5mL of cyclohexane and 0.4g of an organic additive, uniformly mixing cyclohexane with the organic additive so as to obtain a solution B; mixing solution B with the solution A to obtain an emulsion mixture, performing reaction on the emulsion mixture in a high-pressure reaction kettle at a temperature of 150-200 DEG C for 24 hours, and performing extraction, washing and drying, thereby obtaining the ultra-fine WO3 nanowire. The preparation method is low in cost, simple and convenient to operate, realizable based on one step and high in productivity; the prepared ultra-fine WO3 nanowire has relatively high photocatalysis activity and can be used for photocatalytic degradation of organic pollutants.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis and photoelectrochemical materials, in particular to an ultrafine WO 3 Preparation methods of nanowires and their applications. Background technique [0002] Nano tungsten trioxide (WO 3 ) due to its unique structural characteristics and excellent photoelectric and photocatalytic properties have very broad application prospects in the fields of solar cells, semiconductor photoelectric devices, photocatalytic degradation materials, sensor materials, etc., and have attracted extensive attention from many researchers at home and abroad. Compared with traditional semiconductor materials, nano-tungsten trioxide has a narrow band gap (2.5-3.0eV), has good photoelectric response performance under visible light conditions, and is low in price, stable in performance, harmless and non-toxic, and can be used as Photocatalyst, using sunlight to degrade organic pollutants in water and waste gas in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B82Y30/00B82Y40/00C01G41/00C01G41/02
CPCB01J23/30B01J35/004B82Y30/00B82Y40/00C01G41/003C01G41/02C01P2004/16
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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