In-situ synthesis method of metal-loaded tungsten trioxide-based nano heterojunction material

A tungsten trioxide, supported metal technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the problem of low conduction band potential, photogenerated electrons and holes recombination high rate problem

Active Publication Date: 2021-07-06
NANTONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, tungsten trioxide also has the problems of high recombination rate of photogenerated electrons and holes and low conduction band potential that are common in other photocatalysts.

Method used

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  • In-situ synthesis method of metal-loaded tungsten trioxide-based nano heterojunction material
  • In-situ synthesis method of metal-loaded tungsten trioxide-based nano heterojunction material
  • In-situ synthesis method of metal-loaded tungsten trioxide-based nano heterojunction material

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Experimental program
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preparation example Construction

[0026] 1. Preparation of blue tungsten oxide

[0027] Add yellow tungsten trioxide and 10%~37% formaldehyde aqueous solution into the quartz photocatalytic reactor, ultrasonically disperse, the concentration of tungsten trioxide in the formaldehyde solution is 0.23~230g / L, 250~400W high-pressure mercury lamp or xenon lamp ultraviolet light 8 ~30min, the blue tungsten oxide is prepared. Centrifugation gave a solid, which was washed with water and ethanol.

[0028] 2. In situ synthesis of metal-loaded tungsten trioxide-based nano-heterojunction materials

[0029] Add 2-25mmol / L metal precursor (chloroauric acid, chloroplatinic acid, palladium chloride or silver nitrate) solution to the blue tungsten oxide prepared by the above method, ultrasonically disperse, the mole of blue tungsten oxide and metal precursor The ratio is 1-10:1, adjust the pH value to 10-11 with NaOH solution, stir magnetically for 30-60 minutes, centrifuge, disperse the solid in 35-70mL ethanol, and solvent...

Embodiment 1

[0031] In this example, yellow tungsten trioxide and 37% formaldehyde aqueous solution are added to a quartz photocatalytic reactor, and ultrasonically dispersed. The concentration of tungsten trioxide in the formaldehyde solution is 1.15g / L, and 300W xenon lamp ultraviolet light is irradiated for 30 minutes, and the blue color is prepared. Tungsten oxide. Centrifugation gave a solid, which was washed with water and ethanol.

[0032] Add 5mmol / L chloroauric acid solution to the blue tungsten oxide prepared by the above method, ultrasonically disperse, the molar ratio of blue tungsten oxide to chloroauric acid is 5:1, adjust the pH value to 10 with NaOH solution, and stir magnetically for 30min , Centrifuge, disperse the solid in 35mL of ethanol, and solvent heat at 150°C for 3h. Centrifuge to obtain a solid, wash with water and ethanol, and dry under vacuum at 60°C for 5 hours to obtain WO 3 - Au nano-heterojunction composites.

[0033] figure 1 and figure 2 WO 3 - Fiel...

Embodiment 2

[0035] In this example, yellow tungsten trioxide and 37% formaldehyde aqueous solution are added to the quartz photocatalytic reactor, ultrasonically dispersed, the concentration of tungsten trioxide in the formaldehyde solution is 2.3g / L, and 400W high-pressure mercury lamp is irradiated with ultraviolet light for 30 minutes, which is prepared. Blue tungsten oxide. Centrifugation gave a solid, which was washed with water and ethanol.

[0036] Add 25mmol / L chloroplatinic acid solution to the blue tungsten oxide prepared by the above method, ultrasonically disperse, the molar ratio of blue tungsten oxide to chloroplatinic acid is 2:1, adjust the pH value to 11 with NaOH solution, and stir magnetically for 60min , Centrifuge, disperse the solid in 70mL ethanol, and heat at 150°C for 4h. Centrifuge to obtain a solid, wash with water and ethanol, and dry under vacuum at 60°C for 5 hours to obtain WO 3 -Pt nano-heterojunction composite material.

[0037] image 3 and Figure 4...

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Abstract

The invention provides an in-situ synthesis method of a metal-loaded tungsten trioxide-based nano heterojunction material. The method comprises the following steps: 1, preparing blue tungsten oxide of which the surface layer contains reductive oxygen vacancies and pentavalent tungsten; and 2, growing metal nanoparticles on the surface of the blue tungsten oxide in situ by utilizing the reducibility of the blue tungsten oxide, so as to obtain the metal-loaded tungsten trioxide-based nano heterojunction composite material. The composite material synthesized through in-situ growth has a tightly-combined heterojunction interface, is high in electron transfer efficiency, can regulate and control an energy band, promotes charge separation and transfer, solves the problems of high recombination rate of tungsten trioxide photo-induced electrons and holes and low conduction potential of the tungsten trioxide, greatly improves the photocatalytic activity and stability of the material, and can be widely applied to the fields of photocatalytic solar fuel preparation, photocatalytic degradation of pollutants and the like.

Description

technical field [0001] The invention belongs to the technical field of high-quality photocatalytic composite materials, and in particular relates to an in-situ synthesis method of a metal-loaded tungsten trioxide-based nano-heterojunction material. Background technique [0002] Energy crisis and environmental pollution are two major challenges facing human society, and photocatalytic technology provides an ideal way to solve energy and environmental problems. Photocatalytic solar fuels and photocatalytic degradation of pollutants have shown important applications in the fields of energy and the environment prospect. However, the realization of large-scale industrial application still needs to solve the bottleneck problems such as the lack of visible light-responsive catalytic materials and the low photocatalytic efficiency caused by the high recombination rate of photogenerated electrons and holes. [0003] Tungsten trioxide is an important n-type semiconductor material wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/652B01J23/68
CPCB01J35/004B01J23/687B01J23/6527
Inventor 赵勤倪雪薇熊秋阁吴雨薇郭虞敏王婧虹杨文娟吴淑澄
Owner NANTONG UNIVERSITY
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