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Silver-copper-tungsten oxide photochromic composite nano material and preparation method thereof

A composite nanomaterial and photochromic technology, which is applied in the direction of color-changing fluorescent materials, chemical instruments and methods, catalyst activation/preparation, etc., can solve problems such as insufficient potential, low photocatalytic activity, and low conduction band energy level. Achieve excellent visible light absorption, strong photochromic performance, and fast photochromic effects

Pending Publication Date: 2021-12-31
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure WO 3 still have some disadvantages, such as the lower conduction band energy level cannot provide enough potential to react with strong electron acceptors, and directly lead to fast recombination and lower photocatalytic activity

Method used

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  • Silver-copper-tungsten oxide photochromic composite nano material and preparation method thereof
  • Silver-copper-tungsten oxide photochromic composite nano material and preparation method thereof
  • Silver-copper-tungsten oxide photochromic composite nano material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0036] (1) Preparation of copper-tungsten oxide by hydrothermal reaction: Weigh 0.4948g of sodium tungstate hydrate (Na 2 WO 4 2H 2 (2) and the glycine of 0.0025g are dissolved in the deionized water of 32ml, measure copper nitrate solution (Cu:WO 3 The molar ratio is 1% in turn. Weigh 0.072g of copper nitrate (dissolved in 100ml of deionized water) 5ml, slowly dropwise mix with the above solution respectively, stir evenly to make it completely dissolved. Then, 3ml of 2M hydrochloric acid was added dropwise, and heated in a water bath at 90°C for 30min. Then transfer the above mixed solution to a 50mL polytetrafluoroethylene-lined high-pressure hydrothermal reactor, and react at a high temperature of 150°C for 5h. After the reactor was taken out and cooled to room temperature naturally, the precipitate was collected by centrifugation at a speed of 4000 rpm for 3 minutes, washed alternately with absolute ethanol and deionized water for 3 times, dried at 80°C for 5 hours, an...

Embodiment 2

[0039] (1) Preparation of copper-tungsten oxide by hydrothermal reaction: Weigh 0.4948g of sodium tungstate hydrate (Na 2 WO 4 2H 2 (2) and the glycine of 0.0025g are dissolved in the deionized water of 32ml, measure copper nitrate solution (Cu:WO 3 The molar ratio is 1% in turn. Weigh 0.072g of copper nitrate (dissolved in 100ml of deionized water) 5ml, slowly dropwise mix with the above solution respectively, stir evenly to make it completely dissolved. Then, 3ml of 2M hydrochloric acid was added dropwise, and heated in a water bath at 90°C for 30min. Then transfer the above mixed solution to a 50mL polytetrafluoroethylene-lined high-pressure hydrothermal reactor, and react at a high temperature of 150°C for 5h. After the reactor was taken out and cooled to room temperature naturally, the precipitate was collected by centrifugation at a speed of 4000 rpm for 3 minutes, washed alternately with absolute ethanol and deionized water for 3 times, dried at 80°C for 5 hours, an...

Embodiment 3

[0042] (1) Preparation of copper-tungsten oxide by hydrothermal reaction: Weigh 0.4948g of sodium tungstate hydrate (Na 2 WO 4 2H 2 (2) and the glycine of 0.0025g are dissolved in the deionized water of 32ml, measure copper nitrate solution (Cu:WO 3 The molar ratio is 1% in turn. Weigh 0.072g of copper nitrate (dissolved in 100ml of deionized water) 5ml, slowly dropwise mix with the above solution respectively, stir evenly to make it completely dissolved. Then, 3ml of 2M hydrochloric acid was added dropwise, and heated in a water bath at 90°C for 30min. Then transfer the above mixed solution to a 50mL polytetrafluoroethylene-lined high-pressure hydrothermal reactor, and react at a high temperature of 150°C for 5h. After the reactor was taken out and cooled to room temperature naturally, the precipitate was collected by centrifugation at a speed of 4000 rpm for 3 minutes, washed alternately with absolute ethanol and deionized water for 3 times, dried at 80°C for 5 hours, an...

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Abstract

The invention discloses a silver-copper-tungsten oxide photochromic composite nano material and a preparation method thereof, ordered tungsten oxide (WO3) in which copper is uniformly inserted into crystal lattices is prepared by a simple hydrothermal method, and then silver is loaded on a copper-tungsten oxide nano material by a water bath heating, stirring and dipping method; and therefore, the silver-copper-tungsten oxide composite material which is formed by agglomeration of a plurality of nanorod clusters and is in a microsphere shape is prepared. Due to the interface charge transfer represented by the metal copper and the surface plasma resonance effect of the noble metal silver, the silver-copper co-doped tungsten oxide shows more excellent visible light absorption and stronger photochromic performance. Compared with the prior art, the copper silver-copper-tungsten oxide high-efficiency photochromic composite nano material has the advantages that due to co-doping of tungsten oxide, silver and copper; therefore, the material has excellent visible light absorption and high-efficiency photochromic performance, and meanwhile, a novel visible light driven WO3-based photocatalyst is provided for photocatalytic solar energy conversion.

Description

technical field [0001] The invention belongs to the field of novel environmental protection functional materials, in particular to a silver-copper-tungsten oxide high-efficiency photochromic composite nano material and a preparation method thereof. Background technique [0002] Photocatalytic solar energy conversion is considered to be one of the most promising solutions to environmental problems and energy shortage crises. Metal oxide semiconductors have been extensively studied as efficient photocatalysts. However, many metal oxides have wide band gaps, which limit their absorption of visible light. For example, titanium dioxide, as one of the most frequently studied photocatalysts, absorbs only 5% of the solar spectrum due to its wide bandgap of 3.2 eV and shows low quantum yield. To address these issues, several visible-light-driven photocatalysts have been successfully sought in recent years. Among these visible light photocatalysts, tungsten oxide (WO 3 ) is consid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K9/00B01J23/89B01J37/10B82Y20/00B82Y40/00
CPCC09K9/00B01J23/8993B01J37/10B82Y20/00B82Y40/00B01J35/39
Inventor 鲁逸人魏亚丹董旭刘宪华童银栋常玺德刘翔
Owner TIANJIN UNIV
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