Tungsten oxide composite material and preparation method and application thereof

A composite material, tungsten oxide technology, applied in the field of nanomaterials, can solve the problems of hindering the reductive reaction and low photocatalytic activity, and achieve the effect of a large range of options, a variety of types, and fine particles.

Pending Publication Date: 2022-04-26
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] WO 3 The narrow bandgap structure ensures that it has an extended spectral response, which can effectively use the visible light part of natural light and greatly improve the utilization rate of sunlight, but on the other hand, it also has adverse effects, such as the photogenerated electrons of the narrow bandgap structure- Hole pair recombination is fast, photocatalytic activity is not high; and WO 3 The lower conduction band position may also hinder the reduction reaction

Method used

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  • Tungsten oxide composite material and preparation method and application thereof
  • Tungsten oxide composite material and preparation method and application thereof
  • Tungsten oxide composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Weigh 0.0125mmol Na 2 WO 4 2H 2 O, dissolved in 90ml of pure water, fully stirred and dissolved to form solution A; weighed 0.1mol NaCl, dissolved in 20ml of pure water, fully stirred and dissolved to form solution B; solution A was continuously stirred by magnetic force, and added to solution B drop by drop , then adjust the mixed solution to pH = 2 with 2.5M HCl (aq), then put it into an autoclave, conduct a hydrothermal reaction at 180°C for 9 hours, cool to room temperature, wash with deionized water and ethanol, and centrifuge (3000r / min ) after multiple times, dry at 60°C for 12h to obtain a hydrothermal sample WO, such as figure 1 as shown in a.

[0052] Weigh 0.003mol Bi(NO 3 ) 3 ·5H 2 O was dissolved in 60ml of ethylene glycol, stirred at room temperature for 30 minutes, 0.12 g of EDTA was added to it, and after fully stirred at room temperature for 60 minutes, 0.7 g of WO prepared by the above-mentioned hydrothermal method was added. In the kettle, reac...

Embodiment 2

[0058] The preparation process of the composite product is the same as in Example 1. This example is mainly used to illustrate one of the dual functions of the prepared composite product—the application effect of photocatalytic degradation of organic dye MB.

[0059] Disperse 10mg of the composite product in 100ml of 10mg / L MB solution, stir for 30min under dark conditions, and reach adsorption equilibrium; then place it on a xenon lamp device (420nm filter, 20A current), and simulate MB under visible light under constant stirring During the degradation process, samples were taken at a fixed time period, and the MB content in the solution was detected after centrifugation, and the degradation efficiency of the product corresponding to a certain period of time was calculated. The final degradation effect is as Figure 5 As shown, it can be seen that the composite product has a good degradation effect on MB, reaching 95% at 210 min.

Embodiment 3

[0064] The preparation process of the composite product is the same as in Example 1, and this example is mainly used to illustrate the second dual function of the prepared composite product—the application effect of SERS detection of the organic dye MB.

[0065] Take an appropriate amount of composite products, and evenly disperse them in a concentration range of 10 -3 M-10 -8 A mixed solution is formed in the MB solution of M, and 20 μL of the mixed solution is added dropwise to 2*2cm 2 On the substrate, the SERS detection is carried out immediately after drying, and the enhancement of the Raman signal peak of the pollutant by the material is obtained under the excitation wave of 532nm. The final signal peak as Figure 7As shown, it can be seen that as the concentration of the solution decreases, the intensity of the characteristic peaks also gradually decreases until 10 -8 M, 1622 and 1395cm -1 The characteristic peaks at can still be discerned, indicating that the mater...

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Abstract

The invention relates to the technical field of nanometer materials, in particular to a tungsten oxide composite material and a preparation method and application thereof.The preparation method of the tungsten oxide composite material comprises the steps that a NaCl solution and a sodium tungstate solution are mixed, pH is adjusted, a hydrothermal reaction is conducted, and a nanometer WO3 core material is obtained; and then mixing a bismuth nitrate solution with the nano WO3 core material, and carrying out solvothermal reaction. The preparation method of the tungsten oxide composite material provided by the invention is green, environment-friendly, stable, reliable, simple, convenient, feasible and high in controllability, and the obtained composite material is uniform in size, fine in morphology and convenient to apply. The tungsten oxide composite material prepared by the invention has dual functions of photocatalytic degradation and SERS (Surface Enhanced Raman Scattering) detection at the same time, and is excellent in dual-function application performance and remarkable in effect.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a tungsten oxide composite material and a preparation method and application thereof. Background technique [0002] With environmental pollution and ecological damage, the treatment of water, air, soil and other pollutants has become a serious problem to be solved. Especially since the industrialization, a large number of factories and farms have been discharged without treatment, which contains a large amount of harmful substances to human beings. and other biohazardous organic pollutants. As a modern green and energy-saving technology, photocatalytic technology has shown great potential in wastewater treatment, and has gradually become a research hotspot in the field of environmental protection. Among many photocatalysts, tungsten trioxide (WO 3 ), as an n-type semiconductor material, is a cheap and stable transition metal oxide with unique physical and chemical propert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31B01J37/10C02F1/30G01N21/65C02F101/30
CPCB01J23/31B01J35/004B01J35/0013B01J37/10C02F1/30G01N21/658C02F2305/10C02F2101/308
Inventor 席晓丽赵林艳刘阳思沈越岗聂祚仁
Owner BEIJING UNIV OF TECH
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