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A kind of tungsten oxide core-shell structure composite photocatalyst and its preparation method and application

A core-shell structure and tungsten oxide technology, which is applied in the field of tungsten oxide core-shell structure composite photocatalyst and its preparation, can solve the problems of insufficient reduction ability of photogenerated electrons, low utilization rate of photogenerated charges, high charge recombination rate, etc., to achieve environmental friendliness, High photocatalytic activity and improved separation efficiency

Active Publication Date: 2021-03-02
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conduction band position of pure non-stoichiometric tungsten oxide is too low, and the reduction ability of photogenerated electrons generated is insufficient. At the same time, its internal charge recombination rate is too high, resulting in a low utilization rate of photogenerated charges.

Method used

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  • A kind of tungsten oxide core-shell structure composite photocatalyst and its preparation method and application
  • A kind of tungsten oxide core-shell structure composite photocatalyst and its preparation method and application
  • A kind of tungsten oxide core-shell structure composite photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]A composite photocatalyst with a core-shell structure of tungsten oxide uses a non-stoichiometric tungsten oxide nanocluster as the core and a graphite phase carbon nitride shell is wrapped on its outer layer.

[0040]In this embodiment, the mass percentage of the graphite phase carbon nitride shell in the tungsten oxide core-shell structure composite photocatalyst is 20%.

[0041]In this embodiment, the diameter of the non-stoichiometric tungsten oxide nanoclusters is 100 nm to 120 nm; the thickness of the graphite phase carbon nitride shell is 5 nm to 8 nm.

[0042]In this embodiment, the non-stoichiometric tungsten oxide nanoclusters are grown on the surface of the non-stoichiometric tungsten oxide nanoclusters to form a graphite phase carbon nitride shell by thermal condensation polymerization, thereby forming a composite photocatalyst with a core-shell structure.

[0043]A method for preparing the tungsten oxide core-shell structure composite photocatalyst in the above embodiment inc...

Embodiment 2

[0056]An application of a tungsten oxide core-shell structure composite photocatalyst in the treatment of dye wastewater, specifically adopting a tungsten oxide core-shell structure composite photocatalyst to treat methyl orange wastewater, includes the following steps:

[0057]Weigh 0.5g of the tungsten oxide core-shell structure composite photocatalyst (W18O49@g-C3N4), non-stoichiometric tungsten oxide nanoclusters (W18O49) And the graphite phase carbon nitride (g-C3N4) Nanosheets, add to 50mL of methyl orange wastewater with an initial concentration of 20mg / L under dark conditions, stir for 30 minutes, and after reaching the adsorption equilibrium, place the mixed solution in the photocatalytic reaction device, with AM 1.5 cut-off The 300W xenon lamp of the filter is used as the light source to carry out the photocatalytic reaction for 120 minutes to complete the treatment of the methyl orange wastewater.

[0058]During the photocatalytic reaction, samples were taken every 20 minutes, ...

Embodiment 3

[0064]Investigating the stability of the tungsten oxide core-shell structure composite photocatalyst of the present invention includes the following steps:

[0065](1) Centrifuge the remaining reaction solution after the photocatalytic reaction in Example 2, collect the tungsten oxide core-shell structure composite photocatalyst, wash it with deionized water and absolute ethanol three times, and then place it in an oven at 60°C to dry 12h.

[0066](2) Using the same treatment method as in Example 2, the tungsten oxide core-shell structure composite photocatalyst obtained after drying in step (1) was repeatedly used to treat the methyl orange wastewater, and a total of 3 repeated tests were carried out.

[0067]Figure 8It is a diagram showing the cyclic degradation effect of tungsten oxide core-shell structure composite photocatalyst on methyl orange in Example 3 of the present invention. byFigure 8It can be seen that after three cycles of use, the tungsten oxide core-shell structure composit...

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Abstract

The invention discloses a composite photocatalyst with tungsten oxide core-shell structure and its preparation method and application. The composite photocatalyst is based on W 18 o 49 As the inner core, its surface is covered with a graphitic carbon nitride shell. The preparation method comprises: preparing a dispersion liquid of non-stoichiometric tungsten oxide nanoclusters / urea; removing the solvent in the dispersion liquid, heat-treating the obtained solid, dispersing the obtained compound in deionized water, ultrasonic treatment, centrifugal separation, and drying to obtain the present Invented composite photocatalyst. The composite photocatalyst of the present invention has the advantages of large photoresponse range and high photocatalytic activity. As a new type of photocatalyst, it can be widely used in photocatalytic degradation of pollutants in the environment. For example, it can effectively photocatalytically degrade dyes in wastewater, and has great Good application prospects. The preparation method of the present invention has the advantages of simple process, convenient operation, low cost, less energy consumption, no toxic and harmful substances, environmental friendliness, etc., is suitable for large-scale preparation, and is beneficial to industrial application.

Description

Technical field[0001]The invention belongs to the field of functional composite photocatalysts, and relates to a functional nanomaterial for photocatalytic degradation of environmental pollutants, and in particular to a tungsten oxide core-shell structure composite photocatalyst, and a preparation method and application thereof.Background technique[0002]With the increasing emphasis on environmental protection and renewable energy, people have turned to solar energy, wind energy, hydropower and other clean and renewable energy sources. Therefore, photocatalytic technology has attracted great attention of researchers, and has obtained extensive research and application in the fields of environmental pollutant degradation, solar cells, water splitting hydrogen production, and photocatalytic nitrogen fixation. However, photocatalysts used in photocatalytic technology generally have shortcomings such as narrow photoresponse range and low photogenerated charge utilization. These unfavorab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01J27/24B01J35/00B01J37/34C02F1/30C02F101/38
CPCB01J27/24B01J23/30B01J37/343C02F1/30C02F2305/10C02F2101/40C02F2101/38C02F2101/308B01J35/397B01J35/39
Inventor 汤琳冯程洋曾光明王敬敬刘雅妮欧阳细莲
Owner HUNAN UNIV
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