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A kind of tungsten oxide homojunction composite photocatalyst and its preparation method and application

A technology of tungsten oxide and composite light, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. Problems such as high hole recombination rate and hindrance to interface charge separation can achieve the effects of industrial application, large photoresponse range, and improved photocatalytic ability

Active Publication Date: 2020-12-04
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Non-stoichiometric tungsten oxide (W 18 o 49 ) as an emerging semiconductor photocatalyst, its unique LSPR absorption under infrared light provides the possibility to realize full-spectrum response photocatalysis, but due to the W 18 o 49 The photogenerated electron-hole recombination rate is too high, and the photogenerated electron-hole generated by it is difficult to be effectively utilized
At present, the commonly used method to promote the separation of photogenerated electrons and holes is to construct a heterojunction photocatalyst. However, the contact interface of different components in the heterojunction structure has a large charge transfer resistance, which will hinder the interface to a certain extent. charge separation between

Method used

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  • A kind of tungsten oxide homojunction composite photocatalyst and its preparation method and application
  • A kind of tungsten oxide homojunction composite photocatalyst and its preparation method and application
  • A kind of tungsten oxide homojunction composite photocatalyst and its preparation method and application

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Embodiment 1

[0036] A kind of tungsten oxide homojunction composite photocatalyst, with tungsten oxide (WO 3 ) nanorods as the carrier, and non-stoichiometric tungsten oxide (W 18 o 49 ) nano branch.

[0037] In this embodiment, the mass ratio of tungsten oxide nanorods to non-stoichiometric tungsten oxide branches is 5:4.

[0038] In this embodiment, the diameter of the tungsten oxide nanorods in the tungsten oxide homojunction composite photocatalyst is 200 nm; the non-stoichiometric tungsten oxide nano-branches are fibrous, and the diameter of the non-stoichiometric tungsten oxide nano-branches is 5 nm.

[0039] In this embodiment, non-stoichiometric tungsten oxide nanobranches are grown on the surface of tungsten oxide nanorods by solvothermal in-situ epitaxial growth to form a tungsten oxide homojunction composite photocatalyst.

[0040] A method for preparing the tungsten oxide homojunction composite photocatalyst in the above-mentioned present embodiment, comprising the following s...

Embodiment 2

[0051] An application of a tungsten oxide homojunction composite photocatalyst in the treatment of organic wastewater, specifically using a tungsten oxide homojunction composite photocatalyst to treat 2,4-dichlorophenol wastewater, comprising the following steps:

[0052] Take respectively the tungsten oxide homojunction composite photocatalyst (WO) that 0.5g embodiment 1 makes 3 @W 18 o 49 ), tungsten oxide nanorods (WO 3 ) 2,4-dichlorophenol wastewater, added to 50mL of 2,4-dichlorophenol wastewater with an initial concentration of 20mg / L under light-shielding conditions, stirred for 30min, and the mixture was placed in a photocatalytic In the reaction device, a 300W xenon lamp was used as the light source to carry out photocatalytic reaction for 60 minutes to complete the treatment of 2,4-dichlorophenol wastewater.

[0053] During the photocatalytic reaction, samples were taken every 10 minutes, the samples were centrifuged, the supernatant was taken, and the concentrati...

Embodiment 3

[0059] Investigate the stability of the tungsten oxide homojunction composite photocatalyst of the present invention, comprise the following steps:

[0060] (1) Centrifuge the remaining reaction solution after the photocatalytic reaction in Example 2, collect the tungsten oxide homojunction composite photocatalyst, wash it three times with deionized water and absolute ethanol, and then place it in a 60°C oven to dry 12h.

[0061] (2) Adopt the same treatment method as in Example 2, repeatedly use the tungsten oxide homojunction composite photocatalyst obtained after drying in step (1) to treat 2,4-dichlorophenol wastewater, and repeat 5 times in total test.

[0062] Figure 6 It is a cyclic degradation effect diagram of 2,4-dichlorophenol by the tungsten oxide homojunction composite photocatalyst in Example 3 of the present invention. Depend on Figure 6 It can be seen that after 5 cycles of use, the removal rate of 2,4-dichlorophenol in the tungsten oxide homojunction com...

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Abstract

The invention discloses a tungsten oxide homojunction composite photocatalyst and its preparation method and application. The composite photocatalyst uses tungsten oxide nanorods as a carrier, and W is grown on the tungsten oxide nanorods. 18 O 49 . The preparation method includes the following steps: dispersing tungsten hexacarbonyl in absolute ethanol and ultrasonic to prepare an ethanol solution of tungsten hexacarbonyl, adding tungsten oxide nanorods, ultrasonic dispersion, and performing a high-temperature reaction on the resulting suspension to obtain homogeneous tungsten oxide. composite photocatalyst. The tungsten oxide homojunction 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 for photocatalytic degradation of pollutants in the environment, such as effective photocatalytic degradation of waste water. of organic pollutants and has good application prospects. The preparation method of the tungsten oxide homojunction composite photocatalyst of the present invention has the advantages of simple operation, low cost, low energy consumption, 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 tungsten oxide composite photocatalyst and its preparation method and application, in particular to a tungsten oxide homojunction composite photocatalyst and its preparation method and application. Background technique [0002] Thanks to its low cost, low energy consumption, and sustainability, photocatalytic technology has attracted widespread attention in the direction of environmental pollution control. However, most photocatalysts are limited by their own high photogenerated electron-hole ratio, narrow light absorption range, etc., and their photocatalytic effect is difficult to meet the actual demand. Therefore, it is necessary to design photocatalysts with broad spectral response and efficient electron-hole separation. [0003] Non-stoichiometric tungsten oxide (W 18 o 49 ) as an emerging semiconductor photocatalyst, its unique LSPR absorption under infr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01J35/00B01J37/34C02F1/30C02F101/34C02F101/36
CPCB01J23/30B01J37/343C02F1/30C02F2101/36C02F2101/345C02F2305/10B01J35/39
Inventor 汤琳冯程洋曾光明王佳佳刘雅妮
Owner HUNAN UNIV
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