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

Abstract

The invention discloses a tungsten oxide homogeneous junction composite photocatalyst as well as a preparation method and application thereof. The composite photocatalyst is prepared from tungsten oxide nanorods as a carrier on which W18O49 is grown. The preparation method comprises the following steps: dispersing hexacharbonyl tungsten into anhydrous ethanol, performing ultrasonic treatment so asto obtain an ethanol solution of hexacharbonyl tungsten, adding the tungsten oxide nanorods, performing ultrasonic dispersion, and performing a high-temperature reaction on the obtained suspension, so as to obtain the tungsten oxide homogeneous junction composite photocatalyst. The tungsten oxide homogeneous junction composite photocatalyst disclosed by the invention has the advantages of being large in photoresponse range, high in photocatalytic activity, and the like; as a novel photocatalyst, the photocatalyst can be widely used in photocatalytic degradation of pollutants in the environment, is capable of effectively implementing photocatalytic degradation on organic pollutants in wastewater and has very good application prospects; and the preparation method of the tungsten oxide homogeneous junction composite photocatalyst, which is disclosed by the invention, has the advantages of being simple and convenient to operate, low in cost, small in energy consumption, and the like, is applicable to 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...

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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

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