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Tungsten trioxide-molybdenum disulfide type composite photocatalyst, preparation method and applications thereof

A molybdenum disulfide and tungsten trioxide technology, applied in the field of photocatalytic materials, can solve the problems of poor stability, high photo-generated carrier recombination rate, poor light response, etc., and achieve mild operating conditions, environmental friendliness, and low production costs. Effect

Pending Publication Date: 2020-04-10
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the shortcomings of traditional semiconductor photocatalysts such as poor photoresponse, poor stability and high recombination rate of photogenerated carriers, its application in the field of photocatalysis is limited.

Method used

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  • Tungsten trioxide-molybdenum disulfide type composite photocatalyst, preparation method and applications thereof
  • Tungsten trioxide-molybdenum disulfide type composite photocatalyst, preparation method and applications thereof
  • Tungsten trioxide-molybdenum disulfide type composite photocatalyst, preparation method and applications thereof

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preparation example Construction

[0028] The present invention also provides the WO described in the technical solution 3 -MoS 2 The preparation method of type composite photocatalyst comprises the following steps:

[0029] flake MoS 2 Dispersed in alcoholic solvents to obtain MoS 2 Dispersions;

[0030] Dissolving tungsten salt in a solvent to obtain a tungsten salt solution;

[0031] The MoS 2 The dispersion liquid is mixed with the tungsten salt solution to undergo an oxidation reaction to obtain a tungsten trioxide-molybdenum disulfide composite photocatalyst.

[0032] The preparation method provided by the invention has the characteristics of simple process, low cost, no pollution, etc., and can prepare WO with controllable component content, high utilization rate of visible light, efficient and stable photocatalytic decomposition of water to produce hydrogen 3 -MoS 2 composite photocatalyst.

[0033] In the present invention, flake MoS 2 Dispersed in alcoholic solvents to obtain MoS 2 Dispersio...

Embodiment 1

[0049] (1) Take 2g bulk MoS 2 Place in a sealed flat-bottomed flask protected by argon, slowly add 20 mL of n-butyllithium hexane solution with a concentration of 1.6 mol / L with a syringe, stir for 48 hours, centrifuge, and wash with hexane to obtain Li 2.2 MoS 2 ; the Li 2.2 MoS 2 Ultrasonic dispersion in water, sonication at 260W ultrasonic power for 12h, first centrifuged at 2000r / min, the lower layer did not peel off the solid, then centrifuged at 10000r / min to remove the lower solid, washed with water until neutral, freeze-dried to obtain Flake MoS with a thickness of 1-3nm 2 ;

[0050] (2) Take 0.15g of flake MoS obtained in step (1) 2 Ultrasonic dispersion into 50mL of ethylene glycol, another 32.60mg of tungsten chloride was dissolved in 20mL of ethylene glycol and fully stirred, the above MoS 2 The dispersion liquid was mixed with tungsten chloride ethylene glycol solution, stirred well and then transferred into an eggplant-shaped bottle. With the assistance of ...

Embodiment 2

[0053] (1) Take 2g bulk MoS 2 Place in a sealed flat-bottomed flask protected by argon, slowly add 20 mL of n-butyllithium hexane solution with a concentration of 1.6 mol / L with a syringe, stir for 48 hours, centrifuge, and wash with hexane to obtain Li 2.2 MoS 2 ; the Li 2.2 MoS 2 Ultrasonic dispersion in water, ultrasonic 12h at 260W ultrasonic power, first centrifuged at 2000r / min to remove the upper solid, then centrifuged at 10000r / min to remove the lower solid, washed with water until neutral, freeze-dried to obtain the thickness Flake MoS with a thickness of 1-3nm 2 ;

[0054] (2) Take 0.4g of flake MoS obtained in step (1) 2 Ultrasonic dispersion into 50mL of ethylene glycol, another 10.8mg of ammonium metatungstate dissolved in 20mL of water and fully stirred, the above MoS 2 The dispersion liquid was mixed with the ammonium metatungstate aqueous solution, stirred well and then transferred into an eggplant-shaped bottle. With the assistance of 300W microwave, it...

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Abstract

The invention relates to the technical field of photocatalytic materials, particularly to a tungsten trioxide-molybdenum disulfide type composite photocatalyst, a preparation method and applications thereof. The tungsten trioxide-molybdenum disulfide type composite photocatalyst provided by the invention comprises a molybdenum disulfide matrix and tungsten trioxide quantum dots loaded on the surface of the molybdenum disulfide matrix. According to the preparation method, molybdenum disulfide and tungsten trioxide are narrow-band-gap semiconductors, so that the photocatalyst can generate photo-induced electron hole pairs under the excitation of visible light; and the tungsten trioxide quantum dots can absorb visible light and generate photo-induced electrons, and are loaded to the surface of the molybdenum disulfide matrix to form a heterostructure with molybdenum disulfide, so that the separation efficiency of carriers is improved, and the service life of the photo-induced electrons onthe valence band of molybdenum disulfide is prolonged so as to improve the hydrogen production rate of water decomposition under visible light.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to a tungsten trioxide-molybdenum disulfide composite photocatalyst and its preparation method and application. Background technique [0002] Photocatalytic water splitting to produce hydrogen is the most ideal method of hydrogen production. The semiconductor absorbs light energy to generate electrons and holes to stimulate the water splitting reaction. Not only can hydrogen be obtained and no polluting gas is produced during the reaction process, but also solar energy can be converted into chemical energy. Due to the common disadvantages of traditional semiconductor photocatalysts such as poor photoresponse, poor stability, and high recombination rate of photogenerated carriers, their application in the field of photocatalysis is limited. Contents of the invention [0003] The object of the present invention is to provide a tungsten trioxide-molybdenum disulfide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051B01J37/34B01J35/10B82Y30/00B82Y40/00B01J37/12C01B3/04
CPCB01J27/051B01J37/346B01J37/12C01B3/042B82Y30/00B82Y40/00C01B2203/1041C01B2203/0277B01J35/61B01J35/39Y02E60/36
Inventor 白慧白斌白冰马蒙蒙黄伟
Owner TAIYUAN UNIV OF TECH
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