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Tungsten carbide/cadmium zinc sulfide composite photocatalyst as well as preparation method and application thereof

A technology of tungsten carbide and cadmium sulfide, applied in the field of photocatalytic materials, can solve the problems of low carrier space separation efficiency and high hydrogen production overpotential, and achieve excellent photocatalytic hydrogen production performance

Pending Publication Date: 2020-08-25
CHANGSHA UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For single Zn x Cd 1-x The problem of low carrier space separation efficiency and high hydrogen production overpotential in S,

Method used

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  • Tungsten carbide/cadmium zinc sulfide composite photocatalyst as well as preparation method and application thereof
  • Tungsten carbide/cadmium zinc sulfide composite photocatalyst as well as preparation method and application thereof
  • Tungsten carbide/cadmium zinc sulfide composite photocatalyst as well as preparation method and application thereof

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preparation example Construction

[0030] This embodiment proposes a preparation method of tungsten carbide / cadmium zinc sulfide composite photocatalyst, comprising the following steps:

[0031] S1, dispersing tungsten carbide in water to obtain a suspension;

[0032] S2. Add soluble cadmium salt and soluble zinc salt to the suspension according to the molar mass ratio of cadmium to zinc of 1:10 to 10:1, and then add the concentration to 0.0001mol L -1 ~10mol·L -1 Sodium hydroxide and / or a concentration of 0.0001mol L -1 ~10mol·L -1 Potassium hydroxide adjusts the pH value to 4-10, and stirs evenly; the soluble cadmium salt is cadmium acetate; and / or, the soluble zinc salt is zinc acetate;

[0033] S3, according to the total molar mass ratio of the cadmium in the soluble cadmium salt and the zinc of the soluble zinc salt to the molar mass ratio of sulfur in the sodium sulfide solution and / or potassium sulfide solution 1:1-2, according to the obtained W in the tungsten carbide / cadmium zinc sulfide composite ...

Embodiment 1

[0038] A preparation method of tungsten carbide / cadmium zinc sulfide composite photocatalyst, comprising the following steps:

[0039] S1. Weigh 7.250 mg of tungsten carbide and ultrasonically disperse it in 100 mL of deionized water to obtain a suspension of tungsten carbide;

[0040] S2, the cadmium acetate of 0.7996g and the zinc acetate of 0.6585g are added in the suspension, after stirring evenly, the gained suspension is mixed with NaOH solution (0.2mol L -1 ) to adjust the pH to 7; stir for half an hour until uniform;

[0041] S3, add 12mLNa dropwise 2 S solution (0.5mol·L -1 ), after stirring at 30°C for 18h, the resulting precipitate was collected, washed with absolute ethanol and deionized water several times and then dried to obtain W y C z W content is 1wt% y C z / Zn x Cd 1-x S composite photocatalyst.

Embodiment 2

[0043] A preparation method of tungsten carbide / cadmium zinc sulfide composite photocatalyst, comprising the following steps:

[0044] S1. Weigh 14.5 mg of tungsten carbide and ultrasonically disperse it in 100 mL of deionized water to obtain a suspension of tungsten carbide;

[0045] S2, the cadmium acetate of 0.7996g and the zinc acetate of 0.6585g are added in the suspension, after stirring evenly, the gained suspension is mixed with NaOH solution (0.2mol L -1 ) to adjust the pH to 7. Stir for half an hour until uniform;

[0046] S3, add 12mLNa dropwise 2 S solution (0.5mol·L -1 ). After stirring at 30 °C for 18 h, the resulting precipitate was collected, washed with absolute ethanol and deionized water several times, and dried to obtain W y C z W content is 2wt% y C z / Zn xC d 1-x S composite photocatalyst.

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Abstract

The invention relates to a tungsten carbide / cadmium zinc sulfide composite photocatalyst as well as a preparation method and application thereof. The method comprises the following steps: S1, dispersing tungsten carbide in water to obtain turbid liquid; S2, adding soluble cadmium salt and soluble zinc salt into the turbid liquid according to a molar mass ratio of cadmium to zinc of 1: 10-10: 1, then adjusting the pH value to 4-10, and uniformly performing stirring; S3, adding the sodium sulfide solution or the potassium sulfide solution into the turbid liquid according to a ratio of the totalmolar mass of cadmium in the soluble cadmium salt and zinc in the soluble zinc salt to the molar mass of sulfur in the sodium sulfide solution and / or the potassium sulfide solution being 1: 1 to 1-2;continuously performing stirring to obtain a tungsten carbide / cadmium zinc sulfide composite photocatalyst. The tungsten carbide / cadmium zinc sulfide composite photocatalyst has excellent photocatalytic hydrogen production performance. The invention also comprises application of the composite photocatalyst in preparation of hydrogen by decomposing water.

Description

technical field [0001] The invention relates to the field of photocatalytic materials, in particular to a composite photocatalyst of tungsten carbide / cadmium zinc sulfide and its preparation method and application. Background technique [0002] With the emergence of problems such as global energy shortage and environmental pollution, the development and utilization of new energy sources has become a topic of great concern in today's era. Due to the advantages of inexhaustible, clean, non-polluting, and renewable solar energy, it has potential economic benefits to use semiconductor photocatalysts to convert light energy into chemical energy. [0003] Zn x Cd 1－x S nanomaterial is a very typical II-VI ternary metal sulfide, which is mainly based on ZnS having a similar lattice structure and the same coordination mode as CdS. x Cd 1－x S solid solution. The positions of its valence and conduction bands can be precisely tuned by changing the molar ratio of zinc to cadmium, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22C01B3/04
CPCB01J27/22C01B3/042C01B2203/0277C01B2203/1094B01J35/39Y02E60/36
Inventor 冯文辉周梅胡雯婷张世英
Owner CHANGSHA UNIVERSITY
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