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Preparation method and application of MoSe2/ZnCdS nanoparticles

A nanoparticle and nanosheet technology, which is used in the preparation of MoSe2/ZnCdS composite materials and in the application field of photocatalytic hydrogen production, can solve the problems of reduced catalytic activity, low surface area, and low electron hole separation efficiency, and achieves excellent results. The effect of hydrogen production performance, wide application, good electrical conductivity

Pending Publication Date: 2020-05-19
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bimetallic sulfide Cd 0.5 Zn 0.5 S, as a typical noble metal-free polymer semiconductor photocatalyst, has good environmental friendliness, good physical and chemical stability, and unique optoelectronic properties, but the surface area is not high, and the electron-hole separation efficiency is low during the photocatalytic reaction. , weak charge carrier mobility and other factors directly lead to the reduction of catalytic activity
Cd 0.5 Zn 0.5 The photocatalytic activity of S photocatalysts is far from meeting the basic requirements for practical applications.

Method used

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  • Preparation method and application of MoSe2/ZnCdS nanoparticles
  • Preparation method and application of MoSe2/ZnCdS nanoparticles
  • Preparation method and application of MoSe2/ZnCdS nanoparticles

Examples

Experimental program
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Effect test

Embodiment 1

[0027] 1) Add 5mmol Zn(Ac) 2 2H 2 O, 5 mmol Cd(Ac) 2 2H 2 O and 12.5 mmol thioacetamide were dissolved in 40 mL distilled water. Then 10 mL of 4M NaOH aqueous solution was added to the above solution under vigorous stirring until a homogeneous solution was formed. The solution was transferred into a Teflon-lined autoclave, and the autoclave was sealed and kept in an oven at 180 °C for 24 h. After the autoclave was naturally cooled at room temperature, the obtained yellow product was collected, centrifuged several times with water and ethanol, and dried in an oven at 60 °C for 8 h. The resulting Zn 0.5 CD 0.5 S solid solution.

[0028] 2) Add 0.304 gNaBH 4 , 0.316 g of Se powder, and 0.57 g of sodium molybdate were dissolved in 75 mL of deionized water, and stirred evenly. The black precipitate was washed three times with deionized water and absolute ethanol, and dried at 60 °C to obtain MoSe 2 Nanosheets.

[0029] 3) Add 5mL of ethanol into a 10ml centrifuge tube, m...

Embodiment 2

[0031] 1) MoSe obtained in Example 1 2 / ZnCdS composite catalyst for visible light photocatalytic hydrogen production.

[0032] Under visible light irradiation, hydrogen production experiments were carried out in a closed quartz reaction system. The temperature of the reaction system was kept at 6 °C by cooling circulating water, and 20 mg of the catalyst was dispersed in 80 mL of lactic acid and deionized aqueous solution (8 mL of lactic acid, 72 mL of water), in which lactic acid was used as a sacrificial agent, and the air was completely removed under continuous stirring, and a 300W Xe arc lamp with a 420 nm filter (CEL-HXF300) was used as a light source, and online gas chromatography (FULI, GC -7920) for hydrogen evolution analysis. After the light starts, samples are taken every 1 hour to get Figure 6 The hydrogen production histogram is shown. It can be concluded that MoSe 2 When the addition amount is 9% MoSe 2 The hydrogen production capacity of the / ZnCdS compos...

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Abstract

The invention relates to a preparation method of MoSe2 / ZnCdS nano-particles and application of the MoSe2 / ZnCdS nano-particles in photocatalytic hydrogen production. The nano-particles are small in size and uniform in dispersion. The invention belongs to the field of nano material preparation technology and energy development. The preparation method comprises following steps: firstly, selenium powder, sodium molybdate and the like are used as raw materials, MoSe2 is synthesized through a hydrothermal method, then Zn<0.5>Cd<0.5>S nanoparticles are synthesized fromzinc acetate, cadmium acetate and other raw materials, and the MoSe2 / ZnCdS composite material is formed through uniform mixing and drying throughultrasonic oscillation method. The nano composite material shows excellent catalytic activity in photocatalytic hydrogen production.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation technology and green energy, and specifically relates to a MoSe 2 Preparation method of / ZnCdS composite material and its application in photocatalytic hydrogen production. Background technique [0002] With the development of human beings, environmental and energy issues are two difficult problems we are currently facing. The excessive exploitation of fossil energy and the deterioration of the environment force people to look for a sustainable and environmentally friendly energy source. Hydrogen is considered to be an ideal energy carrier, and it has the same 2 Environmental friendliness of O as the only oxidation product. In recent years, H through photocatalytic water separation 2 Evolution has come a long way. However, rational design of photocatalysts that can sustainably and effectively respond to visible light remains a challenging task. Bimetallic sulfide Cd 0.5 Zn 0.5 S, as...

Claims

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Application Information

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IPC IPC(8): B01J27/051B01J35/02C01B3/04
CPCB01J27/051C01B3/042C01B2203/1047B01J35/39B01J35/40Y02E60/36
Inventor 乔秀清贾艳琳王紫昭李秋昊
Owner CHINA THREE GORGES UNIV
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