Disulfide composite material as well as preparation method and application thereof

A composite material and sulfide technology, which is applied in the field of photocatalytic hydrogen evolution, can solve the problems of CdS easily falling off photocatalytic effect, lack of mature and perfect solutions, influence and other problems, and achieve good catalytic hydrogen production performance, high stability and regeneration. The effect of performance and simple preparation process

Active Publication Date: 2021-06-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current research, NiS particles are only loaded on the surface of CdS, and the disadvantage of CdS falling off easily makes the photocatalytic effect greatly affected.
[0004] Therefore, how to synthesize a tighter heterojunction between CdS and NiS is still a huge challenge, and there is no mature and perfect solution yet.

Method used

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  • Disulfide composite material as well as preparation method and application thereof
  • Disulfide composite material as well as preparation method and application thereof
  • Disulfide composite material as well as preparation method and application thereof

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preparation example Construction

[0033]One embodiment of the present invention provides a kind of preparation method of double sulfide composite material, comprises the following steps:

[0034] (1) Mix a certain amount of nickel salt solution with a certain amount of ligand solution, carry out an oil bath reflux reaction at a certain temperature, after a certain period of reaction, cool to room temperature, centrifuge, wash and dry to obtain a nickel metal organic framework Material;

[0035] In this step, the nickel salt solution is prepared by dissolving nickel acetate in deionized water, and the ligand solution is prepared by dissolving 2,5-dihydroxyterephthalic acid in deionized water; wherein, nickel acetate and 2 , the mass ratio of 5-dihydroxyterephthalic acid is (5-10):(2-4);

[0036] The reaction temperature of the oil bath reflux reaction is 80-100°C, and the reaction time is 1-2h; the washing is at least twice with deionized water and methanol; the drying is vacuum drying, and the drying temperat...

Embodiment 1

[0047] This embodiment provides a method for preparing a double sulfide composite material, comprising the following steps:

[0048] (1) Dissolve 10g of nickel acetate in 50mL of deionized water, and ultrasonically stir to obtain a uniform nickel salt solution; dissolve 4g of 2,5-dihydroxyterephthalic acid in 150mL of deionized water, and ultrasonically stir to obtain a uniform ligand solution ; Mix the prepared nickel salt solution with the ligand solution, pour it into a glass flask, carry out an oil bath reflux reaction at 100°C, stir and react for 2 hours, cool to room temperature, and centrifuge to obtain a solid precipitate. Use deionized water and methanol After washing for 3 times, vacuum drying at 80°C for 8 hours to obtain nickel metal organic framework (MOF-Ni);

[0049] (2) Dissolve 2g of cadmium acetate in 15mL of DMF, stir ultrasonically until completely dissolved, and obtain a clear cadmium salt solution; disperse 200mg of MOF-Ni obtained in step (1) in the prep...

Embodiment 2

[0053] This embodiment provides a method for preparing a double sulfide composite material, comprising the following steps:

[0054] (1) Dissolve 5g of nickel acetate in 60mL of deionized water, and ultrasonically stir to obtain a uniform nickel salt solution; dissolve 2g of 2,5-dihydroxyterephthalic acid in 120mL of deionized water, and ultrasonically stir to obtain a uniform ligand solution ; Mix the prepared nickel salt solution with the ligand solution, pour it into a glass flask, carry out an oil bath reflux reaction at 80°C, stir and react for 1 hour, cool to room temperature, and centrifuge to obtain a solid precipitate. Use deionized water and methanol After washing for 3 times, vacuum-dry at 70°C for 10 hours to obtain MOF-Ni;

[0055] (2) Dissolve 1 g of cadmium acetate in 25 mL of DMF, stir until it is completely dissolved, and obtain a clear cadmium salt solution; disperse 200 mg of MOF-Ni obtained in step (1) in the prepared cadmium salt solution, and stir for 0.5...

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Abstract

The invention provides a preparation method of a disulfide composite material, the disulfide composite material prepared by the preparation method and application of the disulfide composite material in photocatalytic hydrogen evolution. The disulfide composite material is obtained through coordination reaction-ion exchange-hydrothermal reaction, the preparation process is simple, the cost is low, and industrial application is easy. In the disulfide composite material obtained by the preparation method disclosed by the invention, two sulfides have a tight bonding interface to form a large number of p-n junctions, so that separation and migration of photon-generated carriers are promoted, and the disulfide composite material has good catalytic hydrogen production performance under visible light. In addition, the disulfide composite material obtained by the invention has relatively high stability and renewability.

Description

technical field [0001] The invention relates to the field of photocatalytic hydrogen evolution, in particular to a double sulfide composite material and its preparation method and application. Background technique [0002] Hydrogen is one of the cleanest, non-toxic fuels and a very important chemical raw material in the chemical industry. However, industrial hydrogen is derived from fossil fuels or hydrocarbons such as biomass, which not only consumes a lot of energy but also causes serious environmental pollution. Solar-driven water splitting is considered to be a promising method for hydrogen production in the future. The key to this process is the preparation of highly efficient photocatalysts. [0003] CdS has a suitable band position, and it is considered to be one of the most suitable materials for visible light-driven water splitting. However, problems such as fast recombination of light-induced carriers, limited photoresponse, and severe photocorrosion greatly aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/043B01J37/10B01J37/30B01J37/20C01B3/04
CPCB01J27/043B01J35/004B01J35/0033B01J37/10B01J37/30B01J37/20C01B3/042Y02E60/36
Inventor 阳庆元刘畅飞刘大欢
Owner BEIJING UNIV OF CHEM TECH
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