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Preparation method and aplication of supported photocatalyst NiSe2/CdS

A photocatalyst, supported technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of easy recombination and high cost of charge carriers, and achieve simple preparation process and conditions. mild effect

Active Publication Date: 2019-09-27
FUZHOU UNIV
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to construct NiSe 2 Co-catalyst modified NiSe 2 / CdS heterojunction photocatalyst, and explore its activity in the photocatalytic water splitting hydrogen production reaction, in order to solve the high cost problem caused by the easy recombination of charge carriers and noble metal modification of CdS in the photocatalytic water splitting hydrogen production reaction

Method used

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  • Preparation method and aplication of supported photocatalyst NiSe2/CdS
  • Preparation method and aplication of supported photocatalyst NiSe2/CdS
  • Preparation method and aplication of supported photocatalyst NiSe2/CdS

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preparation example Construction

[0017] The preparation steps of the present invention are as follows:

[0018] Preparation of CdS nanometers: Weigh 12.5 mmol of cadmium nitrate tetrahydrate and 37.5 mmol of thiourea into a 100 mL reactor lining, add 60 ml of ethylenediamine and stir to dissolve, then seal it in the autoclave , heated to 160 °C in an electric blast drying oven and kept for 24 h. After cooling down to room temperature, the precipitate was centrifuged, washed several times with water and ethanol, and dried in a vacuum oven at 80 °C for 8 h to obtain CdS nanorods.

[0019] Preparation of NaHSe solution: Weigh 2.857 g of sodium hydroxide and 0.228 g of selenium powder into a 50ml reaction kettle, add 25ml of deionized water and stir for 0.5 h, then seal it in a high-pressure reaction kettle, and place it in an electric blast drying oven Heat to 180 °C and keep it warm for 12 h, and wait for it to cool down to room temperature for later use.

[0020] Dissolve a certain amount of nickel nitrate h...

Embodiment 1

[0022] Dissolve a certain amount of nickel nitrate hexahydrate, trisodium citrate (27.69 μmolL trisodium citrate, the molar ratio of the former two is 1:1) and quantitative hexamethylenetetramine (0.25 mmol) in 40 mL of deionized water , then add 200 mg of CdS powder, ultrasonically disperse evenly, then transfer to the autoclave, keep at 120 °C for 12 h, and finally cool down to room temperature naturally; then add 0.719 ml of the prepared NaHSe solution into the above reaction autoclave The samples were kept at 140 °C for 12 h, and then naturally cooled to room temperature. The obtained samples were centrifuged with deionized water and absolute ethanol, and dried in a vacuum oven to obtain NiSe 2 NiSe with a loading of 3 wt% 2 / CdS(NS 3 ) heterojunction photocatalysts. Accurately weighed 5 mg of the synthesized powder catalyst was placed in a photo-splitting water reactor to test the hydrogen production performance of photo-splitting water.

Embodiment 2

[0024] Dissolve a certain amount of nickel nitrate hexahydrate, trisodium citrate (46.15 μmolL trisodium citrate, the molar ratio of the former two is 1:1) and quantitative hexamethylenetetramine (0.25 mmol) in 40 mL of deionized water , then add 200 mg of CdS powder, ultrasonically disperse evenly, transfer to the autoclave, keep at 120 °C for 12 h, and finally cool down to room temperature naturally; then add 1.199 ml of prepared NaHSe solution into the autoclave after the above reaction The samples were kept at 140 °C for 12 h, and then naturally cooled to room temperature. The obtained samples were centrifuged with deionized water and absolute ethanol, and dried in a vacuum oven to obtain NiSe 2 NiSe with a loading of 5 wt% 2 / CdS(NS 5 ) heterojunction photocatalysts. Accurately weighed 5 mg of the synthesized powder catalyst was placed in a photo-splitting water reactor to test the hydrogen production performance of photo-splitting water.

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Abstract

The invention belongs to the field of preparation and application of photocatalysts, and relates to a visible-light-driven NiSe2-based heterojunction photocatalyst for producing hydrogen through efficient photocatalytic water splitting. The NiSe2 / CdS heterojunction photocatalyst is synthesized through a second-step solvothermal method by firstly preparing CdS nano rods by taking cadmium nitrate and thiourea as a cadmium source and a sulfur source respectively and adopting a solvothermal method, then performing a hydrothermal reaction by taking nickel nitrate hexahydrate, hexamethylenetetramine, trisodium citrate and the synthesized CdS nano rods as substrates and taking deionized water as a solvent, then cooling, then adding an NaHSe solution, and then continuing to raise the temperature for reacting. The heterojunction photocatalyst involved in the invention has high hydrogen production rate in visible light; a preparation method is environmentally friendly; the operation is simple; the activity is stable; the utilization rate of the photocatalyst to sunlight, especially the visible light, is greatly improved; higher economic benefit can be obtained.

Description

technical field [0001] The invention belongs to the field of photocatalyst preparation and application, in particular to a NiSe 2 A high-efficiency heterojunction photocatalyst constructed as an auxiliary agent, its preparation method and application. Background technique [0002] The energy issue is one of the important issues related to the national economy and people's livelihood in today's international society. Since Fujishima and Honda realized the pioneering discovery of photocatalytic water splitting to produce hydrogen in 1972, the way to obtain the cleanest energy source—hydrogen through solar-driven water splitting has immediately attracted the attention of scientists all over the world. CdS semiconductor has a suitable band gap (∼2.4 eV) and is considered as a promising photocatalyst for visible light-driven water splitting. However, due to the high recombination rate of photoexcited electrons and holes, pure CdS semiconductors usually show weak photocatalytic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/057B01J37/08C01B3/04
CPCB01J27/0573B01J37/08C01B3/042C01B2203/1058C01B2203/0277B01J35/39Y02E60/36
Inventor 黄彩进陈朝辉龚海生刘秋文
Owner FUZHOU UNIV
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