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Supported photocatalyst nise 2 The preparation method of /cds and its application

A photocatalyst, supported technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high cost and easy recombination of charge carriers, achieve rich applications and speed up separation and transfer and promote the effect of hydrogen production activity

Active Publication Date: 2021-08-31
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • 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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  • Supported photocatalyst nise <sub>2</sub> The preparation method of /cds and its application
  • Supported photocatalyst nise <sub>2</sub> The preparation method of /cds and its application
  • Supported photocatalyst nise <sub>2</sub> The preparation method of /cds and its application

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preparation example Construction

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

[0018] Preparation of CdS nanoparticles: Weigh 12.5 mmol of cadmium nitrate tetrahydrate and 37.5 mmol of thiourea into a 100 mL reaction kettle lining, add 60 ml of ethylenediamine and stir to dissolve, then seal it in a high-pressure reaction The kettle was 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...

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 3wt% 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 5wt% 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 photocatalyst preparation and application, and relates to a visible light-driven high-efficiency photocatalytic water splitting hydrogen production NiSe 2 Based heterojunction photocatalyst, firstly, CdS nanorods were prepared by solvothermal method using cadmium nitrate and thiourea as cadmium source and sulfur source respectively, and then nickel nitrate hexahydrate, hexamethylenetetramine and trisodium citrate With the synthesized CdS nanorods as the substrate and deionized water as the solvent, after the hydrothermal reaction cooled down, NaHSe solution was added and the temperature was continued to react, and NiSe was synthesized by a two-step solvothermal method. 2 / CdS heterojunction photocatalyst; the heterojunction photocatalyst of the present invention has a high hydrogen production rate under visible light, and the preparation method is green and environmentally friendly, with simple operation and stable activity, which greatly improves the utilization of sunlight, especially visible light, by the photocatalyst rate, can obtain higher economic benefits.

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 Patents(China)
IPC IPC(8): B01J27/057B01J37/08C01B3/04
CPCB01J27/0573B01J35/004B01J37/08C01B3/042C01B2203/0277C01B2203/1058Y02E60/36
Inventor 黄彩进陈朝辉龚海生刘秋文
Owner FUZHOU UNIV
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