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A high-efficiency heterojunction photocatalyst using nise as an auxiliary agent and its preparation method and application

A photocatalyst and heterojunction technology, applied in chemical instruments and methods, physical/chemical process catalysts, hydrogen production, etc., can solve problems such as high cost, achieve rich applications, simple preparation process, and promote hydrogen production activity Effect

Inactive Publication Date: 2021-07-27
FUZHOU UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to construct the NiSe / Cd of NiSe co-catalyst modification 0.5 Zn 0.5 S heterojunction photocatalyst and explore its activity in the photocatalytic water splitting hydrogen production reaction to address Cd 0.5 Zn 0.5 The high cost problem caused by the easy recombination of charge carriers and noble metal modification of S in photocatalytic water splitting for hydrogen production

Method used

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  • A high-efficiency heterojunction photocatalyst using nise as an auxiliary agent and its preparation method and application
  • A high-efficiency heterojunction photocatalyst using nise as an auxiliary agent and its preparation method and application
  • A high-efficiency heterojunction photocatalyst using nise as an auxiliary agent and its preparation method and application

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preparation example Construction

[0016] The preparation steps of the present invention are as follows:

[0017] Cd 0.5 Zn 0.5 Preparation of S solid solution: Weigh 10 mmol of cadmium acetate·dihydrate and 10 mmol of zinc acetate·dihydrate into a 100 mL reaction kettle liner, add 40 mL of deionized water and stir to dissolve, and then magnetically Under stirring, 10 mL of 4 mol / L NaOH aqueous solution was added dropwise to the above solution with a pipette, and the solution gradually turned into a white viscous paste. After stirring for 30 minutes, 25 mmol of thioacetamide was added to the solution with stirring. the above solution. The reaction mixture gradually turned yellow, after which it was stirred again for 30 minutes, then it was sealed in an autoclave, heated to 180°C in an electric blast drying oven, and held for 24 hours. After cooling 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 hours to obtain Cd 0....

Embodiment 1

[0020] A certain amount of nickel sulfate hexahydrate and sodium selenite (14.53 μmoL) were dissolved in 40 mL of ethylene glycol solvent in a molar ratio of 1:1, and then a certain amount of Cd was added. 0.5 Zn 0.5 S solid solution (40 mg) was stirred uniformly and then transferred to the autoclave, kept at 180 °C for 24 hours, and finally cooled to room temperature naturally. The obtained samples were centrifuged and washed with deionized water and absolute ethanol, and dried in a vacuum oven to obtain NiSe / Cd with a NiSe loading of 0.5%. 0.5 Zn 0.5S heterojunction photocatalyst. Accurately weighed 10 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

[0022] Dissolve a certain amount of nickel sulfate hexahydrate and sodium selenite (29.06 μmoL) in 40 mL of ethylene glycol solvent at a molar ratio of 1:1, and then add a certain amount of Cd 0.5 Zn 0.5 S solid solution (40 mg), stirred evenly, transferred to a high-pressure reactor, kept at 180°C for 24 hours, and finally cooled down to room temperature naturally. The obtained samples were washed by centrifugation with deionized water and absolute ethanol, and dried in a vacuum oven to obtain NiSe / Cd with a NiSe loading of 1%. 0.5 Zn 0.5 S heterojunction photocatalyst. Accurately weighed 10 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 discloses a NiSe-based heterojunction photocatalyst driven by visible light for high-efficiency photocatalytic water splitting and hydrogen production. First, cadmium acetate, zinc acetate and thioacetamide are used as cadmium, zinc and sulfur sources respectively, and precipitation-water is used to Cd was prepared thermally 0.5 Zn 0.5 S solid solution, followed by nickel sulfate hexahydrate, sodium selenite and synthesized Cd 0.5 Zn 0.5 NiSe / Cd was synthesized by a one-step solvothermal method with S solid solution as substrate and ethylene glycol as solvent and reducing agent. 0.5 Zn 0.5 S heterojunction photocatalyst; the maximum hydrogen production rate of the heterojunction photocatalyst of the present invention reaches 70.3 mmol / h / g under visible light, which is pure Cd 0.5 Zn 0.5 The activity of the S solid solution is 2.35 times, and the preparation method is green and environmentally friendly, the operation is simple, and the activity is stable, which greatly improves the utilization rate of the photocatalyst for sunlight, especially visible light, and can obtain higher economic benefits.

Description

technical field [0001] The invention belongs to the field of photocatalyst preparation and application, in particular to a high-efficiency heterojunction photocatalyst constructed with NiSe as an auxiliary agent, and a preparation method and application thereof. 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 the pioneering discovery of photoelectric catalytic water splitting to produce hydrogen by Fujishima and Honda in 1972, the way to obtain hydrogen, the cleanest energy source through solar-driven water splitting, has immediately attracted the attention of scientists around the world. CdS semiconductors with a suitable band gap (∼2.4 eV) are considered as promising photocatalysts for visible-light driven water splitting. However, pure CdS semiconductors usually show weak photocatalytic hydrogen production activity due to the high recombination ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/057C01B3/04
CPCB01J27/0573B01J35/0013B01J35/004B01J35/006B01J35/0093C01B3/042Y02E60/36
Inventor 黄彩进龚海生刘秋文
Owner FUZHOU UNIV
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