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Efficient heterojunction photocatalyst taking NiSe as aid as well as preparation method and application thereof

A photocatalyst and heterojunction technology, applied in chemical instruments and methods, physical/chemical process catalysts, inorganic chemistry, etc., can solve problems such as high cost, and achieve the effect of simple preparation process and mild conditions

Inactive Publication Date: 2019-08-02
FUZHOU UNIV
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  • Abstract
  • 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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  • Efficient heterojunction photocatalyst taking NiSe as aid as well as preparation method and application thereof
  • Efficient heterojunction photocatalyst taking NiSe as aid as well as preparation method and application thereof
  • Efficient heterojunction photocatalyst taking NiSe as aid as well as preparation method and application thereof

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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 reactor lining, add 40 ml of deionized water and stir to dissolve, and then magnetically With stirring, 10 mL of 4 mol / L NaOH aqueous solution was added dropwise to the above solution with a straw, and the solution gradually turned into a white viscous paste. After stirring for 30 minutes, 25 mmol of thioacetamide was added to the above solution. The reaction mixture gradually turned yellow, and then stirred again for 30 minutes, and then it was sealed in a high-pressure reactor, heated to 180° C. in an electric blast drying oven, and kept for 24 hours. 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 hours to obtain Cd 0.5 Zn 0.5 S solid solution...

Embodiment 1

[0020] Dissolve a certain amount of nickel sulfate hexahydrate and sodium selenite (14.53 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 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 visible light driven NiSe-based heterojunction photocatalyst for performing efficient photocatalysis on water to perform pyrolysis to produce hydrogen. The heterojunction photocatalyst is prepared by the following steps: preparing Cd0.5Zn0.5S sosoloid by taking cadmium acetate, zinc acetate and thioacetamide as cadmium, zinc and sulfur sources correspondingly and adoptinga precipitation-hydrothermal method; and taking nickel sulfate hexahydrate, sodium selenite and the synthesized Cd0.5Zn0.5S sosoloid as substrates, taking glycol as a solvent and a reducing agent, and synthesizing a NiSe / Cd0.5Zn0.5S heterojunction photocatalyst through a one-step solvent-thermal method. The maximum hydrogen production rate of the heterojunction photocatalyst under visible light reaches 70.3 mmol / h / g, and the activity of the heterojunction photocatalyst is 2.35 times that of pure Cd0.5Zn0.5S sosoloid; furthermore, the preparation method is green, environmentally-friendly, simple to operate and stable in activity, the utilization rate of sunlight, particularly visible light by the photocatalyst is greatly increased, and higher economic benefit can be achieved.

Description

technical field [0001] The invention belongs to the field of photocatalyst preparation and application, and in particular relates 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 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 sho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/057C01B3/04
CPCB01J27/0573C01B3/042B01J35/399B01J35/393B01J35/39B01J35/23Y02E60/36
Inventor 黄彩进龚海生刘秋文
Owner FUZHOU UNIV
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