Photocatalyst as well as preparation method and application thereof

A photocatalyst, zinc chloride technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. The problems of photocatalytic efficiency and low utilization rate of visible light band have achieved broad application prospects, high practical value, and the effect of reducing catalyst costs.

Active Publication Date: 2022-06-07
XIAMEN INST OF RARE EARTH MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ZnO with a wurtzite structure has a large band gap, Eg is about 3.37eV, and can only absorb solar ultraviolet light, making the utilization of visible light bands that account for 40%-50% of solar energy low, and a single ZnO light The rapid recombination of photogenerated carriers in the catalyst seriously reduces the utilization of solar energy and photocatalytic efficiency

Method used

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  • Photocatalyst as well as preparation method and application thereof
  • Photocatalyst as well as preparation method and application thereof
  • Photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing a photocatalyst provided in the present embodiment, comprising the following steps:

[0029] S1: Prepare ZnO nanoparticles, weigh 4.59gZnAc 2Dissolve in 25 ml of methanol solution, continuously stir at 60 °C for 30 minutes to form a suspension, add 50 ml of potassium hydroxide solution (1M) to the suspension, continue stirring at 60 °C for 2 hours to form a white precipitate, cool to room temperature, filter, wash several times with ultrapure water, and then vacuum dry at 70 °C in a vacuum drying box until overnight to obtain ZnO nanoparticles.

[0030] S2: Prepare ZnIn 2 S 4 Nanosheets, using a one-step hydrothermal synthesis method, weigh 0.17 g of zinc chloride (ZnCl 2 ), 0.73 g indium trichloride (InCl) tetrahydrate 3 ·4H 2 O) and 0.38g thioacetamide (TAA) sonically dissolved into 25ml of ethylene glycol, continuously stirred at room temperature for 30 minutes, forming a mixture, the mix of the step was transferred to a 50ml polytetrafluoroethylen...

Embodiment 2

[0038] The difference between the present embodiment and Example 1 is:

[0039] S3: Prepare 2ZnIn 2 S 4 / ZnO heterojunction nanomaterials, using a one-step hydrothermal synthesis method, weighing 0.34 g of zinc chloride, 1.46 g of indium trichloride tetrahydrate and 0.76 g of thioacetyl dissolved into 25 ml of ethylene glycol, continuously stirred at room temperature for 30 minutes, to form a mixture, the ZnO nanoparticles prepared in step S1 (weighed 0.1 g) dispersed in the mixed liquid of this step, sonically dispersed for 30 minutes at room temperature, and then transferred to a 50 ml polytetrafluoroethylene lined autoclave, Heat at a temperature of 120 °C for 2 hours to obtain the pellet, and then centrifuge, wash, and separate the pellet of this step, and then dry it in vacuo for 12 hours to obtain 2ZnIn 2 S 4 / ZnO heterojunction nanomaterials as photocatalysts.

[0040] The present embodiment also provides a photocatalyst, the photocatalyst is prepared using a preparation me...

Embodiment 3

[0042] The difference between the present embodiment and Example 1 is:

[0043] S3: Prepare ZnIn 2 S 4 / 2ZnO heterojunction nanomaterials, using a one-step hydrothermal synthesis method, weighing 0.17g zinc chloride, 0.73g indium trichloride tetrahydrate and 0.38g thioacetyl dissolved into 25ml of ethylene glycol, continuously stirred at room temperature for 30 minutes, to form a mixture, the ZnO nanoparticles prepared in step S1 (weighed 0.2g) dispersed in the mixed liquid in this step, sonically dispersed for 30 minutes at room temperature, and then transferred to a 50ml polytetrafluoroethylene lined autoclave, Heat at a temperature of 120 °C for 2 h to obtain the pellet, and then centrifuge, wash, and separate the pellet of this step, and then dry it in vacuo for 12 h to obtain ZnIn 2 S 4 / 2ZnO heterojunction nanomaterials as photocatalysts.

[0044] The present embodiment also provides a photocatalyst, the photocatalyst is prepared using a preparation method such as the above-d...

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Abstract

The invention discloses a photocatalyst and a preparation method and application thereof, and belongs to the technical field of semiconductor photocatalytic decomposition of water to produce hydrogen, and the preparation method comprises the following steps: S1, preparing ZnO nanoparticles, S2, preparing ZnIn2S4 nanosheets, S3, preparing an AZnIn2S4/BZnO heterojunction nanomaterial, adopting a one-step hydrothermal synthesis method, weighing zinc chloride, indium trichloride tetrahydrate and thioacetyl, dissolving the zinc chloride, the indium trichloride tetrahydrate and the thioacetyl into ethylene glycol, adding a catalyst, and stirring to obtain the photocatalyst. The preparation method comprises the following steps: dispersing ZnO nanoparticles prepared in the step S1 into a mixed solution, carrying out ultrasonic treatment at room temperature for 25-40 minutes to form a mixed solution, dispersing the ZnO nanoparticles prepared in the step S1 into the mixed solution obtained in the step S1, carrying out ultrasonic treatment at room temperature for 25-40 minutes, then transferring into a high-pressure kettle with a polytetrafluoroethylene lining, heating at 100-130 DEG C for 1.5-3 hours to obtain a precipitate, and then centrifuging, washing and separating the precipitate obtained in the step S1 to obtain the ZnO nano-particles. The preparation method comprises the following steps: adding BZnO and AZnIn2S4 into a hydrothermal reaction kettle, carrying out vacuum drying for 10-14 hours to obtain an AZnIn2S4/BZnO heterojunction nano material which is used as a photocatalyst, and synthesizing a ZnIn2S4/ZnO heterojunction through a hydrothermal method to form the photocatalyst with high photocatalytic performance.

Description

Technical field [0001] The present invention belongs to the field of semiconductor photocatalytic decomposition of water to hydrogen technology, in particular to a photocatalyst and preparation method and application thereof. Background [0002] At present, environmental pollution and energy crisis have become two major problems that seriously threaten the survival of mankind and affect the sustainable development of mankind. Photocatalytic technology has become a potential option for environmental remediation and energy solutions. Among renewable energy sources, hydrogen energy provides potential opportunities for future new energy production to meet energy challenges with many advantages such as clean, sustainable, high combustion calorific value, and high energy density. Due to the abundance of solar and water resources on Earth, sunlight-catalyzed water decomposition to produce high-purity green hydrogen is considered an economically promising way to convert solar energy into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06B01J27/04B01J35/00C01B3/04
CPCB01J27/04B01J23/06B01J35/004C01B3/042Y02W10/37Y02E60/36
Inventor 陈儆卢灿忠谢紫娱卢帧灿卢健
Owner XIAMEN INST OF RARE EARTH MATERIALS
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