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0D/2D composite photocatalysis material and preparation method and application thereof

A technology of composite photocatalysis and ammonium molybdate tetrahydrate, which is applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as lack of hydrogen production activity, and achieve excellent photocatalytic activity and cost. Inexpensive and easy to mass-produce

Inactive Publication Date: 2019-08-16
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a lack of research on 0D Cu-In-Zn-S quantum dots and 2D MoS 2 Interfacial Interaction Affects Cu-In-Zn-S Quantum Dots / MoS 2 Study on Hydrogen Production Activity of Photocatalyst

Method used

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  • 0D/2D composite photocatalysis material and preparation method and application thereof
  • 0D/2D composite photocatalysis material and preparation method and application thereof
  • 0D/2D composite photocatalysis material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 12

[0021] Example 1 2D MoS 2 Preparation of Modified Cu-In-Zn-S Quantum Dot Composite Photocatalyst

[0022] Cu-In-Zn-S quantum dots are prepared by weighing copper acetate (0.0508g), zinc acetate (0.278g) and indium nitrate (0.9734g) and dissolving them in 8.25mL deionized water, and obtaining a colorless aqueous solution by ultrasonic . After adding 3mL of L-cysteine ​​(0.9074g) solution as a protective agent, 1mol L -1 Sodium hydroxide was used to adjust the pH of the mixed solution to be 8.5, and then 9.75 mL of 0.366 g of thioacetamide was added to the mixed solution. The mixed solution was ultrasonically mixed, transferred to a stainless steel autoclave (polytetrafluoroethylene lined), placed in an oven at 110°C, and kept for 4 hours. The obtained quantum dots were washed three times with deionized water / ethanol precipitation / centrifugation cycles, and stored in deionized water.

[0023] Cu-In-Zn-S / MoS 2 The preparation method of the photocatalyst is: weigh a certain a...

Embodiment 2

[0024] Example 2 Cu-In-Zn-S / MoS 2 Characterization analysis of photocatalyst

[0025] figure 1 , it can be seen from the figure that although with the MoS 2 The change of the amount is still mainly the peak of Cu-In-Zn-S nanocrystals and no other miscellaneous peaks can be observed. MoS 2 The introduction of did not cause changes in the position and intensity of diffraction peaks, and there was no obvious MoS 2 peaks and other impurity peaks, probably due to MoS 2 Low content or weak diffraction peaks do not significantly affect the crystal structure of Cu-In-Zn-S quantum dots.

[0026] figure 2 , it can be seen from the figure that with the MoS 2 An increase in the amount will lead to a red shift in the quantum dot absorption band edge and PL, indicating that MoS 2 After modification, the effective absorption of light by quantum dots is greatly improved, and the treated materials show higher fluorescence intensity.

[0027] image 3 , it can be seen from the figure th...

Embodiment 3

[0031] Example 3 Cu-In-Zn-S / MoS 2 Visible light catalytic hydrogen production experiment of photocatalyst

[0032] (1) Configure 5M sodium sulfide solution.

[0033] (2) Weigh different proportions of Cu-In-Zn-S / MoS 2 20 mg of the catalyst sample was placed in the reaction flask.

[0034] (3) Then weigh 0.4725g of sodium sulfite and 1ml of sodium sulfide solution into the reaction flask, and ultrasonicate for 5min.

[0035] (4) Afterwards, it is placed on the nine-channel for illumination, and a sample is taken every 1 hour for detection by gas chromatography. After data processing, we can get Image 6 hydrogen production map. Under the condition of adding sacrificial agent, the optimized MoS 2 / Cu-In-Zn-S=0.12 quantum dot visible light photocatalytic water splitting hydrogen production rate is 7.8 times higher than pure Cu-In-Zn-S quantum dot. Explain MoS 2 The modified Cu-In-Zn-S quantum dots further improved the hydrogen production performance of the catalyst.

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Abstract

The invention relates to the technical field of photocatalytic hydrogen generation, specifically to a 0D / 2D composite photocatalysis material and a preparation method and application thereof. The preparation method comprises the following steps: weighing a certain amount of ammonium molybdate and thioacetamide and dissolving the raw materials in deionized water to obtain a mixed solution, pouringthe mixed solution into a certain amount of a newly prepared Cu-In-Zn-S quantum dot solution, followed by uniform ultrasonic mixing; pouring the above solution into a high pressure reactor, placing the high pressure reactor into a drying oven of 180 DEG C, reacting for 16 h, and cooling to room temperature; and finally carrying out deionized water / ethanol ethanol precipitation / centrifugation circulatory washing on a compound for three times, drying the washed sample in a drying oven of 60 DEG C to obtain Cu-In-Zn-S / MoS2 nanocrystal. The experiment of visible light photocatalytic water splitting for hydrogen production proves that the prepared composite photocatalyst has a good photocatalytic activity.

Description

technical field [0001] The invention relates to the technical field of photocatalytic hydrogen production, in particular to a kind of 0D / 2D composite photocatalytic material and its preparation method and application. 2 The amount of addition of Cu-In-Zn-S / MoS prepared 2 Quantum dots, and measure the photocatalytic hydrogen production performance of the quantum dots. Background technique [0002] The energy crisis and environmental problems are imminent. The use of photocatalytic water splitting technology to produce hydrogen can rationally convert renewable sunlight into high-energy-density energy-hydrogen, and achieve energy cleanliness and environmental friendliness. In order to promote the large-scale application of photocatalytic water splitting technology for hydrogen production, the main challenge is to develop efficient and stable visible light catalysts. In recent years. Multinary sulfide quantum dots are favored in the field of photocatalysis due to their unique...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051B01J37/10B01J35/10B82Y20/00B82Y30/00B82Y40/00C01B3/04
CPCB01J27/051B01J37/10B82Y20/00B82Y30/00B82Y40/00C01B3/042C01B2203/1076C01B2203/0277B01J35/61B01J35/39Y02E60/36
Inventor 曹伟静毛宝东谭丽丽李丰华张栋琪董维璇
Owner JIANGSU UNIV
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