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AgIn5S8-ZnS quantum dot, preparation method and uses thereof

An agin5s8-zns, quantum dot technology, applied in chemical instruments and methods, inorganic chemistry, luminescent materials, etc., can solve problems such as poor photocatalytic stability, achieve good dispersion, excellent photocatalytic activity, and facilitate mass production.

Active Publication Date: 2018-04-10
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But AgIn 5 S 8 -The photocatalytic stability of ZnS quantum dots is poor and the low loading of quantum dot sensitizers in the existing synthesis method is also a problem that needs to be solved

Method used

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  • AgIn5S8-ZnS quantum dot, preparation method and uses thereof
  • AgIn5S8-ZnS quantum dot, preparation method and uses thereof
  • AgIn5S8-ZnS quantum dot, preparation method and uses thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Different ratios of L-cysteine ​​and MPA AgIn 5 S 8 -ZnS photocatalyst preparation

[0023] AgIn 5 S 8 -ZnS nanocrystals are prepared by weighing out silver nitrate, indium nitrate, zinc acetate dihydrate, and different amounts of L-cysteine, mixed and dissolved in the aqueous solution, adjusted to pH 8.5 with NaOH, and then added thioethyl Stir the amide ultrasonically for 10 minutes, then add a different amount of MPA relative to L-cysteine, stir again for 10 minutes, and then hydrothermally react at 110 degrees for 4 hours. After the reaction, the mixture is dried by centrifugation and the mixed ligand is made into AgIn. 5 S 8 -ZnS nanocrystalline. Control the ratio of L-cysteine ​​and MPA 0:10, 1:9, 2:8, 3:7, 5:5, 6:4, 8:2, 9:1, 10:0.

Embodiment 2

[0024] Example 2 AgIn 5 Characterization and Analysis of S8-ZnS Photocatalyst

[0025] figure 1 , It can be seen from the figure that although the amount of L-cysteine ​​and MPA changes, it is still mainly AgIn 5 S 8 -The peak of ZnS nanocrystal does not appear other impurity peaks.

[0026] figure 2 From the figure, it can be seen that as the amount of MPA increases, it corresponds to the visible light region, while the fluorescence pattern shows a trend of first increasing and then decreasing. This phenomenon may be caused by the increase of MPA. The size increases.

[0027] image 3 It can be seen from the figure that the percentage of elemental silver ions will decrease with the increase of MPA. It may be that MPA has replaced more atoms on the surface of quantum dots.

[0028] Figure 4 It can be seen from the figure that the quantum efficiency increases first and then decreases with the addition of MPA, and the quantum efficiency is the highest when the ratio is 5:5, indicating...

Embodiment 3

[0031] Example 3 AgIn 5 S 8 -ZnS photocatalyst for hydrogen production by visible light

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

[0033] (2) Weigh different proportions of AgIn 5 S 8 -ZnS catalyst sample 20mg, placed in the reaction flask.

[0034] (3) After that, weigh 0.4725g of sodium sulfite and 1ml of (1) in the reaction flask, and ultrasound for 5 minutes.

[0035] (4) Then put it on the nine channels for illumination, and take a sample every 1 hour for detection by gas chromatography. After data processing, you can get Figure 5 Diagram of hydrogen production. Under the condition of adding sacrificial agent, the optimized Cys / MPA=5:5 quantum dots visible light photocatalytic decomposition rate of water to produce hydrogen is 3.8 times that of pure l-cysteine ​​synthesized quantum dots. Description of AgIn encapsulated by mixed ligand 5 S 8 -ZnS quantum dots further improve the hydrogen production performance of the catalyst.

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Abstract

The invention relates to the technical field of photocatalytic hydrogen production, particularly to an AgIn5S8-ZnS quantum dot, a preparation method and uses thereof, wherein the AgIn5S8-ZnS quantum dot can be used for photocatalytic hydrogen production under visible light. The preparation method comprises: weighing silver nitrate, indium nitrate, zinc acetate and different amounts of L-cysteine,mixing and dissolving in an aqueous solution, adjusting the pH value of the solution to 8.5 with NaOH, adding thioacetamide, carrying out ultrasonic stirring, adding MPA corresponding to different amounts of L-cysteine, stirring, carrying out a hydrothermal reaction for 4 h at a temperature of 110 DEG C, and carrying out ethanol centrifugation washing drying after completing the reaction to obtainthe AgIn5S8-ZnS nanometer crystal. According to the present invention, the visible light-irradiated water decomposition hydrogen production experiment results prove that the prepared mixed ligand catalyst has good photocatalytic activity.

Description

Technical field [0001] The invention relates to the technical field of photocatalytic hydrogen production, and uses mixed ligands of L-cysteine ​​and trimercaptopropionic acid in different proportions to prepare AgIn 5 S 8 -ZnS quantum dots, and measure the photocatalytic hydrogen production performance of the quantum dots. Background technique [0002] With the development of the world economy, the world's energy consumption has been increasing year by year, further exacerbating the depletion of fossil fuels. Moreover, the use of fossil fuels also brings about all serious environmental problems, so it is imminent to discover new and clean energy sources that can replace fossil fuels. Hydrogen energy has always been considered a clean and pollution-free green energy source. In the past few decades, photocatalytic hydrogen production has been regarded as the most promising and most effective way to convert inexhaustible solar energy into hydrogen energy. And AgIn 5 S 8 -ZnS quan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C01B3/04C09K11/62
CPCC09K11/623C01B3/042B01J27/04C01B2203/1041B01J35/39Y02E60/36
Inventor 毛宝东杨亚林刘艳红谭丽丽张科伟余芙荣杨少霞夏正龙
Owner JIANGSU UNIV
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