A method for preparing molybdenum oxide-modified quaternary sulfide quantum dot photocatalysts

A technology of photocatalysts and quantum dots, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve good dispersion effect

Active Publication Date: 2020-08-11
YANCHENG INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no research on the hydrogen production light application of molybdenum oxide modified CuInZnS quantum dots.

Method used

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  • A method for preparing molybdenum oxide-modified quaternary sulfide quantum dot photocatalysts
  • A method for preparing molybdenum oxide-modified quaternary sulfide quantum dot photocatalysts
  • A method for preparing molybdenum oxide-modified quaternary sulfide quantum dot photocatalysts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The preparation of the CuInZnS quantum dot photocatalyst modified by the molybdenum oxide group of embodiment 1

[0018] Take by weighing 0.1357 gram of copper acetate, 0.186 gram of zinc acetate, 0.649 gram of indium nitrate, and a certain amount of sodium molybdate is mixed and dissolved in 4 milliliters of water. Here, in order to synthesize samples containing molybdate radicals in different proportions, the addition of indium nitrate is fixed and adjusted. Add the amount of sodium molybdate (the molar ratio of sodium molybdate / indium acetate is 0.05 / 1-0.15 / 1). Add 0.244 g of thioacetamide solution, mix evenly by ultrasonic, react at 110°C for 4 hours, cool to room temperature, and centrifuge for the first sample and ethanol volume ratio of 1 / 1, and then dissolve the centrifuged sample with a small amount of water Add ethanol to precipitate and centrifuge for the second time, and the third washing and centrifugation is similar to the second time, first dissolve in wa...

Embodiment 2

[0019] Characterization analysis of the CuInZnS quantum dot photocatalyst modified by the molybdenum oxide group of embodiment 2

[0020] Such as figure 1 As shown, it can be seen from the figure that with the increase of the molybdenum oxide content, the diffraction main peak of the molybdenum oxide modified CuInZnS quantum dot photocatalyst has no obvious change.

[0021] Such as figure 2 As shown, it can be seen from the figure that with the increase of molybdenum oxide content, the peak of Mo-O bond appears and strengthens, indicating that molybdenum oxide has successfully modified CuInZnS quantum dots.

[0022] Such as image 3 As shown, it can be seen from the figure that with the increase of the molybdenum oxide content, the light absorption is red-shifted, that is, the increase of the molybdate group makes the band gap of the quantum dots decrease and the light absorption increases.

[0023] Such as Figure 4 As shown, it can be seen from the figure that with the ...

Embodiment 3

[0024] Example 3 Visible light catalytic activity experiment of molybdenum oxide modified CuInZnS quantum dot photocatalyst

[0025] (1) Weigh 20 mg of molybdenum oxide-modified CuInZnS quantum dot photocatalyst, place it in a photocatalytic hydrogen production reactor, add 15 ml of water and an appropriate amount of sacrificial agent and sonicate for 20 minutes.

[0026] (2) The amount of hydrogen gas generated was measured every hour by gas chromatography.

[0027] (3) by Figure 4 It can be seen that the prepared photocatalyst has excellent visible light catalytic activity, especially the Mo-0.1 sample has much higher hydrogen production performance than Mo-0.

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Abstract

The invention relates to I-III-VI2 group metal sulfide, in particular to a method for preparing molybdyl modified CuInZnS quantum dot photocatalyst from copper acetate, zinc acetate, indium nitrate, L-cysteine, thioacetamide and sodium molybdate. The invention relates to molybdyl modified I-III-VI2 group quaternary CuInZnS nano-crystal. The CuInZnS nano-crystal is a direct narrow bandgap and visible light responded quaternary semiconductor, the bandgap is continuous and adjustable, the quantum dot material has large specific surface area, more active sites are provided, the quantization advantage enables the semiconductor to obtain high charge migration rate, and the photocatalytic property is improved and enhanced; the molybdyl is electrostatically bonded with the sulfur vacancy on the surface of the nano-crystal and is modified on the CuInZnS nano-crystal, so the light absorbility of the nano-crystal is greatly improved, and the hydrogen producing activity is optimized.

Description

technical field [0001] The present invention relates to Group I-III-VI metal sulfides, in particular to a molybdenum oxide modified compound prepared from copper acetate, zinc acetate, indium nitrate, L-cysteine, thioacetamide and sodium molybdate. The CuInZnS quantum dot photocatalyst method, especially a kind of photocatalyst preparation method with simple preparation process and good visible light catalytic activity. Background technique [0002] At present, the world's environmental problems and energy crisis are becoming more and more serious. Excessive burning of fossil energy makes the global environment worse. This forces us to explore a new green energy to replace fossil fuels and solve environmental problems and energy crises at the same time. Hydrogen energy is a sustainable high-combustion value clean energy, and photo-splitting water hydrogen production technology can realize a large amount of solar energy to chemical energy conversion, which is a good way of en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/051C01B3/04B82Y40/00
CPCB01J27/051B01J35/004B82Y40/00C01B3/042Y02E60/36
Inventor 邵荣谭丽丽毛宝东宫关王勃
Owner YANCHENG INST OF TECH
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