Method of preparing quaternary sulfide quantum dot photocatalyst

A photocatalyst, quantum dot technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc.

Inactive Publication Date: 2017-10-27
YANCHENG INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, applied research has not yet investigated the effect of CuInZnS quantum dot component Cu on photocatalytic hydrogen production.

Method used

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  • Method of preparing quaternary sulfide quantum dot photocatalyst
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  • Method of preparing quaternary sulfide quantum dot photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1C

[0016] The preparation of embodiment 1CuInZnS quantum dot photocatalyst

[0017] Weigh copper acetate, 0.139 grams of zinc acetate, 0.4867 grams of indium nitrate, mix and dissolve in 4.125 milliliters of water, here in order to synthesize CuInZnS photocatalysts with different proportions of copper, add different amounts of copper acetate 0.0127g-0.0635g (CIZS- 0.05-CIZS-2.5), after uniform mixing, add 0.4537 g of L-cysteine ​​aqueous solution. Then use 1 mole per liter of sodium hydroxide to adjust the pH to 8.5, add 0.183 g of thioacetamide solution, mix evenly by ultrasonic, hydrothermally react in an oven at 110°C for 4 hours, and cool to room temperature. When washing and centrifuging, first add a small amount of water to dissolve it, then add ethanol to precipitate and centrifuge, and repeat this two to three times. Finally, the obtained CuInZnS quantum is dissolved in water and stored, which is convenient for the test and analysis of the structure and performance in th...

Embodiment 2

[0018] Characterization analysis of embodiment 2CuInZnS quantum dot photocatalyst

[0019] Such as figure 1 As shown, it can be seen from the figure that with the increase of copper content, the diffraction main peak type of CuInZnS quantum dot photocatalyst basically does not change, but the main peak slightly shifts to a larger wave number, which may be due to the further interaction between copper and quantum dots.

[0020] Such as figure 2 As shown, it can be seen from the figure that we have successfully prepared quantum dots with a size of 3-5 nanometers, and the lattice spacing of 0.31 nanometers corresponds to the (112) crystal plane of chalcopyrite CuInZnS quantum dots.

[0021] Such as image 3 As shown, it can be seen from the figure that as the copper content increases, the light absorption redshifts, that is, the increase in the copper content reduces the band gap of the quantum dots and increases the light absorption.

[0022] Such as Figure 4 As shown, it ...

Embodiment 3

[0023] Visible light catalytic activity experiment of embodiment 3CuInZnS quantum dot photocatalyst

[0024] (1) Weigh 100 mg of CuInZnS quantum dot photocatalyst and 2wt% chloroplatinic acid solution and place it in a photocatalytic hydrogen production reactor, add 100 ml of water and an appropriate amount of sacrificial agent to sonicate for 15 minutes.

[0025] (2) The amount of hydrogen gas generated was measured every hour by gas chromatography.

[0026] (3) by Figure 4 It can be seen that the prepared photocatalyst has high visible light catalytic activity, especially the CIZS-1 sample, which is about 11 times more active than CIZS-0.05 for hydrogen production.

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Abstract

The invention relates to alloying metal sulfide, in particular to a method of preparing a quaternary sulfide quantum dot photocatalyst. The method of preparing the I-III-VI CuInZnS quantum dot photocatalyst by taking copper acetate, zinc acetate, indium nitrate and thiacetamide as raw materials is simple in preparation technology; and the photocatalyst has good visible photocatalytic activity. A valence band of a quantum dot system consists of a 2p orbit of sulfur and a 3d orbit of copper, a band gap of a substance, namely light absorption capacity is influenced by regulating and controlling the copper quantity, and a copper defect effect is weakened by a catalyst promoter Pt, so that separation and transfer of a photoexcitation electron hole of nanocrystalline are greatly improved, and the activity of produced hydrogen is optimized.

Description

technical field [0001] The invention relates to alloyed metal sulfides, in particular to a method for preparing I-III-VI group CuInZnS quantum dot photocatalysts with copper acetate, zinc acetate, indium nitrate and thioacetamide as raw materials. The preparation process is simple, The product is a photocatalyst with good visible light catalytic activity. Background technique [0002] At present, photo-splitting water hydrogen production technology can realize a large amount of solar energy to chemical energy conversion, which is a good way of energy conversion, and the prepared hydrogen energy is a sustainable high-combustion value clean energy, which can simultaneously solve the increasingly more serious environmental problems and energy crisis. The key to the high activity of photocatalytic water splitting is the energy band structure of the catalyst, the ability to absorb light, and the separation and transfer of photogenerated charges. Therefore, the study of photocat...

Claims

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Application Information

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