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Cadmium sulphide selenide solid solution quantum dot and preparation method and photocatalytic hydrogen production application thereof

A technology of quantum dots and solid solution, applied in the field of photocatalytic materials, can solve the problems of complex process and difficult to obtain products, and achieve the effects of simple process, improved solar energy utilization rate, and huge specific surface area.

Active Publication Date: 2016-08-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the general process for preparing catalysts corresponding to visible light is relatively complicated, and the products are not easy to obtain.

Method used

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  • Cadmium sulphide selenide solid solution quantum dot and preparation method and photocatalytic hydrogen production application thereof
  • Cadmium sulphide selenide solid solution quantum dot and preparation method and photocatalytic hydrogen production application thereof
  • Cadmium sulphide selenide solid solution quantum dot and preparation method and photocatalytic hydrogen production application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of CdSeS solid solution quantum dots:

[0038] (1) CdSe precursor Na 2 SeSO 3 Preparation: Sodium sulfite and selenium powder were added to deionized water at a mass ratio of 3:1 and refluxed at 90°C for 10 hours to obtain Na with a concentration of 0.2mol / L. 2 SeSO 3 The solution is ready for use;

[0039] (2) Preparation of water-soluble CdSe quantum dots: 0.272g (CH 3 COO) 2 Cd·2H 2 O was dissolved in 180mL distilled water and stirred until the resulting solution had a concentration of 5mg / L, then 0.4mol / L NaOH solution was added dropwise until the pH of the solution was 11, and then reacted with high-purity nitrogen for 30 minutes, and then 240μL thioglycolic acid and 3mL were added respectively Na at a concentration of 0.2mol / L 2 SeSO 3Solution, reacted at room temperature for 1 hour, then heated to 60°C and stirred for 1 hour to obtain a water-soluble CdSe quantum dot suspension (concentration: 780mg / L), and added 30mL of acetone to the 20mL wa...

Embodiment 2

[0053] Preparation of CdSeS quantum dots:

[0054] (1) CdSe precursor Na 2 SeSO 3 Preparation: Sodium sulfite and selenium powder were added to deionized water at a mass ratio of 3:1 and refluxed at 70°C for 5 hours to obtain Na with a concentration of 0.1mol / L. 2 SeSO 3 solution;

[0055] (2) Preparation of water-soluble CdSe quantum dots: 0.09g (CH 3 COO) 2 Cd·2H 2 O was dissolved in 180 mL of distilled water and stirred to obtain a solution concentration of 0.5 mg / L. Then add 0.4mol / L NaOH solution dropwise until the pH of the solution is 11, then pass high-purity nitrogen to react for 30 minutes, then add 240μL thioglycolic acid and 3mL NaOH with a concentration of 0.1mol / L 2 SeSO 3 Solution, reacted at room temperature for 1 hour, then heated to 40°C and stirred for 40 minutes to obtain a water-soluble CdSe quantum dot suspension (concentration is 500mg / L), and added 30mL of acetone to the 20mL water-soluble CdSe quantum dot suspension that was taken out, and allo...

Embodiment 3

[0058] Preparation of CdSeS quantum dots: in a beaker containing 80mL of distilled water, add 10mL of the water-soluble CdSe quantum dot suspension prepared in Example 1 and 5.24g Na 2 S with 2.5g NaSO 3 , the reactants in the beaker were ultrasonically decomposed, mixed evenly and stirred at room temperature for 40 minutes, and dried by centrifugation to obtain CdSeS solid solution quantum dots.

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Abstract

The invention relates to a CdSeS solid solution quantum dot and a preparation method and photocatalytic hydrogen production application thereof. The preparation method of the cadmium sulphide selenide solid solution quantum dot includes the steps that 1, a Na2SeSO3 solution is prepared, wherein selenium powder flows back in a water solution of sodium sulfite, and the Na2SeSO3 solution is obtained; 2, CdSe quantum dot suspension liquid is prepared, wherein (CH3COO)2Cd.2H2O is dissolved in distilled water, the pH value of the solution is adjusted to be 11 with alkali liquid, nitrogen is introduced for 30 min, mercaptoacetic acid and the Na2SeSO3 solution are added in the nitrogen atmosphere, a reaction is conducted for 1 h at normal temperature, the reaction is conducted for 40-60 min at the temperature of 40-60 DEG C, and the water-soluble CdSe quantum dot suspension liquid is obtained; 3, the water-soluble CdSe quantum dot suspension liquid, Na2S and Na2SO3 are added into distilled water, the obtained mixture is ultrasonically dispersed and continues to be subjected to a stirring reaction, and the CdSeS solid solution quantum dot is obtained.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a CdSeS solid solution quantum dot, a preparation method thereof and an application of photocatalytic decomposition of distilled water to produce hydrogen. Background technique [0002] As a clean energy, hydrogen has the advantages of high combustion value and zero pollution emission. At the same time, it is also a commonly used industrial raw material, widely used in synthetic ammonia, petroleum hydrocracking, and metallurgical industries. At present, using non-renewable fossil resources as raw materials is the main way to produce hydrogen. The use of fossil energy has brought about an increasingly serious energy crisis and environmental problems. Therefore, the development of renewable energy hydrogen production technology is the fundamental way to solve energy and environmental problems. [0003] Photocatalytic water splitting for hydrogen produ...

Claims

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Application Information

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IPC IPC(8): C09K11/88B01J27/057C01B3/04C01B19/00B82Y30/00
CPCC09K11/883B82Y30/00C01B3/042C01B19/002B01J27/0573C01P2004/04C01P2002/82C01P2002/85C01P2002/72C01P2004/64B01J35/39Y02E60/36
Inventor 余家国牟善伟
Owner WUHAN UNIV OF TECH
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