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A kind of surface cadmium-rich cdse quantum dot photocatalyst and its preparation method and application

A photocatalyst and quantum dot technology, applied in the field of nanomaterials, can solve the problems of low catalytic activity and poor stability, and achieve the effects of promoting electron conduction, solving low efficiency, excellent activity and stability

Active Publication Date: 2020-05-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention solves the technical problem that the catalyst for catalyzing carbon dioxide reduction in the prior art needs to work together with the co-catalyst, and the catalytic activity is not high and the stability is not good

Method used

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  • A kind of surface cadmium-rich cdse quantum dot photocatalyst and its preparation method and application
  • A kind of surface cadmium-rich cdse quantum dot photocatalyst and its preparation method and application
  • A kind of surface cadmium-rich cdse quantum dot photocatalyst and its preparation method and application

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Experimental program
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Effect test

Embodiment 1-4

[0033] Embodiment 1-4: CdSe quantum dot with high catalytic activity and its preparation method. The schematic flow chart of the preparation method is as figure 1 As shown, after adjusting the pH of the CdSe quantum dot solution modified with ligands on the surface, the ligands modified on the surface of the CdSe quantum dots react with hydrogen ions, so that at least part of the ligands are stripped from the surface of the CdSe quantum dots. After stripping the surface ligands by acid make the surface Cd 2+ Barely obtained CdSe quantum dots with high catalytic activity. The surface cadmium and selenium contents corresponding to the prepared CdSe quantum dots were obtained by X-ray photoelectron spectroscopy (XPS), as shown in Table 1.

[0034] Table 1

[0035]

Embodiment 1

[0037] CdCl 2 2.5H 2 O (46.0 mg, 0.2 mmol) was dissolved in deionized water (190.0 mL), stirred, 3-mercaptopropionic acid (MPA, 26.0 μL, 0.3 mmol) was added, and 1.0 mol / L NaOH solution was added dropwise to the solution to adjust the pH to 11. Charge N 2 Add 5.0mmol / L Na after protection 2 SeSO 3 The solution (20 mL, 0.1 mmol) was heated to 120° C. for 4 hours. After cooling, the solution was concentrated to 40.0 mL, and 36% concentrated hydrochloric acid was added thereto to adjust the pH to 3. Solids were precipitated, centrifuged, washed, and dried to obtain a yellow solid. The obtained solid is tested by TEM, showing that its particle size is about 2nm, such as figure 2 shown.

Embodiment 2

[0039] CdCl 2 2.5H 2 O (46.0 mg, 0.2 mmol) was dissolved in deionized water (190.0 mL), stirred, 3-mercaptopropionic acid (MPA, 26.0 μL, 0.3 mmol) was added, and 1.0 mol / L NaOH solution was added dropwise to the solution to adjust the pH to 10, charge N 2 Add 5.0mmol / L Na after protection 2 SeSO 3 solution (10.0 mL, 0.05 mmol), heated to 130° C. for 3 hours. After cooling, the solution was concentrated to 40.0 mL, and 37% concentrated hydrochloric acid was added thereto to adjust the pH to 3. Solids were precipitated, centrifuged, washed, and dried to obtain a yellow solid. The X-ray diffraction (XRD) pattern of the prepared quantum dots is shown as image 3 As shown, corresponding to (111), (220), (311) crystal planes respectively.

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Abstract

The invention discloses a surface cadmium-rich CdSe quantum dot photocatalyst and a preparation method and application thereof and belongs to the field of nano materials. The preparation method includes: using water-soluble organic carboxylic acid containing sulfhydryl as the stabilizer, and regulating the feed ratio of cadmium salt and selenosulfate in water phase to prepare CdSe quantum dots with ligand modification and different surface Cd / Se proportions, wherein the mass ratio of cadmium ions to selenosulfate is (2-10):1, the water-soluble organic carboxylic acid is preferably mercaptopropionic acid or mercaptoacetic acid, the cadmium salt is preferably cadmium chloride, cadmium sulfate or cadmium nitrate, and the selenosulfate is preferably selenosodium sulfate or selenopotassium sulfate; using acid stripping to allow at least part of ligands to fall off, and exposing Cd<2+> to obtain the high-catalytic-activity surface cadmium-rich CdSe quantum dot photocatalyst with the diameterbeing 1-5nm. The photocatalyst is simple in synthesizing method and excellent in photocatalytic carbon dioxide reducing effect under visible light condition.

Description

technical field [0001] The invention belongs to the field of nanometer materials, in particular to a surface cadmium-rich CdSe quantum dot photocatalyst and its preparation method and application. Background technique [0002] With the development of human society, energy consumption is also increasing day by day, of which more than 80% comes from fossil fuels represented by coal, oil and natural gas. Excessive reliance on fossil fuels contributes to CO in the air 2 The increase in the concentration of greenhouse gases will lead to the destruction of the balance of surface heat radiation, which will have a great adverse effect on the entire living environment. Therefore, effective use of cheap and abundant CO 2 Carbon resources are of great significance to environmental protection and new energy development. [0003] CO 2 Chemically stable (ΔG θ =-400kJ mol -1 ) for linear molecules to achieve CO without catalyst and energy input 2 It is almost impossible to convert d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/26C01B32/40
CPCB01J31/26B01J35/004C01B32/40
Inventor 王锋夏雾吴进胡俊超
Owner HUAZHONG UNIV OF SCI & TECH
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