CdS/metallic organic frame composite photocatalysis material as well as preparation method and application thereof

A metal-organic framework, composite photocatalysis technology, applied in organic compound/hydride/coordination complex catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. , CdS instability, weak adsorption capacity and other problems, to achieve the effect of improving photoelectric stability, improving photostability, and photocurrent stability

Inactive Publication Date: 2019-02-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, CdS is unstable under light, and it is prone to self-oxidation to form sulfur element, which is the so-called photocorrosion phenomenon.
In addition, the specific surface area of ​​pure CdS is small, and the CO 2 The adsorption capacity of CdS is weak, and the conversion efficiency is low due to the high dynamic resistance of the gas-solid two-phase interface during the catalytic reaction process. At the same time, CdS catalyzes CO 2 Reduction to CO is less selective

Method used

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  • CdS/metallic organic frame composite photocatalysis material as well as preparation method and application thereof
  • CdS/metallic organic frame composite photocatalysis material as well as preparation method and application thereof
  • CdS/metallic organic frame composite photocatalysis material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Preparation of CdS / ZIF-8 and Its Photocatalytic Reduction of CO 2 Performance Testing

[0050] Step (1): Preparation of CdS nanomaterials

[0051] 7mmol thiourea, 7mmol Cd(NO 3 ) 2 4H 2 O and 7mmol PVP were dissolved in 70ml ethylene glycol to obtain a clear solution, then, the mixed solution was transferred to a 100ml tetrafluoroethylene-lined stainless steel autoclave, and kept at 120°C for 12h. After cooling the autoclave to room temperature, a certain amount of methanol was added to the resulting solution to make the CdS nanoparticles easier to precipitate. The solution is centrifuged, the precipitate is collected, washed and freeze-dried to obtain the CdS nanoparticles.

[0052] Step (2): Preparation of CdS / ZIF-8 composite material

[0053] First, 32 mg of CdS nanoparticles were dispersed in 10 ml of methanol and homogenized by ultrasonication, and then 0.2974 g of Zn(NO 3 ) 2 ·6H 2 O was dissolved in 50ml of methanol, the two were mixed while stirring and...

Embodiment 2

[0057] Preparation of CdS / ZIF-67 and Its Photocatalytic Reduction of CO 2 Performance Testing

[0058] Step (1): Preparation of CdS nanomaterials

[0059] 7mmol thiourea, 7mmol Cd(NO 3 ) 2 4H 2 O and 7mmol PVP were dissolved in 70ml ethylene glycol to obtain a clear solution, then, the mixed solution was transferred to a 100ml tetrafluoroethylene-lined stainless steel autoclave, and kept at 120°C for 12h. After cooling the autoclave to room temperature, a certain amount of methanol was added to the resulting solution to make the CdS nanoparticles easier to precipitate. The solution is centrifuged, the precipitate is collected, washed and freeze-dried to obtain the CdS nanoparticles.

[0060] Step (2): Preparation of CdS / ZIF-67 composite material

[0061] First, 32 mg of CdS nanoparticles were dispersed in 10 ml of methanol and homogenized by ultrasonication, and then 0.2379 g of CoCl 2 6(H 2 O) Dissolve in 50ml methanol, mix the two while stirring and continue to stir ...

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Abstract

The invention discloses a CdS/metallic organic frame composite photocatalysis material as well as a preparation method and application thereof. The composite photocatalysis material is prepared by modifying a metallic organic frame on the surfaces of CdS nanoparticles. The preparation method of the composite photocatalysis material comprises the following steps: firstly, synthesizing the CdS nanoparticles by using a solvent thermal method, and modifying the metallic organic frame on the surfaces of the CdS nanoparticles by using an in-situ heterogeneous deposition method, thereby obtaining theCdS/metallic organic frame composite photocatalysis material. Compared with conventional CdS, the CdS/metallic organic frame composite photocatalysis material has improved photoelectric stability, and conversion efficiency, circulation stability and catalysis selectivity of photocatalytic reduction of carbon dioxide.

Description

technical field [0001] The invention relates to a photocatalytic material, in particular to a CdS / metal organic framework composite photocatalytic material composed of a metal organic framework modified on the surface of CdS nanoparticles, and to the preparation of CdS by a solvothermal method combined with an in-situ heterogeneous deposition method The invention relates to a method for a composite photocatalytic material of a metal organic framework, and also relates to the application of a CdS / metal organic framework composite photocatalytic material in the catalytic reduction of carbon dioxide, belonging to the technical field of photocatalytic material preparation. Background technique [0002] The photocatalytic reaction was first discovered by Japanese scientists Fujishima and Honda in 1972, who used near-ultraviolet light to irradiate TiO 2 Electrodes, successfully splitting water into oxygen and hydrogen. With the deepening of photocatalytic research, more and more ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28B01J35/10C01B32/40
CPCB01J31/28B01J35/004B01J35/10B01J35/1004B01J2531/0213B01J2531/26B01J2531/845C01B32/40
Inventor 刘又年刘颖邓留
Owner CENT SOUTH UNIV
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