A Novel Photocatalyst Controllable Preparation Method Based on Inorganic Ligand Modification

A photocatalyst and inorganic ligand technology, applied in the field of controllable preparation of new photocatalysts, can solve the problems of hindered reaction and activation, low catalytic activity of perovskite, lack of catalytic activation, etc., to facilitate large-scale industrial production, improve Stability and catalytic activity, effect of improving preparation purity and quality

Active Publication Date: 2021-12-17
ZHEJIANG NORMAL UNIVERSITY
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Problems solved by technology

[0004] The existing CsPbBr3 inorganic perovskite catalysts have low catalytic properties and poor stability, which cannot meet industrial applications
This is mainly caused by two reasons: 1) There are many organic ligands (such as oleylamine and oleic acid) on the surface of perovskite. These organic ligands will prevent various small molecules from approaching the surface of perovskite, hindering its reaction and activation. , and the presence of these organic ligands will cause the gradual decomposition of perovskite; 2) The catalytic activity of perovskite itself is low, and its surface lacks effective catalytic centers to quickly activate small molecules.

Method used

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  • A Novel Photocatalyst Controllable Preparation Method Based on Inorganic Ligand Modification
  • A Novel Photocatalyst Controllable Preparation Method Based on Inorganic Ligand Modification
  • A Novel Photocatalyst Controllable Preparation Method Based on Inorganic Ligand Modification

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Experimental program
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Effect test

Embodiment 1

[0049] see figure 1 , add cesium carbonate and oleic acid to octadecene, the ratio is 3.07mmol: 6mL: 40mL, and heat to 120°C in an argon atmosphere to obtain a mixed solution A, take lead bromide, oleic acid and oleylamine and add ten In octacene, the ratio is 1.88mmol: 5mL: 5mL: 50mL, heated to 165°C to obtain mixed solution B, add an appropriate amount of mixed solution A to mixed solution B, stir for 5s, cool to room temperature in an ice-water bath, centrifuge and filter The obtained solid is cesium lead bromine quantum dots (CsPbBr3-OL) in the oil phase. Weigh 5 mg of the prepared oil phase cesium lead bromine quantum dots, disperse them in 5 mL of ethyl acetate, and then add 40 μL, 20 mM ethanol-soluble Ammonium hexafluorophosphate, stirred in the dark for 30 minutes; centrifuged, dried in the air to obtain a yellow solid powder, which is CsPbBr3-PF6 quantum dots.

[0050] see figure 2 , take by weighing nickel chloride hexahydrate 30.90mg (0.13mmol), terpyridine 60.6...

Embodiment 2

[0055] CsPbBr3-PF6 quantum dot catalyst for photocatalytic reduction of carbon dioxide:

[0056] Weigh 5 mg of CsPbBr3-PF6 quantum dots prepared in Example 1 and dissolve them in 5 mL of ethyl acetate, add 30 μL of deionized water, transfer them to a 30 mL reactor, use a 300W xenon lamp as the light source, and simulate sunlight for photocatalytic carbon dioxide For the reduction experiment, samples were taken regularly, and the content of carbon monoxide and methane produced was analyzed by gas chromatography.

Embodiment 3

[0058] CsPbBr3-NitPy catalyst for photocatalytic reduction of carbon dioxide:

[0059] Weigh 5 mg of CsPbBr3-NitPy quantum dots prepared in Example 1, dissolve them in 5 mL of ethyl acetate, add 30 μL of deionized water, transfer them to a 30 mL reactor, use a 300W xenon lamp as the light source, and simulate sunlight for photocatalytic carbon dioxide For the reduction experiment, samples were taken regularly, and the content of carbon monoxide and methane produced was analyzed by gas chromatography.

[0060] see Figure 5 , when CsPbBr3-NitPy catalyst is used for photocatalytic reduction of carbon dioxide compared with CsPbBr3-PF6 quantum dots and CsPbBr3, the content of carbon monoxide and methane produced is significantly improved. The improvement and surface reconstruction, that is, the simultaneous realization of inorganic ligand modification and catalyst anchoring, increased the catalytic activity of the obtained composite for photocatalytic reduction of carbon dioxide ...

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Abstract

The invention discloses a novel photocatalyst controllable preparation method based on inorganic ligand modification, which belongs to the technical field of photocatalyst preparation. A novel photocatalyst controllable preparation method based on inorganic ligand modification can be pretreated by inorganic ligand The surface of the perovskite material, and the method of anchoring the catalytic active center on the surface, the inorganic ligand treatment in the present invention can effectively remove the organic ligand on the surface of the perovskite, so that it exposes more positions for molecular Catalyst anchoring; at the same time, bipyridyl nickel is anchored around the perovskite through the interaction of electrostatic attraction with the inorganic ligand, so as to achieve the purpose of regulating the photocatalytic activity of the perovskite, thus greatly improving the perovskite The stability and catalytic activity of the ore, and provide a dark preparation environment through the dark magnetic drive stirring device, improve the preparation purity and quality, this method also has the advantages of simple preparation process, low cost, and convenient large-scale industrial production .

Description

technical field [0001] The invention relates to the technical field of photocatalyst preparation, and more specifically, relates to a novel photocatalyst controllable preparation method based on inorganic ligand modification. Background technique [0002] Photocatalyst, in the popular sense, catalyst means catalyst, and photocatalyst, as the name implies, is photocatalyst. A catalyst is a chemical substance that changes the rate of a chemical reaction without itself participating in the reaction. Photocatalyst is a general term for chemical substances that can play a catalytic role under the excitation of photons. [0003] At present, the depletion of fossil energy and the effect of greenhouse gases are two major problems facing mankind. Using catalysts to convert solar energy into chemicals with high added value (such as converting carbon dioxide into methane, etc.) and storing them is an effective way to solve the above problems . At present, the most widely used are ox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/26B01J27/14
CPCB01J31/26B01J27/14B01J35/004
Inventor 王靳张巧文陈周杰李正全
Owner ZHEJIANG NORMAL UNIVERSITY
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