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Photocatalyst and preparation method and application thereof

A technology of photocatalyst and hydrothermal reaction, applied in the field of photocatalysis, to achieve the effects of improving catalytic activity, photocatalytic performance and simple preparation process

Active Publication Date: 2019-10-15
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of MOFs in photocatalysis, especially in the field of photocatalytic water splitting to produce hydrogen, is still in its infancy. More in-depth and systematic research is needed on the application of MOFs in photocatalytic splitting of water to produce hydrogen.

Method used

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  • Photocatalyst and preparation method and application thereof
  • Photocatalyst and preparation method and application thereof
  • Photocatalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] This embodiment provides a series of photocatalyst NH 2 - MIL-125, the preparation method of which is as follows.

[0030] Prepare 10mL N,N-dimethylformamide and methanol mixed solution (V N,N-二甲基甲酰胺 :V 甲醇 =9:1), adding the total moles of 2-aminoterephthalic acid and 3-aminoisobenzoic acid mixed ligand (the molar ratio of 3-aminoisobenzoic acid in the ligand is x), fully stirred and dissolved After that, 1 mmol tetrabutyl titanate was added, stirred at room temperature for 30 min, then transferred to a 50 mL polytetrafluoroethylene hydrothermal reactor, and reacted at 150° C. for 3 days. After the hydrothermal reaction is completed, the product is separated by suction filtration, washed three times with N,N-dimethylformamide and methanol, and the obtained product is dried in a blast oven at 120°C for 1 day to obtain the defective NH 2 -MIL-125-x photocatalyst, x is the molar ratio of 3-aminoisobenzoic acid in the ligand, specifically 0% (i.e. pure NH 2 -MIL-125), 4%...

Embodiment 2

[0032] This embodiment provides a photocatalyst NH 2 -MIL-125-5%, which is prepared as follows.

[0033] Prepare 10mL N,N-dimethylformamide and methanol mixed solution (V N,N-二甲基甲酰胺 :V 甲醇 =9:1), adding total moles of 2-aminoterephthalic acid and 3-aminoisobenzoic acid mixed ligand (the molar ratio of 3-aminoisobenzoic acid in the mixed ligand is 5%), fully After stirring and dissolving, 1 mmol of tetraethyl titanate was added, stirred at room temperature for 30 min, then transferred to a 50 mL polytetrafluoroethylene hydrothermal reaction kettle, and reacted at 180° C. for 16 h. After the hydrothermal reaction is completed, the product is separated by suction filtration, washed three times with N,N-dimethylformamide and methanol, and the obtained product is dried in a blast oven at 120°C for 1 day to obtain the defective NH 2 - MIL-125-5% photocatalyst.

Embodiment 3

[0035] This embodiment provides a photocatalyst NH 2 -MIL-125-5%, which is prepared as follows.

[0036] Prepare 10mL N,N-dimethylformamide and methanol mixed solution (V N,N-二甲基甲酰胺 :V 甲醇 =9:1), adding a total molar number of 2-aminoterephthalic acid and 3-aminoisobenzoic acid mixed ligand (the molar ratio of 3-aminoisobenzoic acid in the mixed ligand is 5%), fully After stirring and dissolving, 1 mmol tetraisopropyl titanate was added, stirred at room temperature for 30 min, then transferred to a 50 ml polytetrafluoroethylene hydrothermal reaction kettle, and reacted at 100°C for three days. After the hydrothermal reaction is completed, the product is separated by suction filtration, washed three times with N,N-dimethylformamide and methanol, and the obtained product is dried in a blast oven at 120°C for 1 day to obtain the defective NH 2 - MIL-125-5% photocatalyst.

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Abstract

The invention relates to a photocatalyst and a preparation method and application thereof. The preparation method comprises the following steps: mixing a ligand solution and titanate, stirring, and carrying out hydrothermal reaction to obtain the photocatalyst; the ligand solution is a mixed solution of 2-aminoterephthalic acid and 3-aminobenzoic acid, and the mole fraction of the 3-aminobenzoic acid in the ligand is 4-6%. According to the invention, a novel MOFs photocatalytic material is prepared by a mixed ligand method, the photocatalytic performance of the photocatalyst can be adjusted byadjusting the ratio of the two ligands, a novel synthesis method of the photocatalyst is provided, the catalytic activity of the MOFs photocatalyst is effectively improved, and the morphology of theMOFs photocatalyst is regulated. Compared with a pure MOFs photocatalyst, the photocatalytic performance of the defective MOFs obtained by the preparation method is obviously improved, and the preparation process is simple.

Description

technical field [0001] The invention relates to the field of photocatalysis, in particular to a photocatalyst and its preparation method and application. Background technique [0002] Photocatalysis is a green economical and environmentally friendly technology, because it can effectively use solar energy and is considered to be one of the most promising technologies to solve the energy crisis in the 21st century. At present, it has been applied in sewage treatment, air purification, carbon dioxide reduction, water splitting hydrogen production and other fields. Metal-Organic Frameworks (MOFs) are porous materials formed by metal clusters and organic ligands through coordination bonds. Due to the unique structure of MOFs, the porosity, specific surface area and chemical properties can be changed by changing the metal cluster or ligand type. At present, MOFs have been widely used in the fields of gas adsorption, gas separation, gas storage and catalysis. In the field of cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22C01B3/04
CPCB01J31/1691B01J31/223B01J31/1805C01B3/042B01J2531/46C01B2203/0277B01J35/39Y02E60/36
Inventor 王新林碧云陈志鸿
Owner SOUTH CHINA NORMAL UNIVERSITY
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