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Metal-organic framework-supported titanium dioxide photocatalytic material and preparation method thereof

A photocatalytic material, titanium dioxide technology, applied in the field of nanocomposite materials and photocatalysis, can solve few problems, achieve the effect of short reaction cycle, simple operation process and mild reaction conditions

Active Publication Date: 2021-07-09
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few studies on how to use the carboxyl bidentate chelate structure Fe-based metal-organic frameworks to bind TiO and enhance its photocatalytic activity.

Method used

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  • Metal-organic framework-supported titanium dioxide photocatalytic material and preparation method thereof
  • Metal-organic framework-supported titanium dioxide photocatalytic material and preparation method thereof
  • Metal-organic framework-supported titanium dioxide photocatalytic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Fully dissolve 9g of glucose in 60mL of deionized water, then react the mixed solution in an autoclave at 190°C for 2h; Dry in a vacuum oven at 80°C for 12 hours to obtain carbon nanospheres.

[0032] (2) Disperse 0.4 g of carbon nanospheres prepared in step (1) and 0.45 mL of water in 72 mL of absolute ethanol to form suspension A. Disperse 0.45 mL of tetrabutyl titanate in 10 mL of absolute ethanol to obtain solution B, and slowly drop B into A. Then, the suspension was stirred for a further 30 minutes. Finally, the suspension was refluxed at 80 °C for 5 h. After cooling, the brown product was centrifuged, washed three times with deionized water and absolute ethanol, and dried at 80° C. for 12 h in a vacuum drying oven.

[0033] (3) The product prepared in step (2) was heated to 500 °C at a heating rate of 5 °C / min using a muffle furnace, and then kept for 2 h to remove the carbon core, and finally obtained titanium dioxide hollow nanospheres with oxygen vacanc...

Embodiment 2

[0037] (1) Fully dissolve 9g of glucose in 60mL of deionized water, then react the mixed solution in an autoclave at 190°C for 2h; Dry in a vacuum oven at 80°C for 12 hours to obtain carbon nanospheres.

[0038] (2) Disperse 0.4 g of carbon nanospheres prepared in step (1) and 0.45 mL of water in 72 mL of absolute ethanol to form suspension A. Disperse 0.45 mL of tetrabutyl titanate in 10 mL of absolute ethanol to obtain solution B, and slowly drop B into A. Then, the suspension was stirred for a further 30 minutes. Finally, the suspension was refluxed at 80 °C for 5 h. After cooling, the brown product was centrifuged, washed three times with deionized water and absolute ethanol, and dried at 80° C. for 12 h in a vacuum drying oven.

[0039] (3) The product prepared in step (2) was kept at 500 °C for 2 h at a heating rate of 5 °C / min using a muffle furnace to remove carbon nuclei, and finally obtained titanium dioxide hollow nanospheres with oxygen vacancies.

[0040] (4) ...

Embodiment 3

[0045] (1) Fully dissolve 9g of glucose in 60mL of deionized water, then react the mixed solution in an autoclave at 190°C for 2h; Dry in a vacuum oven at 80°C for 12 hours to obtain carbon nanospheres.

[0046] (2) Disperse 0.4 g of carbon nanospheres prepared in step (1) and 0.45 mL of water in 72 mL of absolute ethanol to form suspension A. Disperse 0.45 mL of tetrabutyl titanate in 10 mL of absolute ethanol to obtain solution B, and slowly drop B into A. Then, the suspension was stirred for a further 30 minutes. Finally, the suspension was refluxed at 80 °C for 5 h. After cooling, the brown product was centrifuged, washed three times with deionized water and absolute ethanol, and dried at 80° C. for 12 h in a vacuum drying oven.

[0047] (3) The product prepared in step (2) was kept at 500 °C for 2 h at a heating rate of 5 °C / min using a muffle furnace to remove carbon nuclei, and finally obtained titanium dioxide hollow nanospheres with oxygen vacancies.

[0048] (4) ...

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Abstract

The invention discloses a metal-organic framework-loaded titanium dioxide photocatalytic material and a preparation method thereof. Specifically, the interface conjugation technology is used to connect titanium dioxide and the metal-organic framework by using a carboxyl bidentate structure to prepare a titanium dioxide / metal-organic framework heterojunction photocatalyst. The catalyst can effectively improve the transfer ability and photocatalytic activity of photogenerated electrons from metal organic framework materials to titanium dioxide. The preparation method and process realized by the invention are simple, and the reaction conditions are mild; the raw materials and equipment are cheap and easy to obtain, and the cost is low; the synthesis time is short, the efficiency is high, and it is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of nanocomposite materials and photocatalysis, and in particular relates to a method for preparing a metal-organic framework photocatalyst supported on the surface of hollow titanium dioxide. [0002] technical background [0003] Due to the development of industry and rapid population growth, water pollution is a critical issue of general concern. After decades of in-depth research, semiconductor photocatalysis technology has developed into an efficient technology for treating wastewater. TiO2 is one of the most promising semiconductor photocatalytic materials for photocatalytic degradation of pollutants due to its low cost, nontoxicity, recyclability and high stability. However, the large bandgap limits its response to ultraviolet light. Meanwhile, the higher recombination rate of photogenerated electrons leads to lower quantum efficiency. Scholars have designed various structures to solve these problems, such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22B01J35/08C02F1/30C02F101/38
CPCB01J31/1691B01J31/2217C02F1/30B01J2531/842C02F2305/10C02F2101/40B01J35/51B01J35/39
Inventor 董文钧马雨威海广通王戈
Owner UNIV OF SCI & TECH BEIJING
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