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a tio 2 -mofs photocatalyst and its preparation method and application

A technology of photocatalysts and photocatalytic materials, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problems of low activity, low mineralization rate, easy Carbon deposition and deactivation problems, to achieve the effect of simple operation, short cycle, rich pore structure

Active Publication Date: 2021-09-21
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the invention is to overcome TiO 2 Photocatalytic materials have problems such as low activity, low mineralization rate, and easy carbon deposition and deactivation when degrading VOCs. Provide a TiO that promotes rapid electron-hole separation and facilitates the diffusion of oxygen molecules. 2 -MOFs photocatalyst preparation method and its application

Method used

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  • a tio <sub>2</sub> -mofs photocatalyst and its preparation method and application
  • a tio <sub>2</sub> -mofs photocatalyst and its preparation method and application
  • a tio <sub>2</sub> -mofs photocatalyst and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0031] NH 2- Preparation of UiO-66: Add 0.05 g of zirconium tetrachloride and 0.08 g of 2-aminoterephthalic acid to 60 mL of dimethylformamide to obtain a mixed solution A, stir at 25 °C at 25 r / min for 10 min, then add 2 mL of glacial acetic acid solution to the mixed solution A, mix and stir for 10 min to obtain the mixed solution B, transfer the mixed solution B to the liner of the polytetrafluoroethylene reactor, and then put the polytetrafluoroethylene reactor The liner was placed in a high-pressure reactor, and hydrothermally reacted at 120 °C 0.18 Mpa for 24 h. After natural cooling, the precipitate was washed with dimethylformamide and methanol respectively, soaked in methanol and vacuum-dried at 100 °C for 12 h, and finally obtained NH 2 -UiO-66.

[0032] TiO 2 -NH 2 -Preparation of UiO-66: 0.25 gTiO 2 Added into 50 mL of methanol to obtain a mixed solution C, stirred at room temperature for 10 min, and then 0.75 g of NH 2 -UiO-66 was added to mixed solution C, ...

Embodiment 2

[0034] NH 2 - Preparation of UiO-66: Add 0.06 g of zirconium tetrachloride and 0.09 g of 2-aminoterephthalic acid to 50 mL of dimethylformamide to obtain a mixed solution A, stir at 30 °C at 25 r / min for 15 min, then add 4 mL of glacial acetic acid solution to the mixed solution A, mix and stir for 15 min to obtain the mixed solution B, transfer the mixed solution B to the liner of the polytetrafluoroethylene reactor, and then put the polytetrafluoroethylene reactor The liner was placed in a high-pressure reactor, and subjected to hydrothermal reaction at 120 °C 0.20 Mpa for 24 h, and then the solution was washed with dimethylformamide and methanol respectively, soaked in methanol and vacuum-dried at 110 °C for 10 h to finally obtain NH 2 -UiO-66.

[0035] TiO 2 -NH 2 -Preparation of UiO-66: 0.50 g TiO 2 Added into 50 mL of methanol to obtain a mixed solution C, stirred at room temperature for 10 min, and then 0.50 g of NH 2 -UiO-66 was added to mixed solution C, mixed an...

Embodiment 3

[0037] NH 2 - Preparation of UiO-66: Add 0.06 g of zirconium tetrachloride and 0.09 g of 2-aminoterephthalic acid to 60 mL of dimethylformamide to obtain a mixed solution A, stir at 26 °C at 25 r / min for 15 min, then add 4 mL of glacial acetic acid solution to the mixed solution A, mix and stir for 15 min to obtain the mixed solution B, transfer the mixed solution B to the liner of the polytetrafluoroethylene reactor, and then put the polytetrafluoroethylene reactor The liner was placed in a high-pressure reactor, and subjected to hydrothermal reaction at 120 °C 0.17 Mpa for 24 h, then the solution was washed with dimethylformamide and methanol respectively, soaked in methanol and vacuum-dried at 110 °C for 10 h, and finally NH 2 -UiO-66.

[0038] TiO 2 -NH 2 -Preparation of UiO-66: 1 g TiO 2 Added into 50 mL of methanol to obtain a mixed solution C, stirred at room temperature for 10 min, and then 0 g NH 2 -UiO-66 was added to the mixed solution C, mixed and stirred for ...

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Abstract

The invention discloses a TiO 2 ‑MOFs photocatalyst and its preparation method and application. The present invention adopts the method for solvent volatilization and evaporation, first TiO 2 Dispersed in a polar organic solvent, followed by adding MOFs materials, and finally TiO 2 ‑MOFs photocatalytic materials. TiO prepared by the present invention 2 ‑MOFs catalytic materials have a large specific surface area, rich and regular pore structure and charge in TiO 2 The rapid separation and transfer between MOFs and MOFs interface can promote the adsorption, mass transfer and electron-hole separation of VOCs, and finally significantly improve the efficiency, mineralization rate and anti-coking deactivation performance of photocatalytic degradation of VOCs. The prepared photocatalyst can be widely used in water pollution control, air pollution control and other fields.

Description

technical field [0001] The invention belongs to the technical field of functional materials, in particular to a TiO 2 -MOFs photocatalyst and its preparation method and application. Background technique [0002] with TiO 2 Photocatalytic technology represented by semiconductor materials can degrade pollutants in the environment into harmless CO at normal temperature and pressure. 2 and H 2 O has received extensive attention from researchers. However with TiO 2 When photocatalytic materials degrade VOCs, there are still problems such as low adsorption rate, low mineralization rate and easy carbon deposition and deactivation of materials, which have become the bottleneck restricting the development of photocatalytic technology. For the degradation of VOCs, VOCs molecules must first be adsorbed on the surface of the photocatalyst, then undergo a redox reaction, and finally desorb the final mineralized product from the surface of the catalyst. However, due to the low conce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38B01J31/22B01J37/10C02F1/30B01D53/00B01D53/86B01D53/72
CPCB01D53/007B01D53/8668B01D2257/708B01J31/1691B01J31/38B01J35/0013B01J35/004B01J37/10B01J2531/0213B01J2531/0241B01J2531/48C02F1/30Y02A50/20
Inventor 胡芸张金辉
Owner SOUTH CHINA UNIV OF TECH
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