Process for preparing mesoporous TiOw powder and film photocatalyst by sol-gel method

A mesoporous titanium dioxide and photocatalyst technology, which is applied in the fields of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of difficulty in preparation, difficulty in mass production, destruction of mesoporous structure, etc. simple craftsmanship

Inactive Publication Date: 2002-04-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing preparation of mesoporous TiO 2 There are two main methods for powder and thin film photocatalysts: (1) Using octadecylamine as a template, using hydrothermal synthesis to prepare mesoporous TiO 2 The method of powder photocatalyst; (2) using block copolymer as template agent, utilizing organic titanate or titanium tetrachloride sol-gel method to prepare mesoporous TiO 2 The method of powder and film; wherein in the method (1) due to the use of octadecylamine as a template, after hydrothermal synthesis, the removal of the template is very difficult, it is easy to cause the destruction of the mesoporous structure, and it is difficult to prepare a thin film photocatalyst
The mesoporous photocatalyst prepared by method (2) has a good pore structure, but not only the removal of the template agent is difficult, but also the template agent is expensive, and it is difficult to mass-produce

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] With n-butyl titanate [Ti(OC 4 h 9 ) 4 ] as the raw material, the raw material, low-carbon alcohol (methanol, ethanol, propanol), diethanolamine and water are formulated into a solution according to the ratio of 1:10:0.125:0.05625, and an amount of Ti(OC 4 h 9 ) 4 When preparing PEG200 with a molar ratio of 2%, first add water and diethanolamine to part of the alcohol and mix evenly, and the other part of alcohol is used to dissolve PEG, and then n-butyl titanate Ti(OBu) 4 Before the solution is added dropwise to the mixed solution, the PEG alcohol solution is finally added to obtain a light yellow uniform and transparent solution, which is sealed and allowed to stand for 5 days to gel to obtain a transparent precursor sol. Evaporate the solvent to obtain a xerogel, and then perform calcination under air atmosphere conditions with an initial heating rate of 10°C / min, and then calcine at a temperature of 400°C for 2 hours to form the mesoporous TiO of the present inv...

Embodiment 2

[0015] With n-butyl titanate [Ti(OC 4 h 9 ) 4 ] as the raw material, the raw material, low-carbon alcohol (methanol, ethanol, propanol), diethanolamine and water are formulated into a solution according to the ratio of 1:10:0.125:0.05625, and an amount of Ti(OC 4 h 9 ) 4 When preparing PEG200 with a molar ratio of 10%, first add water and diethanolamine to part of the alcohol and mix evenly, and the other part of alcohol is used to dissolve PEG, and then n-butyl titanate Ti(OBu) 4 Before the solution is added dropwise to the mixed solution, the PEG alcohol solution is finally added to obtain a light yellow uniform and transparent solution, which is sealed and allowed to stand for 5 days to gel to obtain a transparent precursor sol. Evaporate the solvent to obtain a xerogel, and then perform calcination under air atmosphere conditions with an initial heating rate of 10°C / min, and then calcine at a temperature of 400°C for 2 hours to form the mesoporous TiO of the present in...

Embodiment 3

[0017] With n-butyl titanate [Ti(OC 4 h 9 ) 4 ] as the raw material, the raw material, low-carbon alcohol (methanol, ethanol, propanol), diethanolamine and water are formulated into a solution according to the ratio of 1:10:0.125:0.05625, and an amount of Ti(OC 4 h 9 ) 4 For PEG200 with a molar ratio of 25%, first add water and diethanolamine to part of the alcohol and mix evenly, and the other part of alcohol is used to dissolve PEG, and then add n-butyl titanate Ti(OBu) 4 Before the solution is added dropwise to the mixed solution, the PEG alcohol solution is finally added to obtain a light yellow uniform and transparent solution, which is sealed and allowed to stand for 5 days to gel to obtain a transparent precursor sol. Evaporate the solvent to obtain a xerogel, and then perform calcination under air atmosphere conditions with an initial heating rate of 10°C / min, and then calcine at a temperature of 400°C for 2 hours to form the mesoporous TiO of the present invention...

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Abstract

A process for preparing the photocatalyst of mesoporous TiO2 powder or film by the sol-gel method includes such steps as preparing solution from n-butyl titanate, low-carbon alcohol and diethanolamine, adding polyethyleen glycol to obtain transparent precursor sol, evaporating solvent out, drying, crushing, and calcining to obtain the photocatalyst. It has high photocatalytic efficiency and activity. The mesoporous powder and film prepared by the said process has vertically open porous structure which benefits the photocatalytic reaction and high activity.

Description

Technical field: [0001] The invention relates to a method for preparing mesoporous titanium dioxide powder and thin-film photocatalyst by using a sol-gel method, belonging to the technical field of chemistry and chemical engineering. Background technique: [0002] Nano-TiO prepared by common method 2 Photocatalysts, especially thin-film photocatalysts, have relatively weak photocatalytic activity due to lack of pore structure. Existing preparation of mesoporous TiO 2 There are two main methods for powder and thin film photocatalysts: (1) Using octadecylamine as a template, using hydrothermal synthesis to prepare mesoporous TiO 2 The method of powder photocatalyst; (2) using block copolymer as template agent, utilizing organic titanate or titanium tetrachloride sol-gel method to prepare mesoporous TiO 2 The method of powder and film; wherein in the method (1) due to the use of octadecylamine as a template, after hydrothermal synthesis, the removal of the template is very d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J37/03C01G23/053
Inventor 朱永法张利谭瑞琴
Owner TSINGHUA UNIV
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