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High-energy ball-milling preparation of visual responsing titania light catalyst

A technology of titanium dioxide and photocatalyst, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low catalytic efficiency of visible light, achieve high photocatalytic activity, increase specific surface area, and particle size small effect

Inactive Publication Date: 2006-08-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But TiO 2 It is a semiconductor compound with a wide band gap (Eg=3.2eV), which can only be excited by ultraviolet light (λ<387nm), while the solar radiation energy that actually reaches the surface is concentrated in the visible light wavelength range of 460-500nm, and the ultraviolet component (300-400nm) Therefore, how to efficiently use natural light for photocatalytic reactions, and the development of highly efficient photocatalysts that can be excited by visible light is increasingly becoming a research difficulty and hotspot.
However, the currently prepared TiO 2 The visible light catalytic efficiency of the catalyst is still low, so it is necessary to seek other processes to prepare TiO with higher visible light activity. 2 catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Stir and mix 4ml tetraethyl orthosilicate and 40ml ethanol solution for 15 minutes to prepare tetraethyl orthosilicate ethanol mixture.

[0018] 2) Prepare 2ml of hydrochloric acid, 6ml of water and 20ml of ethanol as a hydrolysis catalyst solution, add it to the above-mentioned ethyl orthosilicate-ethanol mixture, and stir vigorously for 5 hours to obtain SiO 2 Sol.

[0019] 3) Weigh 28.5g TiO 2 The powder is impregnated in the above SiO 2 Sol, get SiO 2 with TiO 2 The impregnating mixture with a molar ratio of 0.05:1 was stirred and allowed to stand for 1 day.

[0020] 4) The above fully impregnated mixture was heat-treated at 500 °C for 2 hours to obtain SiO 2 / TiO 2 Composite powder.

[0021] 5) Weigh 4g of the above SiO 2 / TiO 2 The composite powder was mixed with 0.6 g of urea, and mechanically milled on a GN-2 high-energy ball mill for 5 hours. The weight ratio of the balls to the material was 10:1, and the milling tank rotated at 580 rpm.

[0022] 6...

Embodiment 2

[0024] 1) Stir and mix 4ml tetraethyl orthosilicate and 80ml ethanol solution for 15 minutes to prepare a mixture of tetraethyl orthosilicate and ethanol.

[0025] 2) Prepare 4ml of hydrochloric acid, 10ml of water and 30ml of ethanol as a hydrolysis catalyst solution, add it to the above-mentioned ethyl orthosilicate-ethanol mixture, and stir vigorously for 10 hours to obtain SiO 2 Sol.

[0026] 3) Weigh 85.5g TiO 2 The powder is impregnated in the above SiO 2 Sol, get SiO 2 with TiO 2 The impregnation mixture with a molar ratio of 0.15:1 was stirred and allowed to stand for 2 days.

[0027] 4) The above impregnated mixture was heat-treated at 600 °C for 4 hours to obtain SiO 2 / TiO 2 Composite powder.

[0028] 5) Weigh 4g of the above SiO 2 / TiO 2 The composite powder was mixed with 0.8 g of urea, and mechanically milled on a GN-2 high-energy ball mill for 8 hours, the weight ratio of the balls to the material was 20:1, and the milling tank rotated at 650 rpm.

[0...

Embodiment 3

[0031] 1) Stir and mix 4ml tetraethyl orthosilicate and 60ml ethanol solution for 15 minutes to prepare a mixture of tetraethyl orthosilicate and ethanol.

[0032] 2) 3ml of hydrochloric acid, 8ml of water and 25ml of ethanol were prepared as a hydrolysis catalyst solution, added to the above-mentioned ethyl orthosilicate-ethanol mixture, and stirred vigorously for 8 hours to obtain SiO 2 Sol.

[0033] 3) Weigh 57g TiO 2 The powder is impregnated in the above SiO 2 Sol, get SiO 2 with TiO 2 The impregnating mixture with a molar ratio of 0.10:1 was stirred and allowed to stand for 1 day.

[0034] 4) The above impregnated mixture was heat-treated at 500 °C for 3 hours to obtain SiO 2 / TiO2 Composite powder.

[0035] 5) Weigh 4g of the above SiO 2 / TiO 2 The composite powder was mixed with 0.6 g of urea, and mechanically milled on a GN-2 high-energy ball mill for 10 hours, the weight ratio of the balls to the material was 15:1, and the speed of the milling tank was 520 rp...

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PUM

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Abstract

A process for preparing TiO2 photocatalyst responsive to visual light by high-energy ball grinding method includes such steps as preparing SiO2 sol from ethyl silicate by sol-gel method, immersing TiO2 powder in SiO2 sol, calcining to obtain SiO2 / TiO2 powder, proportional mixing it with urea, ball grinding, and heat treating at 400-500 deg.C. Its advantaegs are excellent absorption to visual light and high photocatalytic activity.

Description

technical field [0001] The invention relates to a preparation method of titanium dioxide photocatalyst, in particular to a preparation method of high-energy ball milling of titanium dioxide powder with high visible light catalytic performance, belonging to the field of new catalyst materials. Background technique [0002] TiO since 1972 2 Since the single-crystal electrode photo-splitting of water was reported, heterogeneous photocatalytic water-splitting hydrogen production once set off an upsurge worldwide. Although the progress was slow due to the low hydrogen yield, the exploration in this area has not been interrupted. In the removal of various refractory pollutants, semiconductor photocatalysis has shown strong oxidative properties, complete mineralization of pollutants, and direct use of sunlight. Great progress has been made in recent years. In addition, applications of heterogeneous photocatalysis in health care, precious metal recovery, solar cells, and chemical s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J37/00
Inventor 顾明元程萍
Owner SHANGHAI JIAO TONG UNIV
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