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Nanometer titanium dioxide photocatalyst co-doped with boron and other elements and preparation method thereof

A nano-titanium dioxide and photocatalyst technology, applied in the fields of environmental chemical industry and new materials, can solve the problems that the absorption band-edge red shift is not far enough, difficult to scale industrial production, and high equipment requirements

Active Publication Date: 2009-12-09
宁波曦昀高分子新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing literature on doped modified titanium dioxide either has high manufacturing costs and high equipment requirements, making it difficult to achieve large-scale industrial production; or the red shift of the absorption band edge of the prepared doped titanium dioxide is not far enough, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Dissolve 0.001mol boric acid and 0.002mol ammonium fluoride in 20mL distilled water and 15mL glacial acetic acid mixture, add 80mL ethanol to obtain solution A; dissolve 0.1mol n-butyl titanate in 80mL absolute ethanol to obtain solution B; magnetically stir Add solution B dropwise to solution A within 60 minutes; continue stirring for 1 hour after the dropwise addition, and age the resulting sol at room temperature for 72 hours, then dry it in vacuum at 80°C for 10 hours; grind the resulting sol in an agate mortar Dry the gel to a particle size of about 10nm, then put the ground dry gel into a muffle furnace, and calcinate it at 600°C for 2 hours, and grind the calcined powder again in an agate mortar to obtain a light yellow Visible light responsive boron and nitrogen co-doped nano-titanium dioxide has a particle size of 10.0nm, and the doped titanium dioxide contains 1% boron atoms and 2% nitrogen atoms (the molar ratio relative to titanium atoms).

[0022] Verificat...

Embodiment 2

[0024] Dissolve 0.002mol boric acid, 0.002mol iron(III) nitrate nonahydrate and 0.002mol cerium(III) nitrate hexahydrate in a mixture of 20mL distilled water and 15mL glacial acetic acid, add 80mL ethanol to obtain solution A; Dissolve the ester in 80mL of absolute ethanol to obtain solution B; add solution B dropwise to solution A within 60 minutes of magnetic stirring; Dry under vacuum for 10 hours; Grind the resulting xerogel in an agate mortar until the particle size is about 10nm, then put the ground xerogel in a muffle furnace, and calcinate it at 500°C for 2 hours, and the calcined The powder was ground again in an agate mortar to obtain visible light-responsive boron, iron and cerium co-doped nano-titanium dioxide with a particle size of 11.2nm. This doped titanium dioxide contained 2% boron atoms, 2% iron atoms and 2% Cerium atoms (molar ratio relative to titanium atoms).

[0025] Verification of visible light catalytic activity: Weigh 0.05g of boron, iron and cerium...

Embodiment 3

[0027] Dissolve 0.0005mol of boric acid and 0.0005mol of iron(III) nitrate nonahydrate in 10mL of distilled water and 8mL of glacial acetic acid mixture, add 30mL of ethanol to obtain solution A; dissolve 0.05mol of n-butyl titanate and 3.12g of orthosilicate ethyl ester Obtain solution B in 50mL of absolute ethanol; add solution B dropwise to solution A within 40 minutes of magnetic stirring; continue stirring for 2 hours after the dropwise addition, and age the resulting sol at room temperature for 72 hours, then vacuum at 80°C Dry for 10 hours; Grind the resulting xerogel in an agate mortar until the particle size is about 10nm, then put the ground xerogel in a muffle furnace, and calcinate it at 600°C for 2 hours, and put the calcined powder in Grinding again in an agate mortar to obtain visible light-responsive boron and iron co-doped nano-titanium dioxide / silicon dioxide with a particle size of 6.2nm. This doped titanium dioxide contains 1% boron atoms, 1% iron atoms and ...

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Abstract

The invention relates to a nanometer titanium dioxide photocatalyst co-doped with boron and other elements and a preparation method thereof. The method uses titanate and boric acid as a titanium source and a boron source; the other doped elements comprise one or more of transition metal, rare-earth metal or nonmetal; and the method adopts acetic acid, nitric acid or citric acid as a hydrolysis catalyst and a mixture of alcohol and water as a reaction system and prepares the nanometer titanium dioxide photocatalyst co-doped with the boron and the other elements by a sol-gel reaction and calcinations. The nanometer titanium dioxide co-doped with the boron and other elements prepared by the method can absorb visible light and has catalytic activity of the visible light.

Description

technical field [0001] The invention relates to a visible light responsive titanium dioxide photocatalyst and a preparation method thereof, in particular to a visible light responsive boron and other element co-doped nano titanium dioxide photocatalyst and a preparation method thereof, belonging to the technical fields of environmental chemical industry and new materials. Background technique [0002] In the field of environmental chemistry, titanium dioxide has shown broad application prospects in photocatalysis due to its superior properties. However, titanium dioxide is a wide-bandgap semiconductor (the band gap of anatase titanium dioxide is 3.2eV), and only ultraviolet light can make titanium dioxide undergo electronic transitions, thereby generating electron-hole pairs. However, ultraviolet light only accounts for about 5% of sunlight. Therefore, preparing titanium dioxide catalysts with visible light catalytic activity by modifying titanium dioxide is a research hotsp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/00B01J21/06B01J21/02B01J23/83B01J23/745B01J23/755B01J23/10B01J37/00
Inventor 凌钦才孙建中叶泉友王依建毛丽群
Owner 宁波曦昀高分子新材料有限公司
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