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A kind of preparation method of nitrogen-doped titanium dioxide powder with network porous structure

A reticular porous, titanium dioxide technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of lack of crystallinity, improved visible light activity, low specific surface area, etc., and achieve low cost. , Good visible light catalytic activity, large specific surface area

Active Publication Date: 2015-11-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the previous literature reports on the preparation of nitrogen-doped titanium dioxide powder at low temperature, the lack of crystallinity caused by low temperature, the low specific surface area caused by ordinary microscopic morphology, etc., lead to the need to greatly improve the visible light activity.

Method used

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  • A kind of preparation method of nitrogen-doped titanium dioxide powder with network porous structure
  • A kind of preparation method of nitrogen-doped titanium dioxide powder with network porous structure
  • A kind of preparation method of nitrogen-doped titanium dioxide powder with network porous structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Extraction of nitrogen source: select freshwater mussels with a shell age of 5 years and wash them. Use a scalpel to incise the closure muscles on both sides of the shell, place the shell upside down on a clean tray for 10 minutes, and allow the water in the shell to fully drain. Gently tear off the mantle in the shell, and quickly draw the mantle liquid into the centrifuge tube with a pipette gun. The extracted mantle fluid was stored at -70°C.

[0039] (2) Preparation of the precipitation mixture: add 25ml of the mantle solution with a protein concentration of 1250μg / ml to 5ml of tetrabutyl titanate dropwise, and stir thoroughly for 1 hour (at a speed of 800r / min) to obtain a white precipitate and mantle Precipitation mixture of membrane fluid.

[0040] (3) Mineralization at room temperature: Put the obtained precipitation mixture at room temperature for 12 hours to allow the mantle solution to fully interact with the white precipitate to obtain TiO 2 precipita...

Embodiment 2

[0047] (1) Extraction of nitrogen source: select freshwater mussels with a shell age of 3 years and wash them. Use a scalpel to incise the closing muscles on both sides of the shell, and place the shell upside down on a clean tray for 20 minutes to allow the water in the shell to fully drain. Gently tear off the mantle in the shell, and quickly draw the mantle liquid into the centrifuge tube with a pipette gun. The extracted mantle fluid was stored at -70°C.

[0048] (2) Preparation of the precipitation mixture: 5ml of the mantle solution with a protein concentration of 800μg / ml was added dropwise to 0.5ml of tetrabutyl titanate, fully stirred for 2 hours (rotating at 1000r / min), and a white precipitate and Precipitation mixture of mantle fluid.

[0049] (3) Mineralization at room temperature: Put the obtained precipitation mixture at room temperature for mineralization for 18 hours, so that the mantle solution and the white precipitate can fully interact to obtain TiO 2 pr...

Embodiment 3

[0054] (1) Extraction of nitrogen source: select freshwater mussels with a shell age of 6 years and wash them. Place the shells upside down in the cleaned tray for 15 minutes to allow the water in the shells to fully drain. Use a scalpel to incise the obturator muscles on both sides of the shell, gently tear off the mantle in the shell, and use a pipette to quickly absorb the mantle liquid into the antifreeze centrifuge tube. The extracted mantle fluid was stored at -70°C.

[0055] (2) Preparation of the precipitation mixture: add 14ml of the mantle solution with a protein concentration of 400μg / ml to 2ml of tetrabutyl titanate dropwise, and stir thoroughly for 2 hours (at a speed of 1200r / min) to obtain a white precipitate and mantle Precipitation mixture of membrane fluid.

[0056] (3) Mineralization at room temperature: Put the obtained precipitation mixture at room temperature for 24 hours to allow the mantle solution to fully interact with the white precipitate to obtai...

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Abstract

The invention belongs to the technical field of TiO2 (titanium dioxide) photocatalysis. A preparation method for nitrogen-doped titanium dioxide powder of a reticulated porous structure is characterized by comprising the following steps: (1) extracting a nitrogen source, namely, selecting freshwater mussels at the ages of 2 to 6 years, and sucking covering liquid into a centrifugal pipe by using a pipette; (2) preparing mixed precipitate liquid, namely, weighing 0.5 to 5ml of tetrabutyl titanate in a beaker, measuring the covering liquid according to the volume ratio of the covering liquid to the tetrabutyl titanate equals being (5-10) to1, and dripping the covering liquid into tetrabutyl titanate to obtain the mixed precipitate liquid; (3) carrying out room-temperature mineralization; (4) carrying out hydrothermal synthesis of nitrogen-doped TiO2 powder; and (5) extracting the nitrogen-doped TiO2 powder. The nitrogen-doped TiO2 powder is successfully prepared at a low temperature by taking the covering liquid of living organisms as a biological template and the nitrogen source simultaneously, and adjusting the microstructure and the crystal form of the TiO2. According to the preparation method, the temperature is low, the cost is low, and the operation is easy; the prepared nitrogen-doped TiO2 powder has a bionic microstructure, namely nanoparticles assembled reticulated porous structure, and is large in specific area and high in crystallinity.

Description

technical field [0001] The invention belongs to titanium dioxide (TiO 2 ) photocatalytic technology field, particularly a kind of nitrogen-doped TiO 2 Powder preparation method. Background technique [0002] In recent years, in order to utilize solar energy, an inexhaustible and inexhaustible clean energy source, more and more researchers have begun to pay attention to light-responsive photocatalysts. Among them, TiO 2 As a kind of semiconductor photocatalyst, the application of solar energy conversion and storage, degradation of organic matter, sterilization, sewage treatment, air purification and other aspects has aroused people's more and more extensive research interest. But due to TiO 2 The band gap is large and can only absorb ultraviolet light. Ultraviolet light only accounts for 5% of sunlight, while the visible light which accounts for the vast majority has not been absorbed by TiO 2 absorb. Therefore, how to make TiO 2 The absorption spectrum extended to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/10
Inventor 傅正义曾辉解晶晶于洪舰王真珍王为民王皓
Owner WUHAN UNIV OF TECH
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