Preparation method for nitrogen-doped TiO2 (titanium dioxide) powder of reticulated porous structure

A reticular porous, titanium dioxide technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as lack of crystallinity, low specific surface area, and improved visible light activity, and achieve low cost. , Simple operation, widely distributed effect

Active Publication Date: 2014-09-03
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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  • Preparation method for nitrogen-doped TiO2 (titanium dioxide) powder of reticulated porous structure
  • Preparation method for nitrogen-doped TiO2 (titanium dioxide) powder of reticulated porous structure
  • Preparation method for nitrogen-doped TiO2 (titanium dioxide) powder of reticulated porous structure

Examples

Experimental program
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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 precipitation mixture: 25 ml of mantle solution with a protein concentration of 1250 mg / ml was added dropwise to 5 ml of tetrabutyl titanate, and fully stirred for 1 h (rotation speed: 800 r / min). A precipitation mixture of white precipitate and mantle solution was obtained.

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

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 precipitation mixture: 5 ml of mantle solution with a protein concentration of 800 mg / ml was added dropwise to 0.5 ml of tetrabutyl titanate, and fully stirred for 2 h (rotating speed at 1000 r / min). A precipitation mixture of white precipitate and mantle solution was obtained.

[0049] (3) Mineralization at room temperature: Put the obtained precipitation mixture at room temperature for 18 h to allow the mantle solution to fully interact with the white precipitate to obtain TiO 2 precipitati...

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 precipitation mixture: 14 ml of mantle solution with a protein concentration of 400 mg / ml was added dropwise to 2 ml of tetrabutyl titanate, and fully stirred for 2 h (1200 r / min), A precipitation mixture of white precipitate and mantle solution was obtained.

[0056] (3) Mineralization at room temperature: Put the obtained precipitation mixture at room temperature for 24 h to allow the mantle solution to fully interact with the white precipitate to obtain TiO 2 precipitation m...

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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, especially 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, and the visible light which accounts for most of it has not been absorbed by TiO 2 absorb. Therefore, how to make TiO 2 The absorption spectrum extended to the visible l...

Claims

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Application Information

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Patent Type & Authority Applications(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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