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a tio 2 nanotube composite sio 2 Airgel-based photocatalytic material and preparation method thereof

A photocatalytic material and nanotube composite technology, which is applied in the field of TiO2 nanotube composite SiO2 aerogel-based photocatalytic material and its preparation, can solve the problems of small aspect ratio, insignificant catalytic efficiency, low regeneration and utilization efficiency, etc. Achieve the effect of high yield, good product purity and stability, and uniform product size

Inactive Publication Date: 2017-07-04
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But precisely because of TiO 2 Nanotubes have a high specific surface area, are nanoscale in both dimensions, and have a small aspect ratio, which makes them easy to entangle and adsorb and agglomerate into micron-scale aggregates, so that ultraviolet light cannot pass through, and can only produce catalytic effects on the surface
Secondly, because the tube structure will overlap and conduct with each other at the nanoscale, the potential difference generated by the electronic transition will quickly recombine and tend to an equilibrium state, making its catalytic efficiency insignificant.
In addition, due to the small size of nanotube materials, TiO is mainly used in applied research at present. 2 The nanotubes are directly placed in the pollutants, and after catalytic decomposition, the material is directly discharged with the pollutants, and the recycling efficiency is low

Method used

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  • a tio <sub>2</sub> nanotube composite sio <sub>2</sub> Airgel-based photocatalytic material and preparation method thereof
  • a tio <sub>2</sub> nanotube composite sio <sub>2</sub> Airgel-based photocatalytic material and preparation method thereof
  • a tio <sub>2</sub> nanotube composite sio <sub>2</sub> Airgel-based photocatalytic material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1. Fully mix P25 (nano-scale) from Goodsay Company of Germany with 10mol / L NaOH aqueous solution and then add it to an autoclave with a Teflon liner for stirring. After stirring evenly, seal the autoclave In the oven, the temperature of the oven was slowly raised to 120°C at a rate of 2°C / min and kept for 2 days. After the reaction was completed, the autoclave in the oven was naturally cooled to room temperature to obtain a reaction solution. Among them, the mass ratio of P25 to NaOH in NaOH aqueous solution is 1:12;

[0033] Step 2, centrifuge the reaction solution to get the white precipitate in the lower layer, and use 0.2mol / L hydrochloric acid solution to acidify the white precipitate for 2h under the magnetic stirring condition of 400r / min, and the pH value drops to 6, and then Wash with deionized water twice, centrifuge when the solution is neutral to obtain the lower layer precipitate, and then dry at 80°C to obtain a solid;

[0034] Step 3. Calcining the ...

Embodiment 2

[0040] Step 1. Fully mix titanium dioxide less than 1 micron with 10mol / L NaOH aqueous solution and add it into an autoclave with a polytetrafluoroethylene liner for stirring. After stirring evenly, seal the autoclave and place it in an oven. The temperature of the oven was slowly raised to 120°C at a rate of 2°C / min and kept for 2 days. After the reaction was completed, the autoclave in the oven was naturally cooled to room temperature to obtain a reaction liquid. Among them, the mass ratio of P25 to NaOH in NaOH aqueous solution is 1:12;

[0041] Step 2, centrifuge the reaction solution to get the white precipitate in the lower layer, and use 0.2mol / L hydrochloric acid solution to acidify the white precipitate under the condition of magnetic stirring at 800r / min for 2h, and the pH value drops to 6. Then wash with deionized water twice, centrifuge when the solution is neutral to obtain the lower layer precipitate, and then dry at 80°C to obtain a solid;

[0042] Step 3. Calc...

Embodiment 3

[0053] Step 1. Fully mix P25 from Goodsay Company of Germany with 10mol / L NaOH aqueous solution, then add it into a polytetrafluoroethylene-lined autoclave for stirring. After stirring evenly, seal the autoclave and place it in an oven. The temperature of the oven was slowly raised to 160°C at a rate of 2°C / min, and kept for 2 days. After the reaction was completed, the autoclave in the oven was naturally cooled to room temperature to obtain a reaction liquid. Among them, the mass ratio of P25 to NaOH in NaOH aqueous solution is 1:8;

[0054] Step 2, centrifuge the reaction solution to get the white precipitate in the lower layer, and use 0.2mol / L hydrochloric acid solution to acidify the precipitate for 3h under the condition of magnetic stirring at 500r / min, and the pH value drops to 4, and then Wash with deionized water twice, centrifuge when the solution is neutral to obtain the lower layer precipitate, and then dry at 60°C to obtain a solid;

[0055] Step 3. Calcining th...

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Abstract

A kind of TiO 2 Nanotube Composite SiO 2 Airgel-based photocatalytic material and preparation method thereof, reacting titanium dioxide with NaOH solution to obtain a reaction solution; centrifuging the reaction solution to obtain a white precipitate, adjusting the pH value with acid under stirring, and then washing to neutrality and then centrifuging The lower precipitate was separated, dried and calcined, then mixed with silica sol evenly, and then gelled under stirring conditions to obtain a gel; the gel was aged in absolute ethanol, and then the gel was aged by low-temperature supercritical CO 2 Just dry. The composite photocatalytic material prepared by the present invention has broad application prospects in the fields of photolysis hydrogen production, pollution control, surface antifouling self-cleaning, etc. The prepared TiO 2 Nanotube Composite SiO 2 Airgel-based photocatalytic materials have excellent performance, high photocatalytic activity and yield stability. The preparation method of the invention is simple, the drying efficiency is high, the artificial influence factors are small, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of photocatalytic material synthesis, in particular to a TiO 2 Nanotube Composite SiO 2 Airgel-based photocatalytic material and preparation method thereof. Background technique [0002] With the advancement of science and technology and the development of human society, people's living standards are constantly improving. But at the same time, energy crisis and environmental pollution have become two major problems to be solved in the world. In recent years, people have been looking for ways to control environmental pollution, and many have been found so far, such as high-temperature incineration, physical adsorption, microbial treatment and chemical oxidation. Although these methods have played a role in pollution control to a certain extent, they more or less have some inherent defects and cannot fundamentally remove pollutants. In 1972, Japan's Fujishima and Honda first used TiO 2 Absorbing solar ene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/08
Inventor 李红伟贺佩逯攀岩贾念念王伟
Owner CHANGAN UNIV