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TiO2 nanotube/SiO2 aerogel composite photocatalytic material and preparing method thereof

A technology of photocatalytic materials and nanotubes, applied in chemical instruments and methods, physical/chemical process catalysts, colloid chemistry, etc., can solve the problems of high carrier loading rate of semiconductors, small volume of titanium nanotubes, and low catalytic efficiency , to achieve the effect of photocatalytic activity and photocatalytic utilization rate improvement, excellent adsorption performance and large specific surface area

Inactive Publication Date: 2015-09-02
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, anatase TiO 2 The band gap is 3.2eV, and it can only show catalytic activity when it absorbs ultraviolet light with a wavelength less than 380nm, while ultraviolet light in sunlight only accounts for 3%-5% of the solar spectrum, and the semiconductor carrier loading rate High, low quantum efficiency
The volume of pure titanium nanotubes is too small, and the catalytic efficiency is low when directly dispersed into a solvent. How to improve the TiO 2 The catalytic performance of nanotubes is an urgent problem to be solved

Method used

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  • TiO2 nanotube/SiO2 aerogel composite photocatalytic material and preparing method thereof
  • TiO2 nanotube/SiO2 aerogel composite photocatalytic material and preparing method thereof
  • TiO2 nanotube/SiO2 aerogel composite photocatalytic material and preparing method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] Step 1. Mix titanium dioxide (P25) and 10mol / L NaOH aqueous solution, then add it into an autoclave with a polytetrafluoroethylene liner and stir it evenly, then seal the autoclave and place it in an oven. The temperature was raised from room temperature to 120° C. at a rate of 2° C. / min and kept for 2 days. After the reaction was completed, the autoclave was naturally cooled to room temperature in an oven to obtain a reaction liquid. Wherein, the mass ratio of titanium dioxide to NaOH in NaOH solution is 1:12.

[0035] Step 2: Separating the reaction liquid to obtain a white precipitate, adding 0.2 mol / L hydrochloric acid to the white precipitate to acidify, and magnetically stirring for 2 hours, when the pH value is 6, washing with secondary deionized water until neutral, and then centrifuged to obtain a precipitate, which was dried at 80°C to obtain a solid powder;

[0036] Step 3: Calcining the solid powder at 400°C for 2 hours in an argon atmosphere, and then grin...

Embodiment 2

[0043] Step 1. Mix titanium dioxide (P25) and 10mol / L NaOH aqueous solution, then add it into an autoclave with a polytetrafluoroethylene liner and stir it evenly, then seal the autoclave and place it in an oven. The temperature was raised from room temperature to 120° C. at a rate of 2° C. / min and kept for 2 days. After the reaction was completed, the autoclave was naturally cooled to room temperature in an oven to obtain a reaction liquid. Wherein, the mass ratio of titanium dioxide to NaOH in NaOH solution is 1:12.

[0044] Step 2: Separating the reaction liquid to obtain a white precipitate, adding 0.2 mol / L hydrochloric acid to the white precipitate to acidify, and magnetically stirring for 2 hours, when the pH value is 6, washing with secondary deionized water until neutral, and then centrifuged to obtain a precipitate, which was dried at 80°C to obtain a solid powder;

[0045] Step 3: Calcining the solid powder at 550°C for 2 hours in an argon atmosphere, and then grin...

Embodiment 3

[0057] Step 1. Mix titanium dioxide and 10mol / L NaOH aqueous solution, then add it into an autoclave with a polytetrafluoroethylene liner and stir it evenly, then seal the autoclave and place it in an oven, from room temperature to The temperature was raised to 160° C. at a rate of 2° C. / min and kept for 2 days. After the reaction was completed, the autoclave was naturally cooled to room temperature in an oven to obtain a reaction liquid. Wherein, the mass ratio of titanium dioxide to NaOH in NaOH solution is 1:8.

[0058] Step 2: Separating the reaction liquid to obtain a white precipitate, adding 0.2 mol / L hydrochloric acid to the white precipitate to acidify, and magnetic stirring for 3 hours, when the pH value is 4, wash with deionized water twice to neutrality, and then centrifuged to obtain a precipitate, and dried the precipitate at 60°C to obtain a solid powder;

[0059] Step 3: Calcining the solid powder at 600°C for 2 hours in a nitrogen atmosphere, and then grindin...

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Abstract

Disclosed are TiO2 nanotube / SiO2 aerogel composite photocatalytic material and a preparing method thereof. The preparing method includes: preparing TiO2 nanotubes by means of hydrothermal synthesis, preparing gel by means of a sol-gel method using the TiO2 nanotubes as a discrete phase base and SiO2 aerogel as a continuous phase base, and subjecting the gel to ageing and modifying to obtain the material. By the use of the hydrothermal method with the sol-gel method, the material prepared has the shape of the titanium nanotubes well retained; the equipment for use is simple and is safe to operate; the material is of a porous structure, and the excellent surface physical-chemical characteristics of the porous structure help partly improve the catalytic activity of the material; by using the SiO2 aerogel as a carrier, the loading problem of nano-catalyst is solved; the material is easy to recover, reusable, environment friendly and high in performance.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation, in particular to a TiO 2 Nanotube / SiO 2 Airgel composite photocatalytic material and preparation method thereof. Background technique [0002] In the 21st century, with the rapid development of petroleum, chemical and pharmaceutical industries, the advancement of science and technology and the improvement of human living standards, water pollution and air pollution are seriously threatening human health and life. It has increasingly become a common issue in all countries in the world. Especially in developing countries, environmental pollution is becoming more and more serious. As an emerging environmental remediation technology, adsorption / photocatalytic materials, as green and environmentally friendly degradation materials, have become a hot spot in the research fields of materials science and catalysis. For example, M. Hamle discloses a photocatalytic composition comprising photocat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/08B01J13/00
Inventor 李红伟贾念念逯攀岩贺佩王伟桑可正
Owner CHANGAN UNIV
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