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

A photocatalytic material and nanotube technology, applied in chemical instruments and methods, physical/chemical process catalysts, colloidal chemistry, etc., can solve the problems of high semiconductor carrier load rate, small size of titanium nanotubes, low catalytic efficiency, etc. , to achieve the effects of improved photocatalytic activity and photocatalytic utilization, excellent adsorption performance, and large specific surface area

Inactive Publication Date: 2017-05-31
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, anatase TiO 2 The forbidden band width 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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  • a tio <sub>2</sub> nanotube/sio <sub>2</sub> Airgel composite photocatalytic material and preparation method thereof
  • a tio <sub>2</sub> nanotube/sio <sub>2</sub> Airgel composite photocatalytic material and preparation method thereof
  • a tio <sub>2</sub> nanotube/sio <sub>2</sub> Airgel composite photocatalytic material and preparation 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 solution. 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 gr...

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 solution. 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 gr...

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

A kind of TiO 2 Nanotube / SiO 2 Airgel composite photocatalytic material and preparation method thereof, the present invention first hydrothermally synthesizes TiO 2 nanotubes, followed by TiO 2 Nanotubes as discrete phase, SiO 2 The airgel is a continuous phase matrix, and the gel is prepared by the sol-gel method, and then the gel is aged, aged and modified to synthesize the photocatalytic material. Due to the combination of the hydrothermal method and the sol-gel method, the photocatalytic powder material prepared by the invention better maintains the appearance of the titanium nanotube, and the equipment adopted is simple and the operation is safe. The present invention prepares TiO 2 Nanotube / SiO 2 The airgel composite photocatalytic powder material has a porous structure, which can improve its catalytic activity to a certain extent by utilizing the excellent surface physical and chemical properties of the pore structure; at the same time, the SiO 2 Airgel is used as a carrier, which solves the loading problem of nano-catalysts, is easy to recover, and can be recycled, which is an environmentally friendly high-performance material.

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 Patents(China)
IPC IPC(8): B01J21/08B01J13/00
Inventor 李红伟贺佩贾念念逯攀岩王伟桑可正
Owner CHANGAN UNIV
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