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TiO2-SiO2 visible-light-driven photocatalytic composite film and preparation method thereof

A composite thin film and photocatalytic technology, which is applied in the field of photocatalytic chemistry and nanomaterial science, can solve problems such as limited applications, and achieve the effects of saving cost and time, simple preparation process, and easy recycling

Active Publication Date: 2017-02-01
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The Chinese invention patent document with the publication number CN102718411A discloses a natural superhydrophilic porous TiO 2 / SiO 2 Composite film and its preparation method, the prepared film also needs to be calcined and cooled to obtain the final film, which limits its application on flexible substrates with poor heat resistance

Method used

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  • TiO2-SiO2 visible-light-driven photocatalytic composite film and preparation method thereof
  • TiO2-SiO2 visible-light-driven photocatalytic composite film and preparation method thereof
  • TiO2-SiO2 visible-light-driven photocatalytic composite film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0058] (1) Mix TEOS and ethanol at a molar ratio of 1:5, add ammonium chloride aqueous solution, add hydrochloric acid to adjust the pH of the solution to 2, and stir at room temperature for 30 minutes to obtain solution A. Wherein, the molar ratio of TEOS, ammonium chloride and water is 300:0.16:12;

[0059] (2) Mix TBOT and ethanol at a molar ratio of 1:20, stir at room temperature for 30 minutes, and obtain solution B;

[0060] (3) Add solution B dropwise to solution A, add ferric nitrate to obtain solution C, react at a temperature of 55° C. for 1 hour, and obtain a transparent sol. Wherein, the molar ratio of TEOS and TBOT is 3:1, and the molar ratio of TBOT and ferric nitrate is 100:0.1;

[0061] (4) Add polyethylene glycol (PEG600) to the transparent sol, the dosage of PEG600 is the sum of the mass of TEOS and TBOT in the sol, stir vigorously at room temperature for 12 hours, and obtain the coating sol;

[0062] (5) Statically pull and form a film on a PET substrate. ...

Embodiment 2

[0066] (1) Mix TEOS and ethanol at a molar ratio of 1:5, add ammonium nitrate aqueous solution, add hydrochloric acid to adjust the pH of the solution to 2, and stir at room temperature for 30 minutes to obtain solution A. Wherein, the molar ratio of TEOS, ammonium nitrate and water is 300:0.16:12;

[0067] (2) Mix TBOT and ethanol at a molar ratio of 1:20, stir at room temperature for 30 minutes, and obtain solution B;

[0068] (3) Add solution B dropwise to solution A, add ferric chloride to obtain solution C, react at 55° C. for 1 hour, and obtain a transparent sol. Wherein, the molar ratio of TEOS and TBOT is 3:1, and the molar ratio of TBOT and ferric chloride is 100:0.05;

[0069] (4) Add polyethylene glycol (PEG600) to the transparent sol, the dosage of PEG600 is the sum of the mass of TEOS and TBOT in the sol, stir vigorously at room temperature for 12 hours, and obtain the coating sol;

[0070] (5) Statically pull and form a film on a glass substrate, dry the obtain...

Embodiment 3

[0074] (1) Mix TEOS and methanol at a molar ratio of 1:10, add ammonium sulfate aqueous solution, add hydrochloric acid to adjust the pH of the solution to 2.5, and stir at room temperature for 60 minutes to obtain solution A. Wherein, the molar ratio of TEOS, ammonium sulfate, and water is 500:0.1:20;

[0075] (2) Mix TBOT and methanol at a molar ratio of 1:25, and stir at room temperature for 60 minutes to obtain solution B;

[0076] (3) Add solution B dropwise to solution A, add ferric chloride to obtain solution C, and react at 70° C. for 30 minutes to obtain a transparent sol. Wherein, the molar ratio of TEOS and TBOT is 5:1, and the molar ratio of TBOT and ferric chloride is 100:0.01;

[0077] (4) Add polyethylene glycol (PEG600) to the transparent sol, the dosage of PEG600 is 0.8 times of the sum of the mass of TEOS and TBOT in the sol, stir vigorously at room temperature for 1 hour, and obtain the coating sol;

[0078] (5) Statically pull and form a film on a glass s...

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Abstract

The invention discloses a TiO2-SiO2 visible-light-driven photocatalytic composite film and a preparation method thereof. The preparation method is characterized by comprising the following concrete steps: (1) dissolving ethyl orthosilicate in alcohol, adding an aqueous solution containing an ammonium salt, adding hydrochloric acid to adjust the pH value of the obtained solution to 1 to 3 and carrying out stirring at room temperature so as to obtain a solution A; (2) mixing tetrabutyl titanate with alcohol and carrying out stirring at room temperature so as to obtain a solution B; (3) adding the solution B into the solution A drop by drop, adding a ferric salt so as to obtain a solution C and carrying out reaction at 10 to 90 DEG C so as to obtain a transparent sol; (4) adding polyethylene glycol into the transparent sol and carrying out stirring at room temperature so as to obtain a film coating sol; and (5) allowing the film coating sol to form a film on a substrate, drying the obtained film, immediately transferring the film to water with a temperature of 55 to 100 DEG C for a reaction, and taking out the film for drying after the reaction so as to obtain the TiO2-SiO2 visible-light-driven photocatalytic composite film. The invention also discloses the TiO2-SiO2 visible-light-driven photocatalytic composite film prepared by using the method. According to the invention, crystallization of titanium dioxide and iron and nitrogen doping of TiO2-SiO2 are realized at low temperature.

Description

technical field [0001] The invention belongs to the fields of nanomaterial science and photocatalytic chemistry, and specifically relates to a TiO 2 -SiO 2 Visible light photocatalytic composite thin film and preparation method thereof. Background technique [0002] With the development of society and the continuous improvement of people's living standards, environmental and energy issues have become hot issues that human beings need to solve urgently. In recent years, semiconductor photocatalysis has been applied in many fields due to its potential advantages, such as environmental remediation, water and air purification, and hydrogen production. TiO 2 Semiconductor photocatalytic oxidation technology has become a research hotspot for scientific researchers because of its outstanding advantages such as high photocatalytic efficiency, low energy consumption, easy operation, mild reaction conditions, wide application range, good stability, and no secondary pollution. Semi...

Claims

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Application Information

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IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/40B01J35/00B01J35/30B01J35/39
Inventor 诸葛飞卜彦强吴明番曹鸿涛吴爱国徐裕
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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