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Preparation method of polymer/titanium dioxide hybrid membrane with photocatalytic activity

A technology of photocatalytic activity and titanium dioxide, which is applied in the preparation of polymer/titanium dioxide hybrid film, polymer/titanium dioxide hybrid film products, and photodegradation of organic pollutants in water, which can solve the problem of weak loading force and reduced photocatalytic activity and other problems, to achieve the effect of good loading, high photocatalytic activity and mild reaction conditions

Active Publication Date: 2012-07-04
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the weak force of these loads, the loss of titanium dioxide nanoparticles cannot be avoided during long-term cycle use, resulting in a decrease in photocatalytic activity and limiting the industrialization of photocatalysts in the field of water treatment.

Method used

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  • Preparation method of polymer/titanium dioxide hybrid membrane with photocatalytic activity
  • Preparation method of polymer/titanium dioxide hybrid membrane with photocatalytic activity
  • Preparation method of polymer/titanium dioxide hybrid membrane with photocatalytic activity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of polymer / titanium dioxide hybrid membrane: Add 0.5 g of titanium dioxide nanoparticles with a primary particle size of 20 nm produced by the gas-phase method into 45 mL of deionized water, ultrasonicate for 2 hours and mechanically stir for 1 hour to form a uniformly dispersed titanium dioxide dispersion . Add 5g of polyvinyl alcohol (PVA) into the three-necked flask containing the above-mentioned titanium dioxide dispersion, mechanically stir in an oil bath at 100°C for 1 hour to fully dissolve the PVA, then continue to stir in an oil bath at 60°C for 3 hours, Mix PVA and titanium dioxide nanoparticles evenly. Pour the mixed solution on the substrate, spread the film and control the thickness of the wet film to 1 mm, and naturally volatilize the deionized water to obtain the base film of the hybrid film with a thickness of about 0.06 mm.

[0045] The base film of the obtained hybrid film is not subjected to any heat treatment, and the primary particle di...

Embodiment 2

[0048] Preparation of polymer / titanium dioxide hybrid membrane: Add 0.5 g of titanium dioxide nanoparticles with a primary particle size of 20 nm produced by the gas-phase method into 45 mL of deionized water, ultrasonicate for 2 hours and mechanically stir for 1 hour to form a uniformly dispersed titanium dioxide dispersion . Add 5g of polyvinyl alcohol (PVA) into the three-necked flask containing the above-mentioned titanium dioxide dispersion, mechanically stir in an oil bath at 100°C for 1 hour to fully dissolve the PVA, then continue to stir in an oil bath at 60°C for 3 hours, Mix PVA and titanium dioxide nanoparticles evenly. Pour the mixed solution on the substrate, spread the film and control the thickness of the wet film to 1 mm, and naturally volatilize the deionized water to obtain the base film of the hybrid film with a thickness of about 0.06 mm.

[0049] Put the base film of the above-mentioned hybrid film into a vacuum oven at 140°C, and heat-treat it in vacuum...

Embodiment 3

[0052] Preparation of polymer / titanium dioxide hybrid membrane: Add 0.5 g of titanium dioxide nanoparticles with a primary particle size of 20 nm produced by the gas-phase method into 45 mL of deionized water, ultrasonicate for 2 hours and mechanically stir for 1 hour to form a uniformly dispersed titanium dioxide dispersion . Add 5g of polyvinyl alcohol (PVA) into the three-necked flask containing the above-mentioned titanium dioxide dispersion, mechanically stir in an oil bath at 100°C for 1 hour to fully dissolve the PVA, then continue to stir in an oil bath at 60°C for 3 hours, Mix PVA and titanium dioxide nanoparticles evenly. Pour the mixed solution on the substrate, spread the film and control the thickness of the wet film to 1 mm, and naturally volatilize the deionized water to obtain the base film of the hybrid film with a thickness of about 0.06 mm.

[0053] Put the base film of the above hybrid film in a vacuum drying oven at 140°C and heat-treat it in vacuum for 1...

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Abstract

The invention belongs to the field of loading of a titanium dioxide photocatalyst, and particularly relates to a preparation method of a polymer / titanium dioxide hybrid membrane with photocatalytic activity, a product prepared with the method and an application thereof. The method disclosed by the invention comprises the following steps of: preparing a base membrane of the polymer / titanium dioxide hybrid membrane; and chemically loading titanium dioxide nanoparticles onto a polymer substrate with a thermal treatment method. Due to the adoption of the preparation method of the polymer / titanium dioxide hybrid membrane with photocatalytic activity provided by the invention, titanium dioxide nanoparticles can be grafted onto a polymer molecular chain. Compared with the prior art, the method has the advantages that: chemical loading of the titanium dioxide nanoparticles in the polymer membrane is realized, the problem of loss of the titanium dioxide nanoparticles in a long-term use process which is difficult to solve in the conventional loading method is solved, high photocatalytic activity in the long-term use process is ensured, a process is simple, and reaction conditions are mild.

Description

technical field [0001] The invention belongs to the field of titanium dioxide photocatalysts, in particular to a method for preparing a polymer / titanium dioxide hybrid film with photocatalytic activity, a polymer / titanium dioxide hybrid film product with photocatalytic activity obtained by the method, and the product It is used for photodegradation of organic pollutants in water. Background technique [0002] With the continuous development of society, the discharge of domestic sewage and production sewage is increasing day by day, and the environmental pollution is becoming more and more serious. How to protect water resources and protect the environment has become a hot spot of concern all over the world. Since Carey [Environ.Contam.Toxicol.16 (1976) 697] reported the photocatalytic removal of toxic pollutants in sewage by titanium dioxide in 1976, titanium dioxide photocatalysts have been used in various aspects of water treatment. Semiconductor titanium dioxide photocat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38A62D3/10A62D101/28
Inventor 阳明书雷萍王峰张世民丁艳芬
Owner INST OF CHEM CHINESE ACAD OF SCI
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