Method for preparing TiO2/PS/Fe3O4 magnetic nanoparticle photocatalyst

A technology of magnetic nanoparticles and photocatalysts, applied in the direction of organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of not completely preventing the diffusion of magnetic nuclear substances and reducing saturation Magnetic susceptibility, reducing photocatalytic activity and other issues, to achieve high recycling rate, overcome high energy consumption, and reduce actual operating costs

Inactive Publication Date: 2012-07-18
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, heat treatment has many disadvantages: first, heat treatment can lead to the oxidation of magnetic materials, reduce the saturation magnetic susceptibility, and reduce the recovery performance; second, heat treatment will make TiO 2 The specific surface area is reduced and the surface hydroxyl groups are lost, thereby reducing the photocatalytic activity; finally, when heat-treated, the thinner porous SiO 2 The inert spacer layer cannot completely prevent the magnetic core material from moving to TiO 2 diffusion, thereby reducing the TiO 2 photocatalytic activity; and the inert isolation layer is too thick, it will shield the magnetism of ferrite and reduce the recovery performance

Method used

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  • Method for preparing TiO2/PS/Fe3O4 magnetic nanoparticle photocatalyst
  • Method for preparing TiO2/PS/Fe3O4 magnetic nanoparticle photocatalyst
  • Method for preparing TiO2/PS/Fe3O4 magnetic nanoparticle photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1 Preparation of TiO 2 / PS / Fe 3 O 4 The method for magnetic nanoparticle photocatalyst, comprises the following steps:

[0042] (1) Oleic acid modified Fe 3 O 4 Preparation of nanoparticles:

[0043] in N 2 Under protection, the FeCl 3 ·6H 2 O and FeCl 2 4H 2 O was dissolved in deionized water, stirred evenly at 25°C, and NH 3 ·H 2 O, and oleic acid was added to the reaction system, and the reaction was completed to obtain a suspended product. Among them: FeCl 3 ·6H 2 The mass ratio of O to deionized water is 2:100, FeCl 2 4H 2 The mass ratio of O to deionized water is 3:100, NH 3 ·H 2 The volume ratio of O to deionized water is 3:6, and the mass ratio of oleic acid to deionized water is 1:150.

[0044] Heat the suspended product to 60°C and keep it for 25 minutes, then raise the reaction temperature to 90°C, evaporate water and excess ammonia water, and obtain a black precipitate; the black precipitate is filtered with suction, cooled to room ...

Embodiment 2

[0057] Example 2 Preparation of TiO 2 / PS / Fe 3 o 4 The method for magnetic nanoparticle photocatalyst, comprises the following steps:

[0058] (1) Oleic acid modified Fe 3 o 4 Preparation of nanoparticles:

[0059] in N 2 Under protection, the FeCl 3 ·6H 2 O and FeCl 2 4H 2 O was dissolved in deionized water, stirred evenly at 30°C, and NH 3 ·H 2 O, and oleic acid was added to the reaction system, and the reaction was completed to obtain a suspended product. Among them: FeCl 3 ·6H 2 The mass ratio of O to deionized water is 3:200, FeCl 2 4H 2 The mass ratio of O to deionized water is 4:200, NH 3 ·H 2 The volume ratio of O to deionized water is 4:8, and the mass ratio of oleic acid to deionized water is 1:300.

[0060] Heat the suspended product to 80°C and keep it for 35 minutes, then raise the reaction temperature to 95°C, evaporate water and excess ammonia water, and obtain a black precipitate; the black precipitate is filtered with suction, cooled to room ...

Embodiment 3

[0073] Example 3 Preparation of TiO 2 / PS / Fe 3 o 4 The method for magnetic nanoparticle photocatalyst, comprises the following steps:

[0074] (1) Oleic acid modified Fe 3 o 4 Preparation of nanoparticles:

[0075] in N 2 Under protection, the FeCl 3 ·6H 2 O and FeCl 2 4H 2 Dissolve O in deionized water, stir well at 28°C, add NH 3 ·H 2 O, and oleic acid was added to the reaction system, and the reaction was completed to obtain a suspended product. Among them: FeCl 3 ·6H 2 The mass ratio of O to deionized water is 2.5:150, FeCl 2 4H 2 The mass ratio of O to deionized water is 3.5:150, NH 3 ·H 2 The volume ratio of O to deionized water is 3.5:7, and the mass ratio of oleic acid to deionized water is 1:200.

[0076] Heat the suspended product to 70°C and keep it for 30 minutes, then raise the reaction temperature to 93°C, evaporate water and excess ammonia water, and obtain a black precipitate; the black precipitate is filtered with suction, cooled to room temp...

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Abstract

The invention relates to a method for preparing a TiO2 / PS / Fe3O4 magnetic nanoparticle photocatalyst, comprising the following steps of: (1) preparing oleic acid modified Fe3O4 nanoparticles; (2) preparing an aqueous-phase magnetic fluid; (3) preparing styrene miniemulsion; (4) preparing magnetic polystyrene beads PS / Fe3O; and (5) preparing the magnetic photocatalyst TiO2 / PS / Fe3O4, which specifically comprises the following steps of: mixing absolute ethyl alcohol with tetra-n-butyl titanate, and performing magnetic stirring to form a solution A; adding the magnetic polystyrene beads PS / Fe3O to de-ionized water and performing ultrasonic treatment to form a solution B; under magnetic stirring, adding the solution A to the solution B, thereby obtaining sol after 30-40 min, wherein TiO2 covers the PS / Fe3O at the moment; after condensing and refluxing the sol in a water bath, filtering the sol to obtain the TiO2 / PS / Fe3O4, washing the TiO2 / PS / Fe3O4 by using ethanol, filtering, washing by using distilled water and filtering, thus obtaining a solid; and drying the solid until the weight thereof is constant, thereby obtaining the magnetic photocatalyst TiO2 / PS / Fe3O4 with the polystyrene PS as an isolating layer, the Fe3O4 as a magnetic core and the TiO2 as a shell. The product obtained by using the method is low in energy consumption, high in catalytic activity and recyclable.

Description

technical field [0001] The invention relates to the technical field of photocatalysts, in particular to the preparation of TiO 2 / PS / Fe 3 O 4 Methods of Magnetic Nanoparticle Photocatalysts. Background technique [0002] Nano TiO 2 Due to its advantages of non-toxic, harmless, non-corrosive, high catalytic activity, strong oxidizing ability and no secondary pollution, it has attracted extensive attention of many scholars at home and abroad in the field of organic wastewater and air purification. As powdered TiO 2 There are disadvantages such as difficult separation, easy agglomeration, and inability to reuse. 2 Supported on the surface of bulk materials (glass, ceramics, metals, etc.) and powder materials (glass beads, activated carbon, bentonite, etc.). The loading in the bulk material resolves the TiO 2 The problem of recycling is difficult, but the problem of reducing the catalytic efficiency occurs; and the problem of difficult recycling still exists in the loadin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38C02F1/30C02F101/34
Inventor 任学昌王静王雪姣念娟妮肖举强王刚常青
Owner LANZHOU JIAOTONG UNIV
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