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Magnetic Fe3O4/SiO2/TiO2/quantum dot compounded nanometer photocatalyst and preparation method and application thereof

A nano-photocatalyst, photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of narrow spectral response range, restricting large-scale commercial application, and difficult to recycle.

Inactive Publication Date: 2013-02-13
HUBEI UNIV
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Problems solved by technology

with TiO 2 and modified TiO 2 The representative photocatalytic materials have problems such as low utilization rate of solar energy and light conversion efficiency, poor stability, narrow spectral response range, and difficult recycling, which restricts its large-scale commercial application.

Method used

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  • Magnetic Fe3O4/SiO2/TiO2/quantum dot compounded nanometer photocatalyst and preparation method and application thereof
  • Magnetic Fe3O4/SiO2/TiO2/quantum dot compounded nanometer photocatalyst and preparation method and application thereof

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Such as figure 1 As shown, this embodiment provides a magnetic Fe 3 o 4 / SiO 2 / TiO 2 / Quantum dot composite nano photocatalyst, the photocatalyst uses Fe 3 o 4 The nanoparticles are the magnetic core, and the surface of the magnetic core is coated with SiO 2 Protective layer, then composite TiO 2 Photocatalytic materials, finally modified with CdS, CdSe quantum dots.

[0025] The present embodiment also provides a kind of above-mentioned magnetic Fe 3 o 4 / SiO 2 / TiO 2 / The preparation method of quantum dot composite nanometer photocatalyst, this photocatalyst adopts co-precipitation method to synthesize Fe 3 o 4 Magnetic core, prepared SiO by hydrolysis and polycondensation of tetraethylorthosilicate (TEOS) 2 protective layer, and then composite TiO by sol-gel method 2 layer, namely Fe 3 o 4 / SiO 2 / TiO 2 Magnetic nanopar...

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Abstract

The invention belongs to the technical field of treatment and application of nanometer materials and industrial and agricultural wastewater, and provides a magnetic Fe3O4 / SiO2 / TiO2 / quantum dot compounded nanometer photocatalyst and a preparation method and application thereof. The preparation method comprises the following steps of: synthesizing an Fe3O4 magnetic nucleus by a coprecipitation method; preparing an SiO2 protective layer by virtue of hydrolysis reaction and polycondensation reaction of TEOS (Tetraethyl Orthosilicate); then preparing a TiO2 layer on the surface of the SiO2 protective layer by a sol-gel method; and finally modifying Fe3O4 / SiO2 / TiO2 nanoparticles by CdS and CdSe quantum dots. The obtained magnetic Fe3O4 / SiO2 / TiO2 / quantum dot compounded nanometer photocatalyst has very good visible-light photocatalytic capability, can be conveniently and fast recovered and reused by an external magnetic field, and can be used for removing organic pollutants of azo dyes contained in the industrial wastewater.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and industrial and agricultural wastewater treatment applications, in particular to a magnetic Fe 3 o 4 / SiO 2 / TiO 2 / Quantum dot composite nano photocatalyst and its preparation method and application. Background technique [0002] With the development of economy and the expansion of population, the refractory organic pollutants in water have increased sharply, and the already limited water resources of human beings have been seriously polluted, which has developed to the point of threatening human survival. The treatment of these pollutants and the effective control and governance of environmental pollution have become major problems that countries all over the world are facing and need to solve urgently. Photocatalytic materials have two major functions of photo-splitting water to produce hydrogen and photodegrading organic pollutants. Photocatalytic materials can not only convert l...

Claims

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Application Information

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IPC IPC(8): B01J27/04B01J27/057C02F1/30
CPCY02W10/37
Inventor 倪红祁亚军董明李秀李春霞
Owner HUBEI UNIV
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