Photocatalytic composite particle as well as preparation method and application thereof

A composite particle and photocatalysis technology, applied in the field of photocatalysis, can solve the problems of ineffective removal of polycyclic aromatic hydrocarbons, difficulty in material recycling and low treatment efficiency, etc., and achieve high degradation efficiency and photon utilization efficiency, excellent Chemical and thermal stability, small reaction area effect

Active Publication Date: 2021-04-06
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, conventional treatment processes in sewage treatment plants cannot effectively remove refractory organics such as polycyclic aromatic hydrocarbons and polychlorinated b

Method used

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  • Photocatalytic composite particle as well as preparation method and application thereof
  • Photocatalytic composite particle as well as preparation method and application thereof
  • Photocatalytic composite particle as well as preparation method and application thereof

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preparation example Construction

[0115] The preparation process of the photocatalytic film of the present invention is as follows figure 1 As shown, it specifically includes: using strontium titanate single crystal particles, electron donor salt and electron acceptor salt to carry out ultraviolet light-induced deposition reaction to prepare photocatalytic composite particles, and the photocatalytic composite particles, matrix and two-dimensional layered material The layer-by-layer self-assembly reaction was induced by ultraviolet light, and the photocatalytic film was prepared.

[0116] The invention provides a kind of photocatalytic composite particle, and described photocatalytic composite particle comprises the strontium titanate single crystal particle of octadecahedron, icosahedron or regular hexahedron and electron donor and electron donor supported on the surface of strontium titanate single crystal particle Electron acceptor; the molar ratio of strontium titanate single crystal particles, electron don...

Embodiment 1

[0128] This embodiment provides a photocatalytic composite particle, which includes octahedral strontium titanate single crystal particles, such as figure 2 As shown, and chromium oxide and manganese oxide supported on the surface of strontium titanate single crystal particles; the molar ratio of strontium titanate single crystal particles, chromium oxide and manganese oxide in the photocatalytic composite particles is 250:1:1.5.

[0129] This embodiment provides a preparation method of the photocatalytic composite particles, the preparation method comprising the following steps:

[0130] (1) Mix the octahedral strontium titanate single crystal particle dispersion liquid with a concentration of 0.25wt% and the potassium chromate solution of 0.005mol / L under 250W ultraviolet light irradiation, the stirring speed is 450r / min, and the stirring time is 70min, the intermediate product was obtained, the intermediate product was mixed with the manganese nitrate solution of 0.0075mol...

Embodiment 2

[0133] This embodiment provides a kind of photocatalytic composite particle, and described photocatalytic composite particle comprises the strontium titanate single crystal particle of icosahedron, such as image 3 As shown, and platinum and manganese oxide supported on the surface of strontium titanate single crystal particles; the molar ratio of strontium titanate single crystal particles, platinum and manganese oxide in the photocatalytic composite particles is 25:1:1.

[0134] This embodiment provides a preparation method of the photocatalytic composite particles, the preparation method comprising the following steps:

[0135] (1) Mix the icosahedral strontium titanate single crystal particle dispersion liquid with a concentration of 0.1wt% and 0.002mol / L chloroplatinic acid solution under 200W ultraviolet light irradiation, the stirring speed is 600r / min, and the stirring time The intermediate product was obtained for 20 min, and the intermediate product was mixed with 0....

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Abstract

The invention provides a photocatalytic composite particle as well as a preparation method and application thereof, the photocatalytic composite particle comprises strontium titanate, and an electron donor and an electron acceptor which are loaded on the surface of strontium titanate, and the photocatalytic composite particle is prepared by adopting an ultraviolet light induced deposition method. The invention further provides a photocatalytic membrane, the photocatalytic membrane comprises a substrate and a composite layer arranged on the surface of the substrate, the composite layer sequentially comprises a bottom layer and a repeating layer from the substrate, and the repeating layer comprises the photocatalytic composite particle layer. According to the invention, self-assembly layer by layer can be induced by UV, the photocatalytic membrane in which the number of prepared layers can be controlled and photocatalytic composite particles are uniformly arranged is prepared, the preparation method is simple, and the photocatalytic degradation efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a photocatalytic composite particle and its preparation method and application. Background technique [0002] At present, conventional treatment processes in sewage treatment plants cannot effectively remove refractory organics such as polycyclic aromatic hydrocarbons and polychlorinated biphenyls. The outstanding problems of the filter process and other treatment processes are low treatment efficiency, complex process, and difficulty in material recovery and reuse. In recent years, photocatalytic degradation technology has become one of the ways to degrade organic matter because of its environmental protection and high efficiency. [0003] Photocatalytic degradation technology uses solar energy to directly degrade organic matter into water and carbon dioxide. It has the advantages of excellent degradation effect and low material maintenance cost, which is in line with th...

Claims

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Application Information

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IPC IPC(8): B01J23/02B01J23/34B01J23/656B01J23/89B01J31/38B01J35/00B01J37/02B01J37/34C02F1/30C02F101/30
CPCB01J35/004B01J37/345B01J23/02B01J23/34B01J23/6562B01J23/8946B01J23/8986B01J31/38B01J37/024C02F1/30C02F2305/10C02F2101/30
Inventor 段东平贾奇博钟莉陈思明任玉枝
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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