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Three dimensional ordered meso-porous Au-TiO2/IO-SiO2 film visible light photocatalyst and preparation method thereof

A photocatalyst, au-tio2 technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc. Catalytic performance, enhancement of absorption rate, effect of reducing recombination rate

Inactive Publication Date: 2016-06-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although TiO 2 Has many advantages, but TiO 2 also has its own limitations
Widely used TiO 2 As anatase, its bandgap width is 3.2ev, and it can only use less than 5% of the ultraviolet light in sunlight, which makes TiO2 very low in efficiency of solar energy utilization.

Method used

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  • Three dimensional ordered meso-porous Au-TiO2/IO-SiO2 film visible light photocatalyst and preparation method thereof
  • Three dimensional ordered meso-porous Au-TiO2/IO-SiO2 film visible light photocatalyst and preparation method thereof
  • Three dimensional ordered meso-porous Au-TiO2/IO-SiO2 film visible light photocatalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] Three-dimensional ordered mesoporous Au-TiO 2 / IO-SiO 2 The preparation method of catalyst, step is as follows:

[0028](1) Synthesize monodisperse polystyrene microspheres (PS) by soap-free emulsion polymerization: 137ml of absolute ethanol and 53ml of deionized water are added in a four-necked flask, and argon is introduced into the device as a protective gas, and the stirring rate is The temperature is 300rmp / min, and the temperature of the oil bath is raised slowly. When the temperature in the device was stabilized at 71° C., 10 ml of styrene after vacuum distillation was added, and then 0.18 g of potassium persulfate dissolved in 10 ml of deionized water was added as an initiator. After 24 hours of reaction, stop heating, and after cooling, remove impurities and large particles by suction filtration with a glass fiber membrane to obtain a polystyrene suspension with uniform particle size, the particle size is about 370nm.

[0029] (2) Preparation of SiO by co-as...

Embodiment 2

[0034] Three-dimensional ordered mesoporous Au-TiO 2 / IO-SiO 2 The preparation method of catalyst, step is with embodiment 1, difference is: used HAuCl 4 4H 2 The mass of O is 0.0067g, and the degradation rate of tetracycline hydrochloride reaches 85.4% after visible light irradiation for 2 hours. 0.0134g, the degradation rate of tetracycline hydrochloride reached 79.4% after visible light irradiation for 2 hours.

Embodiment 3

[0036] Three-dimensional ordered mesoporous Au-TiO 2 / IO-SiO 2 The preparation method of catalyst, step is with embodiment 1, difference is: used HAuCl 4 4H 2 The mass of O is 0.01g, and the degradation rate of tetracycline hydrochloride reaches 92% after visible light irradiation for 2 hours.

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Abstract

The invention relates to a three dimensional ordered meso-porous Au-TiO2 / IO-SiO2 film visible light photocatalyst and a preparation method thereof, and belongs to the field of titanium dioxide photocatalysis. The method comprises the following steps: preparing polystyrene microspheres with different particle sizes through a soap-free emulsion polymerization technology, and synthesizing a high quality silica inverse opal film template with different apertures through a polystyrene microsphere and silica precursor liquid co-assembling technology with the polystyrene microspheres as a template; and depositing Au nanoparticles in a titanium dioxide precursor liquid through a chemical reduction technology by using NaBH4 as a reducing agent, and injecting the Au nanoparticles to the silica inverse opal template in order to finally make a precious metal deposited three dimensional ordered meso-porous Au-TiO2 / IO-SiO2 film. The special structure of photonic crystals can enhance the light absorption; and the Fermi level of deposited Au is lower than that of titanium dioxide, so electron-cavity separation is facilitated, thereby increase of the photocatalysis efficiency is facilitated.

Description

technical field [0001] The invention relates to three-dimensional ordered mesoporous Au-TiO2 / IO-SiO 2 Visible light photocatalyst preparation and its application field. The catalyst prepared by the method is particularly suitable for degrading organic dyes (such as tetracycline hydrochloride) under visible light irradiation, and has a good catalytic degradation effect. Background technique [0002] With the development of the global economy and the acceleration of industrialization, the demand for human energy has also increased significantly. Although many achievements have been made in development, the excessive exploitation and utilization of energy has destroyed the balance of nature and led to an energy crisis. On the other hand, the waste water and gas pollution brought about by industrialization has overwhelmed the earth, and environmental problems have become the most important issues that people on earth should care about and urgently need to solve. Therefore, as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52
CPCB01J23/52B01J37/036B01J37/16B01J35/39
Inventor 徐联宾熊瑛瑛陈建峰柴文霞
Owner BEIJING UNIV OF CHEM TECH
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