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Preparing method for SiC/TiO2 composite photocatalytic nano-particles

A technology of composite photocatalysis and nanoparticles, which is applied in the field of preparation of SiC/TiO2 composite photocatalysis nanoparticles, which can solve the problems of low photocatalysis efficiency of titanium dioxide, achieve broadened photoresponse range, controllable growth process, and simple preparation method Effect

Inactive Publication Date: 2019-01-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a SiC / TiO 2 Preparation method of composite photocatalytic nanoparticles

Method used

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  • Preparing method for SiC/TiO2 composite photocatalytic nano-particles
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  • Preparing method for SiC/TiO2 composite photocatalytic nano-particles

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specific Embodiment approach 1

[0026] Specific implementation mode 1: SiC / TiO in this implementation mode 2 The preparation method of composite photocatalytic nanoparticles is implemented according to the following steps:

[0027] 1. Preparation of precursor solution: Add nano-silicon carbide powder into absolute ethanol, and disperse evenly by ultrasonic to obtain a nano-silicon carbide suspension. Add tetra-n-butyl titanate (slowly) to the nano-silicon carbide suspension, and fully Pour into deionized water after dissolving, and obtain the precursor solution after magnetic stirring;

[0028] 2. Hydrothermal preparation of composite particles: put the precursor solution into a reaction kettle lined with polytetrafluoroethylene, and react at 140-180°C for 5-6 hours after filling the kettle, and open the kettle after cooling to obtain a reaction solution ;

[0029] 3. Washing and grinding: collect the precipitated solid phase in the lower layer of the reaction solution, wash the solid phase with ethanol fo...

specific Embodiment approach 2

[0031] Embodiment 2: This embodiment differs from Embodiment 1 in that the average particle size of the nano-silicon carbide powder in Step 1 is 30-50 nanometers.

specific Embodiment approach 3

[0032] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the magnetic stirring time in Step 1 is 15-30 minutes.

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Abstract

The invention discloses a preparing method for SiC / TiO2 composite photocatalytic nano-particles, and belongs to the field of photocatalytic material preparation. The problem that the photocatalytic efficiency of titanium dioxide is low is solved. The preparing method includes the steps that 1, nanometer silicon carbide powder is added into absolute ethyl alcohol, ultrasonic dispersion is carried out until the mixture is uniform, nanometer-silicon-carbide suspension liquid is obtained, then tetra-n-butyl titanate is added, the mixture is fully dissolved to be poured into deionized water, and aprecursor solution is obtained after magnetic stirring; 2, the precursor solution is put into a reaction kettle with a polytetrafluoroethylene lining, the mixture is reacted at the temperature of 140DEG C to 180 DEG C, and reaction liquid is obtained; 3, precipitated solid phase of the lower layer of the reaction liquid is collected, and is washed and dried to be ground into powder, and the SiC / TiO2 composite photocatalytic nano-particles are obtained. The preparing method is simple, and in the SiC / TiO2 composite photocatalytic nano-particles prepared with the method, through heterojunction formed between TiO2 and SiC, the photocatalytic oxidation performance is effectively improved.

Description

technical field [0001] The invention belongs to the field of material preparation and relates to a SiC / TiO 2 Preparation method of composite photocatalytic nanoparticles. Background technique [0002] Titanium dioxide is an important n-type wide bandgap semiconductor, in which anatase phase titanium dioxide has unique properties such as high photocatalytic activity, good hydrophilicity, good thermal stability, non-toxicity and no secondary pollution, etc. Make it the most potential green photocatalyst in recent years. However, there are still many problems restricting its application in titanium dioxide photocatalytic technology, among which there are two most critical problems: one is the high recombination rate of titanium dioxide photogenerated electron-hole pairs, which makes the photogenerated holes unable to be effectively absorbed by H 2 O or OH - Capture and form hydroxyl radicals (·OH), which reduces the oxidation performance and efficiency; the second is that ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/224B82Y30/00B82Y40/00
CPCB01J27/224B82Y30/00B82Y40/00
Inventor 朱嘉琦李一村代兵韩杰才杨磊曹文鑫舒国阳
Owner HARBIN INST OF TECH
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