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A low-cost, high-efficiency porous black tio 2 Preparation method of photocatalyst

A photocatalyst, low-cost technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low catalytic efficiency and small specific surface area, so as to improve catalytic efficiency and increase specific surface area , the effect of low synthesis temperature

Inactive Publication Date: 2019-10-25
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small specific surface area of ​​this titanium foil, the catalytic efficiency is still relatively low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The preparation of a low-cost and high-efficiency porous black TiO2 photocatalyst is as follows:

[0014] (1) Using Ti powder (particle size 1-5μm) as raw material, H2O2 solution (mass fraction of 30%) as etchant, the mass fraction of Ti is 4g, the amount of H2O2 solution is 120ml, in a 60℃ water bath The pot is heated and reacted for 2 hours. After centrifugation, washing and drying, a microscopic porous powder containing some suboxides is obtained.

[0015] (2) Put the etched powder into a muffle furnace, and raise the temperature to 500°C at a temperature rising rate of 5°C / min for 2 hours to obtain a porous black TiO2 photocatalyst.

[0016] The porous black TiO2 photocatalyst obtained in this example has a black color, small holes are etched on the surface of the particles, and the catalytic efficiency is 30%.

Embodiment 2

[0018] According to the Ti powder mass is 4g and the amount of H2O2 solution is 160ml, it is heated and reacted in a 60℃ water bath for 3 hours to prepare a microporous powder containing some suboxides. According to the method of Example 1, wherein the calcination process is heating to 450° C. and holding for 1 hour to prepare the obtained porous black TiO2 photocatalyst, the color of which is black, the surface of each particle is etched with small holes, and the catalytic efficiency is 50%.

Embodiment 3

[0020] According to the mass of Ti powder 2g and the amount of H2O2 solution 100ml, the reaction was heated in a 60℃ water bath for 2h to prepare microscopic porous powder containing partial suboxide. According to the method of Example 1, wherein the calcination process is heating to 400° C. and holding for 1 hour to prepare the obtained porous black TiO2 photocatalyst, the color of which is black, the surface of each particle is etched with small holes, and the catalytic efficiency is 45%.

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PUM

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Abstract

The invention discloses a low-cost and efficient porous black TiO2 photocatalyst with visible-light response and a preparation method therefor. According to the photocatalyst and the preparation method therefor, black titanium dioxide, which contains partial sub-oxides and has visible-light response, is prepared through replacing the former high-temperature high-pressure hydrogenation method with a method for etching titanium powder by a H2O2 solution, so that the problems in the former preparation of the black titanium dioxide that the process is complicated and the cost is high are solved; powder particles are directly etched microscopically by ingeniously using the principle of plate etching, so that porous particles are formed, the specific surface area of materials is increased greatly, and the catalytic efficiency is increased; and the black titanium dioxide with visible light absorption is combined with a special porous structure, so that the photocatalytic efficiency is further increased.

Description

Technical field [0001] The invention relates to a photocatalyst, in particular to a porous black TiO2 photocatalyst. Background technique [0002] Due to its high efficiency, chemical stability, and non-toxicity in the photocatalytic process, titanium dioxide is one of the most in-depth researched materials among various photocatalysts. It has applications in dye-sensitized solar cells, lithium-ion batteries, catalysts for hydrolysis to produce hydrogen, self-cleaning coatings, and catalysts for water treatment. However, the photocatalytic efficiency of titanium dioxide is limited by its wide band gap, and the photon spectrum capable of generating electron-hole pairs is limited to the ultraviolet region. There are basically two ways to improve the catalytic efficiency: (1) Improve the absorption and utilization of visible light and infrared light by the catalyst; (2) Increase the specific surface area of ​​the titanium dioxide particles. [0003] Research has found that black tit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J37/00B01J35/10
CPCB01J21/063B01J35/004B01J35/10B01J37/00
Inventor 黄楚云郭伟明陈珊璐林华泰
Owner GUANGDONG UNIV OF TECH