Carbou doped titanium-oxide graded hole photocatalytic material and preparing method

A technology of photocatalytic materials and catalytic materials, which is applied in the field of carbon-doped titanium oxide graded hole photocatalytic materials and its preparation, can solve the problems of harsh preparation conditions and complicated processes, and achieve the reduction of liquid diffusion resistance, preparation process and equipment Simple, enhanced photocatalytic activity effect

Inactive Publication Date: 2007-08-29
天津神能科技有限公司
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Most of the above-mentioned carbon-doped TiO2 preparations are under high-temperature conditions, and a small amount of low-temperature synthesis reports require the participation of potassium ions. The preparation conditions are harsh and the process is complicated, and most of the prepared carbon-doped TiO2 are dense and non-porous, and there are occasional reports of mesopores. sex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 10.0 ml of n-butyl titanate and 0.688 g of DDA were added to a 100 ml volumetric flask at 80° C., and their mass ratio was 0.075. Then quickly add 40ml of ethanol aqueous solution with a volume ratio of 7:1, slowly stir for 3h, age at 80°C for 48h, filter, wash with water, and dry to obtain a white powder solid, and the primary product is roasted at 400°C under the protection of nitrogen in a tube furnace After cooling for 8 hours, a yellowish powder solid was obtained. Scanning electron micrographs show that the sample has regularly arranged macropore channels with a pore size of 0.5-1 μm. The nitrogen adsorption isotherm is type IV, and the mesopore diameter ranges from 2.3 to 13.5nm. Transmission electron micrographs show that the mesoporous structure is worm-like. The X-ray diffraction spectrum shows that the sample is a single anatase phase titanium oxide. The ultraviolet-visible absorption spectrum shows that the absorption edge band of the carbon-doped titaniu...

Embodiment 2

[0022] Add 20ml of deionized water and 6.8g of n-butyl titanate into a 100ml volumetric flask at room temperature, stir slowly for 1 hour, then add 4.007g of vitamin B6, continue to stir slowly for 3 hours, let stand at room temperature for 24 hours, dry to obtain white Solid powder, white powder solid is heated at 400°C for 6 hours under a nitrogen atmosphere for carbonization, and cooled to obtain a carbon-doped titanium oxide material. The product has a large pore channel with a pore size of 0.3-1 μm and an anatase phase. The nitrogen adsorption-desorption isotherm is type IV, and the corresponding BJH pore size distribution has double mesoporous distribution at 2.0nm and 24.0nm, and the specific surface is as high as 691m 2 / g.

Embodiment 3

[0024] Take 0.02 g of the sample synthesized in Example 1 and Example 2 as a catalyst, suspend in 100 milliliters of 4.8 mg / liter rhodamine B aqueous solution, and use a 125W high-pressure mercury lamp with a cut-off wavelength of 365 nm as a light source to test its catalytic performance. Simultaneously with undoped TiO 2 Powder samples were used for comparative experiments. The results show that under the same experimental conditions, after 1h of ultraviolet light irradiation, the catalysts prepared by Example 1 and Example 2 all have more than 95% degradation of Rhodamine B, while the undoped TiO 2 The degradation of Rhodamine B by the samples was less than 60%. When using a 500W incandescent lamp as the light source, the carbon-doped TiO synthesized by Example 1 and Example 2 2 The photocatalytic activity of the catalyst for the degradation of rhodamine B is undoped TiO 2 2-3 times.

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Abstract

This invention relates to TiO2 photocatalysis materials preparation, particularly relates to a classification carbon-doped titanium dioxide catalyst material and preparation method. This invention is a kind of the carbon-doped titanium dioxide with mesoporous - macroporous grade pore structure, carbon 3-25%, anatase phase, the big channel pore size of 300-1000nm, mesoporous aperture 2.0-24nm, the specific surface area can be as high as 691m2/g. The described material is prepared by titanate and carbon mixture hydrolysis product of the roasting 300-600deg.C, and preparation of equipment used simple, the described materials in organic dye molecules have good catalytic properties on the photodegradation.

Description

technical field [0001] The present invention relates to the preparation of titanium oxide photocatalytic material, especially a kind of carbon-doped titanium oxide hierarchical hole photocatalytic material and its preparation method. catalytic degradation. Background technique [0002] Since Teng Daozhao of the University of Tokyo and his mentor Professor Domoto Kenichi first discovered the principle and efficacy of photocatalysis in 1972, the research on titanium dioxide photocatalysis has been very active and has been widely used in the development of solar cells, gas sensors, and solar energy decomposition systems. Hydrogen, photocatalytic degradation of sewage and wastewater, photocatalytic sterilization, self-cleaning and anti-fog, etc. But TiO 2 Its forbidden band is wide (Eg=3.2eV), and it can only be excited by ultraviolet light (λ≤387.5nm), which accounts for only about 5% of sunlight. Therefore, to improve its quantum yield, broaden the TiO 2 The response to vi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J21/18
Inventor 袁忠勇邵高耸张雪军王震宇
Owner 天津神能科技有限公司
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