Nitrogen doped titanium oxide mesoporous photocatalysis material and preparation method thereof

A photocatalytic material, titanium oxide technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of titanium oxide lattice deformation, the difficulty of controlling the ratio of anatase and rutile mixed crystals, etc. problems, to achieve the effect of improving utilization efficiency, good industrial production prospects, and high photocatalytic activity

Inactive Publication Date: 2006-09-13
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

TiO2 target sputtering is easy to cause lattice deformation of titanium oxide, and the ratio of anatase and rutile mixed crystals is not easy to control: ion implantation method requires expensive ion implantation equipment, etc.; besides, the main problem at present is what kind of doping is the most effective, It can improve the utilization efficiency of sunlight and has high visible light catalytic activity

Method used

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  • Nitrogen doped titanium oxide mesoporous photocatalysis material and preparation method thereof
  • Nitrogen doped titanium oxide mesoporous photocatalysis material and preparation method thereof
  • Nitrogen doped titanium oxide mesoporous photocatalysis material and preparation method thereof

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Embodiment 1

[0035] 34.0g butyl titanate and 30.4g thiourea were mixed and stirred in ethanol solvent for 2 hours, then evaporated to remove ethanol, dried at 80~C to obtain white precursor powder, and then treated in ammonia flow at 450~C for 6 hours, The obtained reddish-brown substance is N-doped titanium oxide powder after grinding. The particle size of the powder is 10-40nm. A 300W high-pressure mercury lamp with a cut-off wavelength of 400nm was used as a light source, and 0.3g of photocatalyst was suspended in 400ml of 50mg / L methylene blue aqueous solution to test its photocatalytic performance. figure 2 Its XRD pattern shows titanium oxide in the anatase phase. image 3 It is the nitrogen adsorption / desorption curve and the corresponding pore size distribution diagram, showing an average pore size of 4.2nm and a specific surface area of ​​217m2 / g. Elemental analysis indicated that the sample contained 2.2% nitrogen. Figure 4 For the UV-vis absorption spectrum plant, the (c) c...

Embodiment 2

[0037] Nitrogen-doped anatase titanium oxide powder was obtained by treating the precursor at 500°C for 3 hours in an ammonia flow. Other experimental steps are the same as in Example 1. Elemental analysis indicated that the sample contained 7.6% nitrogen. The prepared photocatalyst can degrade 89% of methylene blue after 4 hours of visible light irradiation.

Embodiment 3

[0039] Nitrogen-doped anatase titanium oxide powder was obtained by treating the precursor at 550°C for 3 hours in an ammonia flow. Other experimental steps are the same as in Example 1. Elemental analysis indicated that the sample contained 1.6% nitrogen. The prepared photocatalyst can degrade 85% of methylene blue after 4 hours of visible light irradiation.

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Abstract

The present invention prepares nitrogen-doped mesoporous titania photocatalyst material with titanium alkoxide and thiourea as material to synthesize Ti-base precursor and through decomposing the precursor in furnace with ammonia atmosphere at 450-550 deg.c for 6-8 hr. The formation of nano titania crystal grain and the doping with nitrogen element are completed simultaneously, and N atom replaces O atom in TiO2 lattice effectively to form the doping energy level. The prepared material has titania as base, c anatase rystal phase, nitrogen content of 1.6-7.6 wt%, and mesopore size of 1-8 nm. The nitrogen-doped mesoporous titania photocatalyst has UV-vis absorption spectrum beginning at 735 nm, is used as photocatalyst and can degrade 90 % of methylthionine chloride in 4 hr.

Description

technical field [0001] The invention relates to a nitrogen-doped titanium oxide mesoporous photocatalytic material and a preparation method thereof, belonging to the field of fine chemical industry. Background technique [0002] Titanium oxide, commonly known as titanium dioxide, is a functional material with a wide range of uses. industrial technology applications. The basis for the application of such materials lies in their unique properties, such as material spectral properties, energy band properties, surface states, etc. [0003] Titanium oxide has good activity as a photocatalyst excited by ultraviolet light, and has high activity in the mineralization of pollutants and the production of hydrogen from water, but ultraviolet light only accounts for 2 to 3% of the solar spectrum. Therefore, The photocatalytic performance of TiO has encountered great obstacles in practical applications. By doping or sensitizing titanium oxide, its surface characteristics can be change...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J27/24
Inventor 高濂杨松旺
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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