Nitrogen-phosphor codoping titanium oxide multi-stage aperture photocatalysis material and method for making same

A catalytic material, titanium oxide technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of nano-crystal particle agglomeration and growth, and achieve simple preparation process and equipment, good industrialization The effect of production prospects

Inactive Publication Date: 2007-08-08
NANKAI UNIV
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Problems solved by technology

CN1557540A discloses a preparation method of N-doped titanium oxide mesoporous photocatalytic material, which is similar to the methods reported in most documents and patents, using titanate and thiourea as raw materials to synthesize Ti-based precursors, and then using this p

Method used

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  • Nitrogen-phosphor codoping titanium oxide multi-stage aperture photocatalysis material and method for making same
  • Nitrogen-phosphor codoping titanium oxide multi-stage aperture photocatalysis material and method for making same

Examples

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Example Embodiment

[0029] Example 1

[0030] With the butyl titanate of 8.7g and n-propanol (mass ratio is 28: 1) mixed solution, add in 30ml phosphoric acid solution (pH=2), stir 2 hours, then transfer into 80 degree autoclave and carry out aging 48 Hours, take out, wash, and dry at 60°C. A precursor powder is obtained. Weigh the precursor 2g, add 5ml of urea aqueous solution (2mol / L), stir for three hours, age at room temperature for 24 hours, dry, and roast for 2 hours at 350, 400, and 450°C in an air atmosphere, and the obtained light yellow-brown powder is nitrogen. Phosphorus co-doped macroporous-mesoporous titanium dioxide. Figure 1 is a scanning electron microscope photograph, showing that the sample has macroporous channels regularly arranged in the range of 0.5-2 μm. Figure 2 is the nitrogen adsorption-desorption isotherm and the corresponding pore size distribution map, the mesopore pore size is 0.21-0.35nm, and the specific surface is as high as 272m 2 / g. Figure 3 is its XRD sp...

Example Embodiment

[0031] Embodiment 2

[0032] 8.7g of butyl titanate was added to 30ml of phosphoric acid solution (pH=2), stirred for 2 hours, then transferred to an 80-degree autoclave for aging for 48 hours, taken out, washed with distilled water, and dried at 60°C to obtain a precursor powder . Weigh 2g of precursor, add 5ml of urea aqueous solution (2mol / L), stir for three hours, age at room temperature for 24 hours, dry, and roast for 2 hours at 350, 400, and 450°C in air atmosphere, and the obtained light yellow-brown powder is Nitrogen-phosphorus co-doped macroporous-mesoporous titanium dioxide. The XRD pattern shows that the sample is anatase phase titanium oxide. Nitrogen adsorption analysis shows that the mesopore diameter is 0.27-0.36nm, and the specific surface is as high as 261m 2 / g. Elemental analysis showed that the sample contained 1.12% nitrogen and 1.32% phosphorus. Figure 4 is the UV-vis absorption spectrum, showing that the absorption sideband of the titanium oxide m...

Example Embodiment

[0033] Embodiment 3

[0034] After getting each 20ml of urea aqueous solution (2mol / L) and phosphoric acid solution (pH=2) to mix, add 34.8g n-butyl titanate, stir for 2 hours, then transfer into 60 degree autoclave and carry out aging for 48 hours, after taking out Washed and dried at 60°C. The obtained solid powder is calcined at 350-550° C. for 6 hours in an air atmosphere to obtain a light yellow-brown powder sample, which is a nitrogen-phosphorus co-doped titanium oxide material. The sample has macroporous channels regularly arranged around 2μm, the mesopore diameter is 2-5nm, and the specific surface is as high as 359m2 / g. Elemental analysis showed that the sample contained 1.5% nitrogen and 3.2% phosphorus.

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Abstract

The invention discloses a titanium oxide porous optical catalyst and making method, which is made of nanometer titanium oxide with 0.14%-2.0% nitrogen and 1.3-19.7% phosphor to synthesize titanium based primer to sinter at 350-550 deg.c.

Description

technical field [0001] The invention relates to a nitrogen-phosphorus co-doped titanium oxide multi-level porous photocatalytic material and a preparation method thereof, belonging to the field of inorganic nano photocatalytic materials. Background technique [0002] Photocatalyst is a semiconductor material with photocatalytic activity under the irradiation of external light source. The preparation of semiconductor material used as photocatalyst is the core technology of photocatalytic oxidation. Anatase Phase Nano TiO 2 Photocatalysts are not only stable in chemical and optical properties, but also have high activity. They are currently the photocatalysts commonly used in photocatalytic technology. However, due to its wide forbidden band (Eg=3.2eV), it can only be excited by ultraviolet light (λ≤387.5nm) which accounts for only about 5% of sunlight, thus increasing its quantum yield and broadening the TiO 2 The response to visible light, which accounts for 46% of solar r...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J27/14
Inventor 袁忠勇邵高耸张雪军王震宇
Owner NANKAI UNIV
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