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Brookite titanium dioxide nanocrystalline and preparation method and application thereof

A titanium dioxide, nanocrystal technology, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the limitation of large-scale production and application, the difficulty of pure-phase brookite synthesis, the difficulty of brookite synthesis, etc. problem, to achieve the effects of excellent catalytic activity, low production cost, and easy variation

Inactive Publication Date: 2012-10-10
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, brookite, as a metastable phase, often occurs in the mixed phase of anatase and rutile, and the synthesis of pure phase brookite is quite difficult.
Although there are reports of using titanate or titanium-containing complexes as precursors to prepare brookite, these methods have many obvious defects, such as the use of strong alkaline (pH ≥ 10) or strong acidic (pH ≤ 2) solution, higher reaction temperature (≥ 220 o C) and longer reaction time (≥ 48 h) and complex preparation process, etc., to a large extent limit the large-scale production and application of brookite crystal form titanium dioxide; The synthesis of nanoscale (≤100 nm) brookite is more difficult, and there are few reports in the literature

Method used

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  • Brookite titanium dioxide nanocrystalline and preparation method and application thereof
  • Brookite titanium dioxide nanocrystalline and preparation method and application thereof
  • Brookite titanium dioxide nanocrystalline and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1: In a fume hood, TiCl 4 The liquid was slowly added dropwise into the deionized water cooled and stirred in an ice-water bath, and the concentration of the solution was adjusted to 0.5 M. The above titanium-containing solution was taken out from the ice-water bath, and stirred at room temperature for about 60 min. Then urea was added to the above solution and stirred to dissolve, and its concentration was controlled to be 1.0 M. Next, sodium lactate solution (50%) was added to the mixed solution and stirred evenly so that the concentration of sodium lactate was maintained at 0.4 M. Finally, the mixed solution is packed into the reactor and sealed, 190 o C for 12 h. After the reaction was completed, the product was separated, washed 3 times by centrifugation with ethanol and deionized water, and placed in an oven at 90 o C drying for 12 h to obtain a white powder sample. The XRD patterns of the prepared brookite samples are as follows figure 1 As shown, t...

Embodiment 2

[0031] Example 2: In a fume hood, TiCl 4 The liquid was slowly added dropwise into the deionized water cooled and stirred in an ice-water bath, and the concentration of the solution was adjusted to 0.3 M. The above titanium-containing solution was taken out from the ice-water bath, and stirred at room temperature for about 30 min. Then urea was added to the above solution and stirred to dissolve, and its concentration was controlled to be 0.8 M. Next, sodium lactate solution (50%) was added to the mixed solution and stirred evenly so that the concentration of sodium lactate was maintained at 0.2 M. Finally, the mixed solution is packed into the reactor and sealed, 200 o C for 12 h. After the reaction was completed, the product was separated, washed 3 times by centrifugation with ethanol and deionized water, and placed in an oven at 80 o C drying for 10 h to obtain a white powder sample.

Embodiment 3

[0032] Example 3: In a fume hood, TiCl 4 The liquid was slowly added dropwise into the deionized water cooled and stirred in an ice-water bath, and the concentration of the solution was adjusted to 0.5 M. The above titanium-containing solution was taken out from the ice-water bath, and stirred at room temperature for about 60 min. Then urea was added to the above solution and stirred to dissolve, and its concentration was controlled to be 1.2 M. Next, sodium lactate solution (50%) was added to the mixed solution and stirred evenly so that the concentration of sodium lactate was maintained at 0.3 M. Finally, the mixed solution is packed into the reactor and sealed, 190 o C reacted for 20 h. After the reaction was completed, the product was separated, washed 3 times by centrifugation with ethanol and deionized water, and placed in an oven at 90 o C drying for 12 h to obtain a white powder sample.

[0033] (2) Preparation of precious metal-supported brookite titanium dioxide...

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Abstract

The invention discloses brookite titanium dioxide nanocrystalline and a preparation method. The nanocrystalline has a regular chamfer square profile, has uniform particle size with the length of 60 to 80nm, the width of 40 to 60nm, and the thickness of 15 to 30nm; and four crystal planes (210), two crystal planes (101) and two crystal planes (201) are exposed. The pure phase and precious metal loaded brookite titanium dioxide nanocrystalline with the special exposed crystal planes show superior photocatalytic activity and have very wide application prospect in the field of catalysis and the related fields.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and relates to a pure-phase and precious metal-loaded brookite titania nanocrystal photocatalytic material with special exposed crystal planes and a preparation method thereof. Background technique [0002] Due to the small size effect, quantum size effect, surface effect, dielectric confinement effect, and macroscopic quantum tunneling effect, nanomaterials exhibit special properties different from macroscopic materials in terms of catalysis, magnetism, electricity, and optics. With the help of the special properties of nanomaterials, the application of semiconductor materials in the fields of light, electricity, magnetism, and sensors has been greatly expanded. Among them, titanium dioxide, as a class of widely used semiconductor materials, plays an important role in the fields of catalysis and photocatalysis, white pigments and cleaning coatings, and dye-sensitized solar cells. In recent ye...

Claims

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Application Information

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IPC IPC(8): C01G23/047B01J23/42B01J23/52B01J23/50B01J23/44C02F1/32B82Y40/00
Inventor 李广社林海峰李丽萍关翔锋黄新松
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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