Amorphous photonic crystal schemochrome material based on black titanium dioxide and silicon dioxide composite and preparation method of amorphous photonic crystal schemochrome material

A technology of black titanium dioxide and photonic crystals, applied in the direction of titanium oxide/hydroxide, silicon dioxide, titanium dioxide, etc., can solve the problems of being unable to reduce environmental pollution and not degrading pollutants by sunlight, so as to avoid oxygen vacancy defects, Simple preparation process and good photocatalytic effect

Inactive Publication Date: 2019-10-08
SHAANXI UNIV OF SCI & TECH
2 Cites 8 Cited by

AI-Extracted Technical Summary

Problems solved by technology

Structural pigments without angle dependence can replace traditional chemical pigments in use due to their characteristics of never fading and soft colors, but structural color materials still cannot alleviate environmental pollution problems in the application process
[0004] Structural color has been extensively studied and deeply explored by researchers for its functionalization because of its physical coloring characteristics. It has great potential for the industrial production of non-angle-dependent structural colorants with amorphous...
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Method used

In summary, a kind of amorphous photonic crystal structure color material with photocatalytic effect based on black titanium dioxide and silicon dioxide composite disclosed by the present invention and preparation method thereof include black titanium dioxide nanoparticles and different particle diameters Preparation of silica microspheres; different proportions of P25 and NaBH4 were calcined in vacuum to obtain black titanium dioxide reduced to varying degrees, and -B-TiO2 containing different oxygen vacancies was obtained after washing with deionized water and absolute ethanol Nanoparticles; the appearance of oxygen vacancies reduces the 3.2eV band gap of white titanium dioxide and broadens the light absorption range of black titanium dioxide photocatalysts. Structural color materials with different colors can be prepared by preparing SiO2 with different particle sizes as the structural unit of photonic crystals. The introduction of black titanium dioxide nanoparticles can not only prepare different colors of structural color materials with photocatalytic effect in one step, but also can regulate the chromaticity of structural color materials by adjusting the content of black titanium dioxide. Amorphous photonic crystal structure pigments with photocatalytic effects and different colors directly synthesized by ultrasonic blending method can meet the demand for environmental protection pigments in production and life, and the development of materials combining structural color and photocatalytic function has broad prospects.
The present invention has the amorphous photonic crystal structure color material B-TiO2/SiO2 of photocatalysis function and adopts ultrasonic blending method to prepare, and black titanium dioxide is attached on the surface of silicon dioxide microspheres, and the color of the structure color material prepared is soft and rich in color , At the same time, the addition of black titanium dioxide can adjust the chromaticity and photocatalytic performance of the structural color. The prepared amorphous photonic crystal structural chromatic material has photocatalytic performance, brilliant color and non-angle-dependent structural chromatic material, which breaks the existing limitation of using carbon black as the background to absorb coherent scattered light to prepare non-angle-dependent color materials. This method realizes the...
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Abstract

The invention provides an amorphous photonic crystal schemochrome material based on black titanium dioxide and silicon dioxide composite and a preparation method of the amorphous photonic crystal schemochrome material. The material component comprises SiO2 amorphous photonic crystal and black TiO2, and the mass ratio of the black TiO2 and the SiO2 amorphous photonic crystal is 1 to (0.1-1). The preparation method comprises the steps that (1) black TiO2 nanoparticle powder is prepared, and SiO2 amorphous photonic crystal microsphere powder is prepared; (2) the black TiO2/ SiO2 materials are prepared, specifically, the SiO2 amorphous photonic crystal microsphere powder and the black TiO2 nanoparticle powder are dissolved in ethanol, ultrasonic dispersion is conducted after stirring, and theproduct is dried. According to the preparation method, the schemochrome is combined with the photocatalysis function, the limitation of preparing non-angle independent color material by absorbing coherent scattering light with carbon black as the back bottom is broken, and the obtained material has the function of photocatalytic degradation of pollutants at the same time.

Application Domain

Technology Topic

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  • Amorphous photonic crystal schemochrome material based on black titanium dioxide and silicon dioxide composite and preparation method of amorphous photonic crystal schemochrome material
  • Amorphous photonic crystal schemochrome material based on black titanium dioxide and silicon dioxide composite and preparation method of amorphous photonic crystal schemochrome material
  • Amorphous photonic crystal schemochrome material based on black titanium dioxide and silicon dioxide composite and preparation method of amorphous photonic crystal schemochrome material

Examples

  • Experimental program(5)

Example Embodiment

[0035] 2)SiO2 2 Preparation of microspheres
[0036] Drop the ethanol solution of ethyl orthosilicate into the ethanol solution of ammonia water, make the concentration of ammonia water 0.1-0.6mol/L, and the concentration of ethyl orthosilicate 0.4-1.2mol/L, stir the reaction, centrifuge after the reaction is completed, Washed and dried to obtain SiO 2 microsphere powder;
[0037] 3) B-TiO 2 /SiO 2 material preparation
[0038] Weigh SiO according to the mass ratio of 1:(0.1~1) 2 Powder and B-TiO2 Powder, according to the ratio of (1 ~ 2) g: 50ml SiO 2 The powder was dissolved in ethanol, and then the corresponding B-TiO was added 2 The powder is ultrasonically dispersed for a certain period of time after being stirred for 2 hours, and dried at room temperature after sufficient reaction to obtain an amorphous photonic crystal structural color material based on black titanium dioxide and silicon dioxide with a photocatalytic effect.
[0039] In step 1), the grinding time is 1-3 hours, the reaction temperature is 250-400° C., and the holding time is 0.5-4 hours. The washing was performed by cross-washing with deionized water and absolute ethanol four times, and drying at room temperature. Nano powder refers to nano microspheres between 20-50nm.
[0040] Step 2) in, reaction temperature is 25~50 ℃, SiO 2 The particle size of the microspheres is between 180-400nm.
[0041] In step 3), the stirring speed is 600r/min, and the sufficient reaction time is 2-12h for ultrasonic dispersion.

Example Embodiment

[0042] Example 1
[0043] An amorphous photonic crystal structural color material with photocatalytic effect based on the composite of black titanium dioxide and silicon dioxide and a preparation method thereof, comprising the following steps:
[0044] 1) Black TiO2 2 (B-TiO 2 ) Preparation of nanoparticles
[0045] Weigh P25(TiO 2 ) and NaHB 4 , ground with an agate mortar, mixed evenly, heated up to 380°C at a heating rate of 7°C/min, heat-treated at 380°C in vacuum for 3 hours, and cooled naturally. After the reaction was completed, cross-wash with deionized water and ethanol four times, and dry at room temperature to obtain B-TiO 2 Nano powder.
[0046] 2)SiO2 2 Preparation of microspheres
[0047] Drop the ethanol solution of ethyl orthosilicate into the ethanol solution of ammonia water, so that the concentration of ammonia water is 0.1mol/L, and the concentration of ethyl orthosilicate is 0.8mol/L. Stir and react at 36°C for 4 hours. After the reaction is completed, centrifuge, Washing and drying to obtain SiO with a diameter of 320nm 2 powder of microspheres;
[0048] 3) B-TiO 2 /SiO 2 material preparation
[0049] Weigh SiO at a mass ratio of 1:1 2 Powder and B-TiO 2 Powder, according to the ratio of 2g:50ml SiO 2 The powder was dissolved in ethanol, and then the corresponding B-TiO was added 2 The powder is stirred for 4 hours, then ultrasonically dispersed for 8 hours, fully reacted and then dried at room temperature to obtain an amorphous photonic crystal structure color material based on black titanium dioxide and silicon dioxide with photocatalytic effect.
[0050] Samples of the amorphous photonic structural color material with photocatalytic effect prepared in this embodiment are as follows: figure 1 As shown, the green powder has a pastel tint. like figure 2 It is its X-ray diffraction pattern, and the diffraction angles 2θ=25.28°, 36.95°, 48.05°, 53.89°, 55.06°, 62.69°, 68.76° correspond to TiO 2 (101), (103), (200), (105), (204) and (116) crystal faces, due to the SiO formed by the sol method 2 is amorphous, which proves that the sample is pure anatase phase TiO 2 Nanoparticles and SiO 2 blending; image 3 The UV-Vis diffuse reflectance spectrum shows that B-TiO 2 /SiO 2 It can absorb ultraviolet light and part of visible light before 400nm, and a reflection peak appears at 525nm, which is consistent with the relationship between the microsphere particle size and wavelength of the Bragg diffraction law, and 248nm corresponds to the green light band in the visible light range (480-560nm) ; Figure 4 is the B-TiO prepared in Example 1 2 Nanopowder, it can be seen from the figure that the black titanium dioxide nanoparticles are between 20-50nm. Figure 5 For the obtained B-TiO of embodiment 1 2 /SiO 2 It can be seen from the SEM image that B-TiO exists between the smooth silica microspheres with uniform particle size. 2 Nano ion, SiO 2 The introduction of the black titanium dioxide provides attachment sites, improving the B-TiO 2 dispersion and specific surface area. exist Figure 5 The Fourier transform in the inset shows the B-TiO obtained after the composite of black titanium dioxide and silicon dioxide 2 /SiO 2 It is an amorphous photonic crystal structure with long-range disorder and short-range order. Image 6 For the B-TiO obtained in Example 1 2 /SiO 2 Photocatalytic degradation diagram of rhodamine B, B-TiO obtained after composite of black titanium dioxide and silicon dioxide 2 /SiO 2 After 60min under ultraviolet light, the degradation rate of RhB reached 83%. It can be seen that the introduction of black titanium dioxide not only absorbs coherently scattered light in white silica and displays color, but also improves the photocatalytic performance, realizing the one-step synthesis of soft-colored amorphous photonic structural color materials with photocatalytic effect.

Example Embodiment

[0051] Example 2
[0052] 1) Black TiO2 2 (B-TiO 2 ) Preparation of nanoparticles
[0053] Weigh P25(TiO 2 ) and NaHB 4 , ground with an agate mortar, mixed evenly, heated up to 250°C at a heating rate of 7°C/min, heat treated in vacuum at 250°C for 2 hours, and cooled naturally. After the reaction was completed, cross-wash with deionized water and ethanol four times, and dry at room temperature to obtain B-TiO 2 Nano powder.
[0054] 2)SiO2 2 Preparation of microspheres
[0055] Drop the ethanol solution of ethyl orthosilicate into the ethanol solution of ammonia water, so that the concentration of ammonia water is 0.2mol/L, and the concentration of ethyl orthosilicate is 0.4mol/L. Stir and react at 25°C for 6h. After the reaction is completed, centrifuge, Washing and drying to obtain SiO with a diameter of 180nm 2 powder of microspheres;
[0056] 3) B-TiO 2 /SiO 2 material preparation
[0057] Weigh SiO at a mass ratio of 1:0.1 2 Powder and B-TiO 2 Powder, according to the ratio of 1g: 50ml SiO 2 The powder was dissolved in ethanol, and then the corresponding B-TiO was added 2 The powder is stirred for 2 hours, then ultrasonically dispersed for 10 hours, fully reacted and dried at room temperature to obtain an amorphous photonic crystal structure color material based on black titanium dioxide and silicon dioxide with photocatalytic effect.
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PUM

PropertyMeasurementUnit
Diameter320.0nm
Diameter180.0nm
Diameter240.0nm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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