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Preparation method of titanium dioxide nano hollow ball

A titanium dioxide, hollow sphere technology, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of difficult washing process and product agglomeration, and achieves simple process, mild reaction conditions, and obvious photocatalytic effect. Effect

Inactive Publication Date: 2012-11-21
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology uses surfactants and organic hydrolysis control agents, which cause difficulties in the sample washing process, and the calcination process will also produce waste gas that is not conducive to the environment. At the same time, the aging time is too long, which is easy to cause product agglomeration

Method used

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  • Preparation method of titanium dioxide nano hollow ball
  • Preparation method of titanium dioxide nano hollow ball
  • Preparation method of titanium dioxide nano hollow ball

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1.5mmol CuSO 4 Add 100mL deionized water, then add 1~10g glucose, stir to dissolve into a transparent solution. Then add 1mL of 0.1M ammonia water, flocculent precipitation appears, then slowly add 10mL of Na(OH) solution with a concentration of 1~10M, and finally add 50mL of ascorbic acid with a concentration of 1~5g / L quickly, keep stirring for 1h, and centrifuge the precipitate. Wash and dry. Get Cu 2 O nanospheres. Depend on figure 1 It can be seen that the prepared Cu 2 The surface of the O nanosphere is rough, the diameter is about 200nm, the size is uniform, and the dispersion is good.

[0030] The prepared Cu 2 O nanospheres were ultrasonically dispersed in 20 mL of absolute ethanol, then 0.01–3 mL of tetra-n-butyl titanate was dissolved in 20 mL of absolute ethanol, and slowly added dropwise to the above Cu 2 O / ethanol suspension, magnetically stirred for 1 h. Add 20mL of V (water) / V (ethanol)=1~9:1 solution to the above solution, continue to stir for 1...

Embodiment 2

[0032] The Cu prepared in Example 1 2 O nanospheres were calcined at a temperature of 100-500°C for 1-4h to obtain CuO nanospheres of the same size, and the product was centrifuged and washed with distilled water.

[0033] The prepared CuO nanospheres were ultrasonically dispersed in 20mL of absolute ethanol, then 0.01~3mL of tetra-n-butyl titanate was dissolved in 20mL of absolute ethanol, slowly added dropwise to the above CuO / ethanol suspension, and magnetically stirred for 1h . Add 20mL of V (water) / V (ethanol)=1~9:1 solution to the above solution, continue stirring for 1h, centrifuge, wash with ethanol, add to 1M sulfuric acid solution for etching and dissolving for 1~24h, After centrifugation and washing, amorphous titanium dioxide hollow spheres are obtained at room temperature. The product was calcined at 250-650°C for 6 hours to obtain anatase-type titanium dioxide hollow nanospheres with a high degree of crystallization.

Embodiment 3

[0035] Template Cu 2 The preparation method of O nanospheres is the same as in Example 1.

[0036] The prepared Cu 2 O nanospheres were ultrasonically dispersed in 20 mL of absolute ethanol, then 0.01–3 mL of tetraisopropyl titanate was dissolved in 20 mL of absolute ethanol, and the above Cu 2 O / ethanol suspension, magnetically stirred for 1 h. Add 20mL of V (water) / V (ethanol)=1~9:1 solution to the above solution, continue to stir for 1h, centrifuge, wash with ethanol, add to 1.5M hydrochloric acid solution for etching and dissolving for 1~24h , centrifuged and washed to obtain titanium dioxide hollow spheres at room temperature. The product was calcined at 250-650°C for 6 hours to obtain anatase-type titanium dioxide hollow nanospheres with a high degree of crystallization.

[0037] attached by figure 2 , 3 It can be seen that the synthesized titanium dioxide nano hollow spheres are anatase titanium dioxide with uniform size and good dispersion.

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Abstract

The invention discloses a preparation method of a titanium dioxide nano hollow ball. The method comprises steps of: using Cu2O or CuO nano ball as a template; adding organic or inorganic titanium salt / ethanol solution into the Cu2O or CuO ethanol suspension; carrying out magnetic stirring, and adding 20mL of a mixed solution containing distilled water and ethanol in a volume ratio of 1-9:1 continuing to stir for 1h, centrifuging to separate the sample, washing the sample with ethanol, and adding ammonia water or an acid solution to etch and dissolve the template; carrying out centrifuge separation and washing to obtain an amorphous TiO2 nano hollow ball; carrying out follow-up heat treatment at 250-650 DEG C to obtain an anatase type of TiO2 nano hollow sphere with high degree of crystallization. The invention adopts a template method, and has advantages of simple preparation process, mild reaction conditions and no addition of any additive damaging the environment. The TiO2 nano hollow ball has uniform size, good dispersibility and large specific surface area, and has obvious catalytic effect as a photocatalyst.

Description

1. Technical field [0001] The invention relates to a preparation method of titanium dioxide nanometer hollow spheres and its application as a photocatalyst for treating dye wastewater. 2. Background technology [0002] Titanium dioxide (TiO 2 ) as an N-type semiconductor material with a bandgap width of 3.5eV and good photocatalytic and electrochemical properties. The nano hollow structure has the characteristics of high specific area, low density and strong surface permeability, which makes it have broad application prospects in catalysis, adsorption, lithium ion batteries and drug sustained release. TiO 2 Nano hollow spheres have attracted the attention of scientific and technological personnel in recent years in the fields of lithium ion batteries, solar cells, sensors, especially in photocatalysis. Due to TiO 2 Nano hollow spheres have small particle size and many surface active sites, which can effectively increase the contact area of ​​the catalyst. In addition, th...

Claims

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Application Information

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IPC IPC(8): C01G23/053B82Y40/00B01J21/06C02F1/58C02F1/32C02F103/30
Inventor 张卫新邢洁杨则恒王磊
Owner HEFEI UNIV OF TECH
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