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Titania nanotube/nanorod microspheres with hierarchical structure and preparation method thereof

A technology of titanium dioxide and nanotubes, applied in the field of titanium dioxide nanotube/nanorod microspheres with hierarchical structure and its preparation, can solve the problems of small specific surface area of ​​microspheres, achieve easy recycling, high catalytic activity, and strong ultraviolet absorption capacity Effect

Inactive Publication Date: 2010-11-24
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

"Journal of the American Chemical Society" (J.Am.Chem.Soc.2008, 130, 11256-11257) reported that graded titanium dioxide microspheres have a good effect in filtering and treating sewage, but the specific surface area of ​​the microspheres is small , only 21.6m 2 / g

Method used

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  • Titania nanotube/nanorod microspheres with hierarchical structure and preparation method thereof
  • Titania nanotube/nanorod microspheres with hierarchical structure and preparation method thereof
  • Titania nanotube/nanorod microspheres with hierarchical structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] First, the titanium dioxide microsphere precursor was synthesized under hydrothermal conditions by a general method: 5.1 g of tetrabutyl titanate was dropped into 75 mL of absolute ethanol under stirring, and then 0.33 mL of concentrated sulfuric acid (98%) and 0.3 mL of dehydrated alcohol were added. Ionized water, put the mixture into a 110mL autoclave with a polytetrafluoroethylene liner, react at 180°C for 4h, naturally cool to room temperature, take it out and filter, dry at 40°C for 5h before use. The precursor is composed of random nanoparticles with a diameter of 4-6 μm; take 0.5g microsphere precursor and put it into 50mL sodium hydroxide solution with a concentration of 10M, stir it magnetically for 0.5h, and put the mixed solution into a volume of 80mL In an autoclave with a polytetrafluoroethylene liner, react at 150°C for 24h, cool naturally to room temperature, take out and filter, wash with deionized water until neutral, and redisperse the product in 600mL...

Embodiment 2

[0032] First synthesize the titanium dioxide microsphere precursor (same as embodiment 1) with general method; Get 0.5g microsphere precursor and put into the sodium hydroxide solution that 50mL concentration is 10M, magnetically stir 0.5h, put the mixed solution into volume In an 80mL autoclave lined with polytetrafluoroethylene, react at 150°C for 24h, cool naturally to room temperature, take out and filter, wash with deionized water until neutral, and redisperse the product in 600mL of dilute hydrochloric acid with a concentration of 0.1M , stirred at room temperature for 12 hours, washed with deionized water until neutral, dried at 40°C for 5 hours, and annealed at 500°C for 1 hour to obtain titanium dioxide nanorod microspheres with a hierarchical structure of anatase phase.

[0033] attached Figure 4 It is the X-ray diffraction pattern of the product obtained in this example, as can be seen from the figure, the product is pure anatase phase TiO 2 . attached Figure 5...

Embodiment 3

[0035]First synthesize titanium dioxide microsphere precursor (same as embodiment 1) with general method; Get 0.5g microsphere precursor and put into 50mL concentration and be 5M sodium hydroxide solution, magnetically stir 0.5h, put mixed solution into volume In an 80mL autoclave lined with polytetrafluoroethylene, react at 180°C for 24h, naturally cool to room temperature, take out and filter, wash with deionized water until neutral, and redisperse the product in 600mL of dilute hydrochloric acid with a concentration of 0.1M , stirred at room temperature for 12 h, washed with deionized water until neutral, dried at 40 ° C for 5 h, and the product was annealed at 400 ° C for 1 h.

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Abstract

The invention discloses titania nanotube / nanorod microspheres with a hierarchical structure and a preparation method thereof. The microspheres are porous spheres formed by intertwining titania nanotubes or nanorods, and are obtained by reacting a titania microsphere precursor in alkali solution, dispersing and washing in diluted acid, and annealing at the temperature of between 400 and 500 DEG C. The microspheres have a three-dimensional hierarchical structure and high specific surface area; and the microspheres have higher ultraviolet absorption capability and high catalytic activity under ultraviolet light because of a hierarchical tubular structure.

Description

technical field [0001] The invention relates to a graded titanium dioxide microsphere, in particular to a graded structure titanium dioxide nanotube / nanorod microsphere and a preparation method thereof, which can be used in the field of environmental protection technology for ultraviolet light degradation of organic pollutants. Background technique [0002] In recent years, environmental pollution has become a serious problem threatening human existence, and the rapidly developed semiconductor photocatalytic oxidation technology has become an effective method to control environmental problems. Among many semiconductor photocatalytic materials, titanium dioxide has been the most widely used photocatalyst due to its strong oxidizing ability, non-toxicity, and stable chemical properties. Due to these excellent properties, titanium dioxide is widely used in many fields such as deodorization, antibacterial, water treatment and air purification. Although titanium dioxide is a wel...

Claims

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Application Information

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IPC IPC(8): C01G23/053B82B3/00B01J21/06
Inventor 张晓阳郑昭科黄柏标秦晓燕
Owner SHANDONG UNIV
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