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A kind of nano flake spherical anatase titanium dioxide and preparation method thereof

A nano-flaky, titanium dioxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of damage to the spherical structure and increase the cost, and achieve the effect of improved photocatalytic performance, excellent performance and simple operation method.

Inactive Publication Date: 2014-10-29
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods need to remove templates, surfactants or organic solvents after synthesis, which may damage the structure of the beads, or introduce impurities into the product, increasing the cost

Method used

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  • A kind of nano flake spherical anatase titanium dioxide and preparation method thereof
  • A kind of nano flake spherical anatase titanium dioxide and preparation method thereof
  • A kind of nano flake spherical anatase titanium dioxide and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0032] Under magnetic stirring, 0.38g of water and 0.2g of fluorosilicic acid (H 2 SiF 6 ) mixed solution slowly drop into 4.98g butyl titanate (TBOT), the obtained molar ratio is 1TBOT:0.1H 2 SiF 6 : 1.5H 2 O, after stirring for 30 minutes, move it into the polytetrafluoroethylene lining of a 50mL stainless steel kettle, put it into a 180°C oven for crystallization for 72 hours, and then cool it down to room temperature naturally. The samples were washed with ethanol and deionized water, filtered with suction, and dried in an oven at 50°C for 12 hours. The obtained sample is nano-flaky spherical anatase titanium dioxide, and the sample is denoted as A3, and then the sample A3 is calcined at 600° C. for 2 hours. The average diameter of sample A3 after crystallization is 4.5um ( image 3 Left), the surface of the spheroid is composed of nanosheet-like ten-sided bipyramids with truncated double tops ( image 3 Right), and by calculation, the exposure rate of the high-energ...

example 2-4

[0034] The experiment was carried out with the same method as in Example 1, changing the crystallization temperature and time to 24h, 48h, and 96h, and the obtained samples were nano-flaky spherical anatase titanium dioxide, and the samples were respectively marked as A1, A2, and A4. Characterization by X-ray diffraction shows that the crystallinity increases significantly with the increase of crystallization time, but the crystallinity of sample A4 decreases slightly when the crystallization time increases to 96h ( figure 2 ).

example 5-6

[0036] The experiment was carried out with the same method as Example 1, and the crystallization temperature was changed to 160 and 200° C., and the obtained samples were nano-flaky spherical anatase titanium dioxide, and the samples were respectively marked as A5 and A6. Characterization by X-ray diffraction shows that with the increase of temperature, the crystallinity is slightly enhanced, but not obvious.

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Abstract

The invention relates to nano flaky spherical anatase titanium dioxide. The nano flaky spherical anatase titanium dioxide comprises 4-10 mu m of spherical anatase titanium dioxide (TiO2) which is self-assembled by a nanosheet with a particle diameter of 20-50nm and a thickness of 5-10nm, and the nanosheet forming the spherical titanium dioxide exposes a crystal surface (001) with high reaction activity. A preparation method of the nano flaky spherical anatase titanium dioxide comprises the following steps: mixing titanium source, fluorosilicic acid and water in proportions to prepare a synthetic solution; carrying out a crystallization reaction in a reaction kettle for 24-96 hours at 160-200 DEG C; washing, drying or roasting a synthesized sample to obtain the nano flaky spherical anatase titanium dioxide. No template agent or organic additive is added into a microsphere preparing process, and the direct hydro-thermal synthetic method is simple and easy. The titanium dioxide prepared by the invention has better photocatalytic performance, the activity of titanium dioxide photocatalytically degrading an organic pollutant of methyl orange is higher than the photocatalytic activity of titanium dioxide P25, and the micron-sized spheres are unlikely to agglomerate, and are easy to recycle and reuse.

Description

technical field [0001] The invention relates to a titanium dioxide material and a preparation method thereof, in particular to a nanosheet spherical anatase titanium dioxide and a preparation method thereof. Background technique [0002] TiO 2 As a semiconductor material, due to its low cost, good chemical stability, and non-toxicity, it shows good application prospects in two aspects of energy and environment. TiO in three crystal forms 2 Among them, the coloring power of rutile is better than that of anatase phase, and it is widely used in coatings, cosmetics, and paints; while the photocatalytic activity of anatase is better than that of rutile phase, and it is widely used in photocells / solar cells, photoelectric Catalysis, smart surface coatings and sensors, etc. Anatase TiO 2 The photocatalytic effect is not only affected by the atomic structure of the surface, but also by the size, shape, crystallinity and exposure of active crystal planes. The crystal structure o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
Inventor 张利雄杨柳柳曾昌凤王重庆
Owner NANJING TECH UNIV
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