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Titanium oxide micro-nanotube with visible-light catalysis effect, and preparation method thereof

A catalytic effect, titanium oxide technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as easy agglomeration, reduced photocatalyst activity, and failure to effectively utilize solar visible light, etc. Achieve the effect of scientific preparation method

Inactive Publication Date: 2012-05-16
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, both the obtained titanium dioxide photocatalyst and the preparation method have shortcomings. First, the specific surface area of ​​the titanium dioxide photocatalyst is only 16-45m 2 / g, this too small specific surface area is difficult to fully contact with the degradation product; secondly, the particulate titanium dioxide photocatalyst is easy to agglomerate, which greatly reduces the activity of the photocatalyst; thirdly, the wavelength used in photocatalysis is UV light at 254nm, which fails to efficiently utilize visible light from solar energy; finally, the preparation method is time-consuming and energy-intensive

Method used

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  • Titanium oxide micro-nanotube with visible-light catalysis effect, and preparation method thereof
  • Titanium oxide micro-nanotube with visible-light catalysis effect, and preparation method thereof
  • Titanium oxide micro-nanotube with visible-light catalysis effect, and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] The concrete steps of preparation are:

[0030] Step 1: first mix titanyl sulfate hydrate, methanol and glycerin according to a molar ratio of 1:15:60, and then stir for 1 min to obtain a mixed solution. Then add diethyl ether to the mixed solution and stir for 1 min; wherein, the molar ratio between the diethyl ether and the hydrated titanyl sulfate in the mixed solution is 7:1 to obtain a precursor solution.

[0031] In step 2, first place the precursor solution in an airtight state, react at 105°C for 40 hours, and then cool to room temperature to obtain a gel. Then add ethanol to the gel and stir for 1 min; wherein, the molar ratio between ethanol and hydrated titanyl sulfate in the gel is 20:1 to obtain a gel mixture. Then, the gel mixture was subjected to ultrasonication, centrifugation, washing and drying; wherein, the time of ultrasonic treatment was 2min, the rotational speed of centrifugal treatment was 3500r / min, and the time was 3min. For drying at 75°C fo...

Embodiment 2

[0034] The concrete steps of preparation are:

[0035] Step 1: first mix titanyl sulfate hydrate, methanol and glycerin according to a molar ratio of 1:16:65 and then stir for 2 minutes to obtain a mixed solution. Then add diethyl ether to the mixed solution and then stir for 2 min; wherein, the molar ratio between the diethyl ether and the hydrated titanyl sulfate in the mixed solution is 8:1 to obtain a precursor solution.

[0036] In step 2, first place the precursor solution in an airtight state, react at 108°C for 34 hours, and then cool to room temperature to obtain a gel. Then add ethanol to the gel and stir for 1 min; wherein, the molar ratio between ethanol and hydrated titanyl sulfate in the gel is 23:1 to obtain a gel mixture. Then, the gel mixture was subjected to ultrasonication, centrifugation, washing and drying; wherein, the time of ultrasonic treatment was 3min, the rotational speed of centrifugal treatment was 3800r / min, and the time was 3min, and the washin...

Embodiment 3

[0039] The concrete steps of preparation are:

[0040] Step 1: first mix titanyl sulfate hydrate, methanol and glycerin according to a molar ratio of 1:17.5:70, and then stir for 3 minutes to obtain a mixed solution. Then add diethyl ether to the mixed solution and stir for 3 minutes; wherein, the molar ratio between the diethyl ether and the hydrated titanyl sulfate in the mixed solution is 8.5:1 to obtain a precursor solution.

[0041] In step 2, first place the precursor solution in a closed state, react at 110° C. for 28 hours, and then cool to room temperature to obtain a gel. Then add ethanol to the gel and stir for 1.5 min; wherein, the molar ratio between ethanol and titanyl sulfate hydrate in the gel is 25:1 to obtain a gel mixture. Then, the gel mixture was subjected to ultrasonication, centrifugation, washing and drying; wherein, the time of ultrasonic treatment was 3.5min, the rotational speed of centrifugal treatment was 4000r / min, and the time was 2min. Treatme...

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Abstract

The present invention discloses a titanium oxide micro-nanotube with a visible-light catalysis effect, and a preparation method thereof. The micro-nanotube is tubular titanium dioxide doped with sulfate in situ, the tube wall of the micro-nanotube is attached with nano-sheets formed by nanoparticles, and nano-mesopores are arranged between the nanoparticles. The preparation method comprises: mixing and stirring titanium sulfate hydrate, methanol and glycerol to obtain a mixing solution; then adding ether to the mixing solution, and stirring to obtain a precursor solution; placing the precursor solution in a sealed state, carrying out a reaction for 16-40 hours at a temperature of 105-115 DEG C, and then cooling to the room temperature to obtain a gel material; adding ethanol to the gel material, and stirring to obtain a gel mixture; carrying out treatments of ultrasound, centrifugation, washing and drying for the gel mixture to obtain an intermediate product; placing the intermediate product in the environment with the temperature of 450-550 DEG C to carry out annealing for at least 2 hours to prepare the titanium oxide micro-nanotube with the visible-light catalysis effect. The titanium oxide micro-nanotube of the present invention has significant photocatalytic properties in the ultraviolet region and the visible-light region, and can be widely used for degradation of organic pollutants.

Description

technical field [0001] The invention relates to a micronanotube and a preparation method thereof, in particular to a titanium oxide micronanotube with visible light catalytic effect and a preparation method thereof. Background technique [0002] In recent years, the rapid development of industrial technology has brought great changes to human life. At the same time, the improvement of industrial modernization has seriously damaged the environment in which human beings live. For this reason, the development of chemical pollutant treatment technology with high efficiency, low energy consumption, wide application range and deep oxidation ability has become a research hotspot for environmental protection workers. As one of the semiconductor photocatalysts, nano-titanium dioxide has always attracted the attention of scientific and technological personnel in the field of nanomaterials research because of its excellent photocatalytic performance, as introduced in the Chinese invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/053B01J21/06
Inventor 许思超张云霞李广海
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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