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Method for preparing anatase type nano titanium dioxide photocatalyst

A nano-titanium dioxide, anatase type technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of cumbersome, unfavorable to obtain high photocatalytic activity nano-titanium dioxide, increase equipment investment and other problems , to achieve the effect of improving the yield and shortening the complete hydrolysis time

Inactive Publication Date: 2006-04-26
UNIV OF SCI & TECH LIAONING
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Problems solved by technology

This method increases equipment investment because of using microwave heating. The embodiment uses NaOH as a precipitant, which is not conducive to obtaining nano-titanium dioxide with high photocatalytic activity.
[0010] Patent CN1491897 proposes a method for preparing anatase-type nanocrystalline titanium dioxide with high photocatalytic activity at low temperature. The method includes using hydrated titanium dioxide as the main raw material, undergoing alkaline hydrolysis, cooling, adding a crystal nucleus promoter, washing with water, acid dissolution, cooling, Products with an average particle size in the range of 10-80nm can be obtained through processes such as diafiltration, drying, and crushing, but this method is too cumbersome

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  • Method for preparing anatase type nano titanium dioxide photocatalyst
  • Method for preparing anatase type nano titanium dioxide photocatalyst

Examples

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Embodiment 1

[0035] Prepare the anatase type nano-titanium dioxide photocatalyst according to the following steps:

[0036] (1) preparation concentration is the titanium sulfate aqueous solution of 0.5mol / L, preparation concentration is the ammonia solution of 2.0mol / L,

[0037] (2) Under stirring, the prepared titanium sulfate aqueous solution is heated to boiling, and kept under reflux, so that the titanium sulfate is hydrolyzed rapidly, and the hydrated titanium dioxide crystal nuclei are uniformly produced,

[0038] (3) After the above-mentioned titanium sulfate aqueous solution that has begun to be hydrolyzed boils and refluxes for 40min, stop heating, and cool down naturally,

[0039] (4) When the temperature of the above aqueous solution drops to 80°C, under stirring, add the prepared ammonia solution dropwise, and gradually increase the pH value of the solution to 8.5, so that the titanium sulfate is completely hydrolyzed to form a hydrated titanium dioxide precipitate,

[0040] (5)...

Embodiment 2～ Embodiment 9

[0047] The preparation methods of Examples 2 to 9 are the same as those of Example 1 except that certain preparation conditions are changed. The preparation conditions of Examples 2 to 9 and the characterization of the corresponding products obtained are listed in Table 1.

[0048] The products obtained in Examples 2 to 9 were respectively used as photocatalysts, and methyl orange was used as the degradation target compound. The dosage of the products obtained in Examples 2 to 9 is 0.1g, and 25ml of 20ppm methyl orange solution is processed, and irradiated with a 10W-254nm ultraviolet lamp for 20min. The experimental results are also listed in Table 1.

[0049]

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Abstract

The invention provides a preparation method for nano anatase-type titania photocatalyst, which comprises: heating titanium sulfate solution till boil to hydrolyze and generate hydrated titania crystal nucleus, adjusting upward the pH value with ammonia to boost hydrolysis and make hydrated titania grow evenly; depositing fully, separating, cleaning, drying, and calcining at 300-600Deg. This process needs low cost and short time, and has high yield without pollution. The product has 5-25nm primary grain size, can degrade organic pollutant in water high efficiently, and can recycle for usage.

Description

technical field [0001] The invention belongs to the field of fine chemical industry, in particular to a preparation method of anatase nano-titanium dioxide photocatalyst. technical background [0002] At present, the world urgently needs to develop new organic pollutant wastewater treatment technology to ensure the sustainable development of the environment on which human beings depend. The titanium oxide photodegradation technology that people have invested a lot of energy in research is expected to become a new technology for organic pollutant wastewater treatment. [0003] Titanium dioxide has three crystal forms, namely anatase type, rutile type and brookite type, among which the anatase type has the strongest photocatalytic activity, and this activity increases significantly with the decrease of particle size. [0004] The sulfuric acid method is a common method for preparing anatase titanium dioxide in industry [Tang Zhenning. Production and Environmental Treatment of ...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J37/03
Inventor 王绍艳李晓安吕跃东耿新杜英春任姿蓉
Owner UNIV OF SCI & TECH LIAONING
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