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A method for preparing nano-titanium dioxide with controllable particle size

A technology of nano-titanium dioxide and particle size, which is applied in the field of photocatalytic materials, can solve the problems of poor photocatalytic degradation activity, mixed crystal particle size, complex process, etc., and achieve stable photocatalytic effect, good stability and simple process.

Active Publication Date: 2018-11-06
陕西瑞科新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing preparation methods of titanium dioxide powder, such as traditional solid-state reaction and sintering method and modern chemical vapor deposition method, physical vapor deposition method, chemical vapor infiltration method, sol-gel method, etc., these methods have complex processes, The disadvantage of high cost is that the resulting mixed crystal form and uneven particle size are often obtained, because the photocatalytic degradation activity of rutile titanium dioxide and amorphous titanium dioxide is very poor

Method used

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  • A method for preparing nano-titanium dioxide with controllable particle size

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Embodiment 1

[0025] A method for preparing nano-titanium dioxide with controllable particle size, the specific steps are as follows:

[0026] Step 1, adding n-butyl titanate to absolute ethanol, then adding polyvinylpyrrolidone, stirring evenly, sealing and reacting for 2 hours, and cooling naturally;

[0027] In step 2, the reaction solution in step 1 is subjected to a vacuum distillation reaction to obtain a light yellow sol;

[0028] Step 3, the sol solution is soaked and washed with ethanol, then ultrasonically reacted in a water bath for 10 minutes, cooled naturally and then distilled under reduced pressure to form a white semi-gel;

[0029] Step 4, add the white semi-gel into n-heptane and stir evenly, then seal and reflux for 2 hours to obtain a milky white suspension;

[0030] In step 5, after filtering the milky white suspension, micro-current electrolysis treatment and light treatment are performed to obtain anatase titanium dioxide.

[0031] The addition of absolute ethanol in...

Embodiment 2

[0039] A method for preparing nano-titanium dioxide with controllable particle size, the specific steps are as follows:

[0040] Step 1, adding n-butyl titanate to absolute ethanol, then adding polyvinylpyrrolidone, stirring evenly, sealing and reacting for 5 hours, and cooling naturally;

[0041] In step 2, the reaction solution in step 1 is subjected to a vacuum distillation reaction to obtain a light yellow sol;

[0042] Step 3, the sol solution is soaked and washed with ethanol, then ultrasonically reacted in a water bath for 15 minutes, cooled naturally and then distilled under reduced pressure to form a white semi-gel;

[0043] Step 4, add the white semi-gel into n-heptane and stir evenly, then seal and reflux for 5 hours to obtain a milky white suspension;

[0044] In step 5, after filtering the milky white suspension, micro-current electrolysis treatment and light treatment are performed to obtain anatase titanium dioxide.

[0045] The addition of absolute ethanol in...

Embodiment 3

[0053] A method for preparing nano-titanium dioxide with controllable particle size, the specific steps are as follows:

[0054] Step 1, adding n-butyl titanate to absolute ethanol, then adding polyvinylpyrrolidone, stirring evenly, sealing and reacting for 3 hours, and cooling naturally;

[0055] In step 2, the reaction solution in step 1 is subjected to a vacuum distillation reaction to obtain a light yellow sol;

[0056] Step 3, the sol solution is soaked and washed with ethanol, then ultrasonically reacted in a water bath for 13 minutes, cooled naturally and then distilled under reduced pressure to form a white semi-gel;

[0057] Step 4, add the white semi-gel into n-heptane and stir evenly, then seal and reflux for 4 hours to obtain a milky white suspension;

[0058] In step 5, after filtering the milky white suspension, micro-current electrolysis treatment and light treatment are performed to obtain anatase titanium dioxide.

[0059] The addition of absolute ethanol in...

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Abstract

The invention discloses a preparation method of particle-size-controllable nano titanium dioxide. The method comprises the steps of enabling polyvinylpyrrolidone and tetrabutyl titanate to have a sealed reaction, and then enabling the product and water bath to have a ultrosonic reaction to obtain white semigel; then, adding n-heptane into the semigel for carrying out a heating reflux reaction so as to obtain milk white suspension; finally, treating the milk white suspension by using microcurrent and light for twice so as to obtain excited state of anatase titanium dioxide. The particle sizes of the titanium dioxide prepared by the method can be controlled by controlling the ratio of the tetrabutyl titanate to the polyvinylpyrrolidone, and the particle sizes of the titanium dioxide are guaranteed by the covering effect of the polyvinylpyrrolidone; furthermore, the particle sizes of the titanium dioxide are uniform in distribution, so that the nano titanium dioxide is obvious in photocatalytic performance and good in electrochemical corrosion resistance effect.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a method for preparing nano titanium dioxide with controllable particle size. Background technique [0002] TiO as one of semiconductor photocatalysts 2 Photocatalytic materials are currently the most researched new type of environmentally friendly materials, and the properties of photocatalysts are the key factors in the photocatalytic oxidation process. TiO 2 The crystal form, grain size and particle diameter, surface state and other factors have a great influence on its photocatalytic performance. Nanoparticles with large surface area have good catalytic activity and selectivity due to their surface effect and volume effect. Nano-TiO 2 Due to its quantum size effect, the conduction band and valence band energy levels become discrete energy levels, the energy gap widens, the conduction band potential becomes more negative, and the valence band p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053C02F1/30B01J21/06B82Y40/00C02F101/36C02F101/38
CPCB01J21/063B01J35/004B01J35/023C01G23/053C01P2004/03C01P2004/62C01P2004/64C02F1/30C02F2101/36C02F2101/38C02F2101/40C02F2305/08C02F2305/10
Inventor 吴亚良
Owner 陕西瑞科新材料股份有限公司
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