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Preparation method for nano titanium dioxide with high visible light catalytic activity and water dispersion thereof

A nano-titanium dioxide, catalytic activity technology, applied in titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide and other directions, can solve the problems of low visible light catalytic activity of nano-titanium dioxide, poor industrial realization, complex preparation methods, etc., and achieve dilution good performance, low cost and simple preparation process

Active Publication Date: 2013-03-20
HANGZHOU WANJING NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problem that the existing nano-titanium dioxide preparation method has high production cost and the obtained nano-titanium dioxide has low visible light catalytic activity, and provides a kind of nano-titanium dioxide with low production cost, easy operation and high visible light catalytic activity. Preparation method of nano titanium dioxide
[0007] Another object of the present invention is to solve the technical problem that the preparation method of the existing nano-titanium dioxide aqueous dispersion is relatively complicated and the industrial realization is poor, and a kind of preparation method of the nano-titanium dioxide aqueous dispersion is provided, which can be used without adding any In the case of surfactants, it is easy to prepare an aqueous dispersion with a solid content of more than 50%, with good dilution and storage stability

Method used

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  • Preparation method for nano titanium dioxide with high visible light catalytic activity and water dispersion thereof
  • Preparation method for nano titanium dioxide with high visible light catalytic activity and water dispersion thereof
  • Preparation method for nano titanium dioxide with high visible light catalytic activity and water dispersion thereof

Examples

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Effect test

Embodiment 1

[0044] Step ①: Add methanol to the titanium tetrachloride aqueous solution with a mass concentration of 90%, and form a sol system after uniform mixing. The amount of titanium in the sol system is 0.1 mol / liter; the titanium tetrachloride aqueous solution is composed of titanium tetrachloride and Ionized water is formulated;

[0045] Step ②: Add the sol system obtained in step ① into absolute ethanol and mix evenly, and then conduct a low-temperature heat treatment at 100°C for 24 hours. The weight ratio of the sol system to absolute ethanol is 1:2;

[0046] Step ③: After the low-temperature heat treatment is completed, centrifuge repeatedly at 5000rmp 5 times to obtain the product, wash the product 5 times with absolute ethanol, and perform centrifugation and washing at the same time, and dry the washed product at 60°C for 20 hours to obtain nano-titanium dioxide .

Embodiment 2

[0048] Step ①: Add acetone to the titanyl sulfate aqueous solution with a mass concentration of 98%, and mix uniformly to form a sol system. The amount of titanium in the sol system is 1.2 mol / liter; the titanyl sulfate aqueous solution comes from the industrial Titanyl sulfate solution, industrial titanyl sulfate solution can be used after concentration, using industrial titanyl sulfate solution, low cost, energy saving and environmental protection;

[0049] Step ②: Add the sol system obtained in step ① into anhydrous acetone and mix evenly, and then perform a low-temperature heat treatment at 200°C for 5 hours. The weight ratio of the sol system to anhydrous acetone is 1:9;

[0050] Step ③: After the low-temperature heat treatment is completed, centrifuge repeatedly at 10000rmp 3 times to obtain the product, wash the product 3 times with anhydrous acetone, centrifuge and wash at the same time, and dry the washed product at 150°C for 8 hours to obtain nano-titanium dioxide . ...

Embodiment 3

[0052] Step ①: Add ethanol to the titanium sulfate aqueous solution with a mass concentration of 95%, and mix evenly to form a sol system. The amount of titanium in the sol system is 0.8 mol / liter; the titanium sulfate aqueous solution is formed by mixing titanium sulfate and deionized water ;

[0053] Step ②: Add the sol system obtained in step ① into anhydrous n-propanol and mix evenly, and then conduct a low-temperature heat treatment at 150°C for 15 hours. The weight ratio of the sol system to anhydrous n-propanol is 1:5;

[0054] Step ③: After the low-temperature heat treatment is completed, centrifuge repeatedly at 7000rmp 4 times to obtain the product, wash the product 4 times with absolute ethanol, and perform centrifugation and washing at the same time, and dry the washed product at 100°C for 15 hours to obtain nano-titanium dioxide .

[0055] Preparation of Nano Titanium Dioxide Aqueous Dispersion with High Visible Light Catalytic Activity:

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Abstract

The invention discloses preparation methods for nano titanium dioxide with a high visible light catalytic activity and a water dispersion thereof, aiming at solving the technical problems that production cost is high, the visible light activity of the prepared nano titanium dioxide is low and the like in the existing preparation methods for the nano titanium dioxide and the water dispersion thereof. The preparation method for the nano titanium dioxide comprises the steps such as sol system formation, low-temperature thermal treatment on an anhydrous solvent, drying and the like. According to the invention, the whole preparation process is simple and can be carried out at low temperature, the yield is high, subsequent treatments are simple, amplification effect influence is small, scale production can be achieved, and the prepared nano titanium dioxide has the high visible light catalytic activity and can be easily dispersed in water under the condition of not adding any organic surfactant; and the solid content of the water dispersing liquid can be up to above 50%, dilution efficiency is good, and storage can stably reach 3-6 months.

Description

technical field [0001] The invention relates to the technical field of nanomaterial production, in particular to a preparation method of nano titanium dioxide with high visible light catalytic activity and its aqueous dispersion. Background technique [0002] In 1972, Fujishima et al. in Japan discovered that a titanium dioxide single crystal electrode generates an electromotive force under the irradiation of a xenon lamp, and electrolyzes water to generate hydrogen, indicating that nano-titanium dioxide can convert light energy into chemical energy stored in hydrogen. Since then, nano-titanium dioxide has received increasing attention as a new type of photocatalytic material. With the deepening of nanoscience research and the rapid development of nano-application technology, nano-titanium dioxide, especially anatase nano-titanium dioxide, has shown more and more advantages. At present, it can be used as an effective new photocatalyst, anti-ultraviolet agent, photoelectric ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053B01J21/06
Inventor 苏岚徐进张礼知
Owner HANGZHOU WANJING NEW MATERIAL