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Method for preparing nano titanium dioxide photocatalyst and its product

A nano-titanium dioxide, photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, catalyst activation/preparation and other directions, can solve the problems of complex heat treatment process, difficult industrialized production, high production cost, etc., and achieves easy preparation process. The effect of control, clever coating and low production cost

Inactive Publication Date: 2007-01-10
范莉 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, although the synthesis and post-treatment process of nano-titanium dioxide have been improved, high-temperature calcination, roasting, and heat treatment can easily cause rigid agglomeration between nano-titanium dioxide particles. Even if mechanical energy is applied, it will inevitably be difficult to disperse in future use. In addition, , high-temperature calcination, roasting, and heat treatment processes are complicated, the production cost is high, and it is difficult to organize industrialized production

Method used

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  • Method for preparing nano titanium dioxide photocatalyst and its product
  • Method for preparing nano titanium dioxide photocatalyst and its product
  • Method for preparing nano titanium dioxide photocatalyst and its product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Features: Select S element as the inner doping element, calcium phosphate as the outer coating compound

[0036] ①. Add 550ml of distilled water dropwise to 500ml of titanium tetrachloride at a certain speed, and the titanium tetrachloride is slowly hydrolyzed into an orange-yellow transparent liquid;

[0037] 2. Add 8g of polyvinyl alcohol to the orange-yellow transparent liquid formed in step 1, keep the temperature at 70°C and stir for 1 hour;

[0038] ③. Slowly drop 1 gram of sulfuric acid into the liquid formed in step 2, slowly stir for 1 hour, and keep the temperature at 50 °C;

[0039] ④. Add the liquid formed in step 3 into 1050ml of distilled water at 75°C, and stir at a certain speed at the same time. After white crystals are formed, keep the temperature of 90°C, continue to stir and ripen for 2 hours;

[0040] ⑤. Use 25% (W / W) sodium bicarbonate titration to adjust the pH of the liquid formed in step 4 to 7, then add 100 ml of 4% (W / W) calcium chloride solu...

Embodiment 2

[0045] Features: Sn is used as the inner doping element, and alumina is used as the outer cladding compound.

example 2

[0046] The difference between the preparation process of Example 2 and Example 1 is that the elements selected for the doping treatment in step 3 are different, the surface outer covering formed in step 5 is different, and the rest are the same;

[0047] Steps ① and ② are omitted;

[0048]Step 3. Under the condition of slow stirring, slowly drop 50ML of SnCL with a concentration of 0.4% into the liquid formed in step 2, keep the temperature at 60°C, and stir for 2 hours;

[0049] Step ④ is omitted;

[0050] Step 5. Use 25% (w / w) sodium bicarbonate titration to adjust the pH of the reactant formed in step 4 to 7.5, and then add 200 ml of 5% (w / w) sodium aluminate solution, 5% (w / w) 200ml of dilute sulfuric acid solution of 200ml, stir at a constant speed, properly heat and keep the temperature at 100℃ for 1 hour, the surface of the white crystal forms an alumina coating;

[0051] Step ⑥⑦ is omitted;

[0052] After the steps ①-⑦, what is obtained in Example 2 is an anatase na...

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Abstract

This invention provides a method and a product for modulating and preparing optical catalyst of nm TiO2 taking TiCL4 as the raw material to realize inside dope of lattices and outside cover at the surface by secondary hydrolyzation, in which the catalyst prepared in this method is the acute Ti type or crystal-mixed type, the particle size is <=20nm, no hard agglomeration, scattering property is excellent and the light catalyzing efficiency is high radiated by ultraviolet light, visual light or glimmer.

Description

technical field [0001] The present invention relates to a method for preparing nano-titanium dioxide, and more particularly, the present invention relates to a method for preparing nanometer titanium dioxide by using titanium tetrachloride as a raw material and realizing the regulation of doping in the lattice and overcoating on the surface through secondary hydrolysis. A method of titanium dioxide photocatalyst. The present invention also relates to anatase or mixed crystal nano-titanium dioxide photocatalyst with particle size ≤20nm, no rigid agglomeration, excellent dispersibility, and the excitation light source is ultraviolet light, visible light and low light. Background technique [0002] As we all know, nano-titanium dioxide is the most promising photocatalyst. However, in order to make nano-titanium dioxide a truly high-efficiency photocatalyst with practical value, its excitation light source must be broadened from ultraviolet light to visible light and low light,...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J37/03
Inventor 范莉冒巍巍孙恺黄德音
Owner 范莉
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