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Method for preparing fluorine and tungste co-doped anatase type nano titanium dioxide composite powder

A nano-titanium dioxide, anatase-type technology, applied in chemical instruments and methods, catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of preparation methods and performance research, charge loading Problems such as fast flow rate recombination and low solar energy utilization rate achieve the effect of simple and feasible preparation process, easy mass production and low cost

Inactive Publication Date: 2011-07-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However TiO 2 There are still some problems to be solved in practical application: (1) Nano-TiO 2 The solar energy utilization efficiency is low due to TiO 2 It has its own limitations, the bandgap width is about 3.2ev, excitation and generation of electron-hole pairs requires ultraviolet light or near ultraviolet light, the corresponding threshold value of absorbed light is 387.5nm, and the ultraviolet part only accounts for about 5%; (2) The recombination rate of charge carriers is very fast, and the quantum yield is very low, about 4
[0012] But so far, there is no report on the preparation method and properties of fluorine-tungsten co-doped anatase nano-titanium dioxide.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 Shown, the preparation method of fluorine-tungsten co-doped anatase type nano-titanium dioxide composite powder, it comprises the steps:

[0038] 1) First mix 200mL of absolute ethanol and 5mL of acetic acid (concentration: 99.5wt.%) and stir well (obtain a mixed solution, which is a colorless solution); take 20mL of butyl titanate Ti(OC 4 h 9 ) 4 (content: 99.9wt.%) was slowly dropped into the above mixed solution, and the stirring was continued for 60 minutes during this process to obtain a light yellow sol;

[0039] 2) Preparation of tungsten fluoride solution: first dissolve 0.1mL of HF (concentration: 40wt.%) in 5ml of deionized water to make HF aqueous solution, then weigh 85mg of ammonium tungstate [(NH 4 ) 6 W 7 o 24 ·6H 2 O, the content is 98wt.%], dissolving ammonium tungstate in the above aqueous HF solution, stirring it to fully react with the aqueous HF solution (heating temperature is 70°C), recorded as F-W-H 2 O;

[0040] 3) Aft...

Embodiment 2

[0045] A preparation method for fluorine-tungsten co-doped anatase nano-titanium dioxide composite powder, which comprises the following steps:

[0046] 1) First mix 200mL of absolute ethanol and 5mL of acetic acid (concentration: 98wt.%) and stir evenly (to obtain the mixed solution, which is a colorless solution); take 20mL of butyl titanate Ti(OC 4 h 9 ) 4 (content is 98wt.%) slowly drop into the above mixed solution, and keep stirring for 30 minutes during this process to obtain light yellow sol;

[0047] 2) Preparation of tungsten fluoride solution: first dissolve 0.15mL of HF (concentration: 40wt.%) in 5mL of deionized water to make HF aqueous solution, then weigh 170mg of ammonium tungstate [(NH 4 ) 6 W 7 o 24 ·6H 2 O, the content is 85wt.%], dissolve it in the above-mentioned HF aqueous solution, stir to make it fully react with the HF aqueous solution (heating temperature is 45°C), and record it as F-W-H 2 O;

[0048] 3) After obtaining light yellow sol, F-W-H...

Embodiment 3

[0053] A preparation method for fluorine-tungsten co-doped anatase nano-titanium dioxide composite powder, which comprises the following steps:

[0054] 1) First mix 200mL of absolute ethanol and 5mL of acetic acid (99wt.%) and stir well (to obtain the mixed solution, which is a colorless solution); take 20mL of butyl titanate Ti(OC 4 h 9 ) 4 Slowly drop into the above mixed solution, and keep stirring for 40 minutes during this process to obtain a light yellow sol;

[0055] 2) Preparation of fluorine tungsten solution: first dissolve 0.1mL of HF (concentration: 40wt.%) in 5mL of deionized water to make HF aqueous solution, then weigh 340mg of ammonium tungstate ((NH 4 ) 6 W 7 o24 ·6H 2 O), dissolving ammonium tungstate in the above-mentioned HF aqueous solution, stirring it to fully react with the HF aqueous solution (heating temperature is 60°C), denoted as F-W-H 2 O;

[0056] 3) After obtaining light yellow sol, F-W-H 2 O was added dropwise in the light yellow sol, ...

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Abstract

The invention relates to a method for preparing fluorine and tungste co-doped anatase type nano titanium dioxide composite powder, which is characterized by comprising the following steps: 1) preparing butyl titanate, absolute ethanol, acetic acid, HF, deionized water and ammonium tungstate according to a ratio of 20mL:200mL:5mL:(0.1 to 0.15mL):5mL:(85-340g), mixing and uniformly stirring the absolute ethanol and the acetic acid to obtain mixed liquid and dripping the butyl titanate into the mixed liquid to obtain yellowish sol; 2) preparing solution of fluorine and tungsten; 3) adding F-W-H2O into the yellowish sol to obtain milky sol, and standing the milky sol for 2 to 3 days; and 4) washing the milky sol which is stood for 2 to 3 days with deionized water till the pH value is 7, filtering to obtain a precipitate and drying to obtain the fluorine and tungste co-doped anatase type nano titanium dioxide composite powder. The method has the characteristics of low cost and simple preparation process and can realize batch production, and the prepared fluorine and tungste co-doped anatase type nano titanium dioxide composite powder has the characteristics of high catalytic activity and the like.

Description

technical field [0001] The invention relates to a preparation method of fluorine-tungsten co-doped anatase nano-titanium dioxide composite powder. Background technique [0002] TiO 2 As a durable photocatalyst, it has been widely used in the treatment of various sewage, and its degradation targets involve various organic compounds and some inorganic substances such as phenols and dyes. Harada Keni et al. (K.Harada, et al.Water Res., 24(1990) 1415-1417.) conducted a systematic study on the photocatalytic degradation of 34 organic pollutants in water, showing that photocatalysis can decompose hydrocarbons in water , halogenated substances, surfactants, dyes, nitrogen-containing organic compounds and phosphorus-containing pesticides, etc. are quickly and completely oxidized to CO 2 、H 2 O and other harmless substances. In addition, nano-titanium dioxide photocatalysts have applications in the treatment of inorganic pollutants, air purification and antibacterial aspects. Wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J23/30B01J27/06B01J37/03
Inventor 史晓亮秦海波章桥新冯四平彭美超祝志伟王莽
Owner WUHAN UNIV OF TECH
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