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Method for preparing titanium dioxide catalyst doped with low-valent titanium and application of titanium dioxide catalyst

A titanium dioxide and catalyst technology, applied in the field of low-valent titanium-doped titanium dioxide catalyst and its preparation, can solve the problems of low photon efficiency and the like, and achieve the effects of good degradation, reducing the forbidden band width and inhibiting recombination

Active Publication Date: 2017-02-15
LIAONING UNIVERSITY
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  • Abstract
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Problems solved by technology

[0003] However, TiO 2 The band gap is wide, and only under the excitation of ultraviolet light with a wavelength less than 387nm, the valence band electrons can jump to the conduction band to form the separation of photogenerated electrons and holes; on the other hand, the rapid recombination of electrons and holes generated by photoexcitation will lead to Light quantum efficiency is very low

Method used

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  • Method for preparing titanium dioxide catalyst doped with low-valent titanium and application of titanium dioxide catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 A kind of low-valent titanium-doped titania catalyst

[0024] Methods as below:

[0025] 1) Activation treatment of zinc powder: Add 5 ml of dilute hydrochloric acid with a concentration of 2% (v / v) to 800 mg of zinc powder, stir for 2 minutes, filter with suction, wash with water, wash with absolute ethanol, and dry in vacuo.

[0026] 2) Dehydration treatment of tetrahydrofuran: Put the 4A molecular sieve into a muffle furnace at 400°C for 3 hours, then cool it down to 100°C naturally, pour it into tetrahydrofuran, keep it warm for 12 hours, and cool it down to room temperature naturally.

[0027] 3) Vacuumize, under vacuum conditions, at room temperature, add 20ml of dehydrated tetrahydrofuran to 200mg of activated zinc powder, stir thoroughly, then add 0.35ml of titanium tetrachloride dropwise to obtain a mixed solution .

[0028] 4) The mixture was heated under reflux at 67° C. for 2 h, and after cooling, 2 g of titanium dioxide was added and stirred ...

Embodiment 2

[0033] Embodiment 2 A kind of low-valent titanium-doped titania catalyst

[0034] Methods as below:

[0035] 1) Activation treatment of zinc powder: Add 5 ml of dilute hydrochloric acid with a concentration of 2% (v / v) to 800 mg of zinc powder, stir for 2 minutes, filter with suction, wash with water, wash with absolute ethanol, and dry in vacuo.

[0036] 2) Dehydration treatment of tetrahydrofuran: put 4A molecular sieves in a muffle furnace at 400°C for 3 hours, then cool naturally to 100°C, pour into tetrahydrofuran, keep warm for 12 hours, and cool naturally to room temperature.

[0037] 3) vacuuming, under vacuum conditions, at room temperature, to 200mg of activated zinc powder, add 20ml of dehydrated tetrahydrofuran and 2g of titanium dioxide, fully stir, then add 0.35ml of titanium tetrachloride dropwise, Get a mixture.

[0038] 4) The mixture was heated under reflux at 67°C for 2 hours, and after cooling, the reactant was obtained.

[0039] 5) The reactant was cent...

Embodiment 3

[0040] Embodiment 3 Application of low-valent titanium-doped titania catalyst

[0041] Method: In 100 ml of rhodamine B solution with a concentration of 5 mol / L, add 0.1 g of low-valent titanium-doped titanium dioxide catalysts prepared in Example 1 with different treatment methods, first stir at room temperature in a darkroom for 30 minutes, and then place the mixture under visible light. Irradiate, stir for 2-3 hours, and measure the absorbance value of the solution every 15 minutes under visible light, and the results are as follows: figure 1 shown.

[0042] Depend on figure 1 It can be seen that with the prolongation of the light time, the maximum absorption peak of rhodamine B gradually decreases. After 2 hours of light, the degradation rate of the dye is: titanium dioxide P25 86.2%, A 90.39%, B 98.41%, C80.57%, low-valent titanium doped After adding titanium dioxide, the degradation rate of the dye was significantly improved, especially for the samples washed with THF ...

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Abstract

The invention relates to a titanium dioxide catalyst doped with low-valent titanium, a method for preparing the titanium dioxide catalyst and application thereof. The method includes uniformly mixing zinc powder and tetrahydrofuran with each other and dropwise adding titanium tetrachloride into the zinc powder and the tetrahydrofuran under stirring conditions to obtain mixed liquid; carrying out heating reflux reaction on the mixed liquid at the temperature of 60-70 DEG C for 2-3 h, cooling reaction products, adding titanium dioxide into the reaction products and stirring the reaction products and the titanium dioxide overnight to obtain reactants; treating the reactants to obtain target products. The titanium dioxide catalyst, the method and the application have the advantages that the TiO2 is doped with the low-valent titanium, accordingly, the method is beneficial to reducing the forbidden bandwidths of the titanium dioxide catalyst which is a TiO2 photocatalyst, and reaction response spectra can be expanded towards the field of visible light; electron-hole recombination can be inhibited to a certain extent, and accordingly the photocatalytic efficiency can be improved.

Description

technical field [0001] The invention relates to the field of titanium dioxide catalysts, in particular to a low-valent titanium-doped titanium dioxide catalyst for improving the photocatalytic degradation performance of rhodamine B-type wastewater dyes and a preparation method thereof. Background technique [0002] Due to the development of industry, a large number of wastewater dyes will pollute the environment. Most of the water purification technologies used in the past are based on the adsorption of toxic substances by activated carbon, which transfers pollutants from one phase to another, causing secondary pollution and post-treatment. trouble. Studies have found that semiconductor oxides as photocatalysts have the advantages of deep reaction at room temperature, no secondary pollution, and direct use of sunlight. At present, the widely studied photocatalytic materials are mainly semiconductor types with large band gaps, such as: TiO 2 , ZnO, SnO 2 , ZnS and CdS, etc....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J23/06C02F1/30
CPCC02F1/30B01J21/063B01J23/06C02F2305/10C02F2101/308B01J35/39
Inventor 于海波夏莹刘笑宇李谷丽
Owner LIAONING UNIVERSITY
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