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Titanium dioxide nanometer catalyst and preparation and application thereof

A nano-catalyst, titanium dioxide technology, applied in the field of materials, can solve the problem of insufficient degradation rate of photocatalyst, achieve the effect of improving redox ability, promoting reaction mass transfer, and large specific surface area

Inactive Publication Date: 2016-07-06
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires the use of high-polymer semi-organic sulfonated coal as a carrier, and three microwave irradiations, and the degradation rate of the obtained TiO2 photocatalyst is not high enough

Method used

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  • Titanium dioxide nanometer catalyst and preparation and application thereof
  • Titanium dioxide nanometer catalyst and preparation and application thereof
  • Titanium dioxide nanometer catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The method for preparing titanium dioxide nano-catalysts assisted by the microwave comprises the following steps:

[0049] (1) Add 1.0 mL of titanyl sulfate dropwise to 100 mL of continuously stirring deionized water to disperse, and at the same time slowly add 1.0 mL of sulfuric acid to adjust the pH to 2;

[0050] (2) Place the mixed solution obtained in step (1) in a microwave reactor under normal pressure for microwave irradiation, the reaction temperature is 80°C, the reaction power is 80W, and the reaction time is 10min. After the reaction is completed, cool to room temperature to obtain milky white suspension;

[0051] (3) The milky white solution obtained in step (2) is centrifuged and washed, and repeatedly centrifuged and washed with deionized water and ethanol until the solution is washed with Ba 2+ SO cannot be detected 4 2- until;

[0052] (4) Vacuum-dry the obtained white precipitate at 50° C. for 12 hours to completely remove moisture;

[0053] (5) P...

Embodiment 2

[0056] The method for preparing titanium dioxide nano-catalysts assisted by the microwave comprises the following steps:

[0057] (1) Add 1.2mL of titanyl sulfate dropwise to 100mL of constantly stirring mixture of ethanol and deionized water to disperse, wherein the volume ratio of ethanol and deionized water is 1:5, and slowly add 2.5mL of acetic acid dropwise to adjust pH is 3.5;

[0058] (2) Place the mixed solution obtained in step (1) in a microwave reactor under normal pressure for microwave irradiation, the reaction temperature is 70°C, the reaction power is 240W, and the reaction time is 30min. After the reaction is completed, cool to room temperature to obtain milky white suspension;

[0059] (3) centrifuging and washing the milky white solution obtained in step (2), and repeatedly centrifuging and washing with deionized water and ethanol to remove the completely reacted solvent;

[0060] (4) Vacuum-dry the obtained white precipitate at 70° C. for 8 hours to comple...

Embodiment 3

[0063] The method for preparing titanium dioxide nano-catalysts assisted by the microwave comprises the following steps:

[0064] (1) Add 15 mL of titanium isopropanol dropwise to 150 mL of continuously stirring ethanol to disperse, at the same time slowly add hydrochloric acid to adjust the pH to 2, stir at room temperature for 2 hours, and obtain TiO 2 Sol;

[0065] (2) TiO obtained in step (1) 2 The sol was placed in a microwave reactor under normal pressure for microwave irradiation, the reaction temperature was 100°C, the reaction power was 160W, and the reaction time was 60min. After the reaction was completed, it was cooled to room temperature to obtain a white precipitate;

[0066] (3) centrifuging and washing the white precipitate obtained in step (2), and repeatedly centrifuging and washing with deionized water until the solution is completely neutralized;

[0067] (4) Vacuum-dry the obtained white precipitate at 50° C. for 12 hours to completely remove moisture; ...

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Abstract

The invention relates to the field of materials, in particular to an adsorption and photocatalysis material for waste gas and wastewater treatment, in particular to a titanium dioxide nanometer catalyst and preparation and application thereof. The method includes the following steps of adjusting pH after mixing titanium dioxide precursor with solvent, conducting microwave irradiation reaction at a temperature of 50-120 DEG C and normal pressure, and conducting cooling, washing, drying and calcining to obtain the titanium dioxide nanometer catalyst. By means of the method, no template additives or auxiliaries are needed, and the catalyst is simple, efficient, green and environmentally friendly; the prepared titanium dioxide nanometer catalyst has active photocatalysis activity, the degradation rate on methylene blue is more than doubled compared with commercial P25, and the catalyst can be well applied to the field of environment pollution abatement.

Description

technical field [0001] The invention relates to the field of materials, in particular to adsorption and photocatalytic materials that can be used for waste gas and wastewater treatment, and in particular to a titanium dioxide nanometer catalyst, its preparation method and application. Background technique [0002] Semiconductor heterogeneous photocatalysis technology has broad application prospects as an efficient treatment method for organic pollutants. Among all kinds of semiconductor photocatalysts, titanium dioxide, as a typical N-type semiconductor, has become the current attention because of its non-toxic, cheap, stable performance, high photocatalytic performance, and non-selective degradation of organic matter in pollutants. And photocatalytic oxidants with broad application prospects. [0003] At present, scientific researchers have developed a variety of preparation methods for nano-titanium dioxide materials, including sol-gel method, water / solvothermal method, g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J20/06C01G23/053B01J20/28B01J35/02B01J35/10B01D53/86C02F1/28C02F1/30B01J35/00
CPCB01D53/8687B01J20/06C01G23/053C02F1/281C02F1/30B01J20/28004B01J20/28007B01J20/28057B01J20/28061B01J20/28071B01J20/28083B01J21/063B01D2255/20707B01J2220/4812B01J2220/4806B01J35/40B01J35/633B01J35/647B01J35/615
Inventor 张锦菊李艳香杨传芳
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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