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Method for preparing TiO2/SiO2 aerogel microsphere

An aerogel and microsphere technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of long production cycle, complex preparation process operation, high cost, and reduce product cost. , the effect of wide source of raw materials and low cost

Inactive Publication Date: 2006-11-29
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiO2 reported by Pang Yingcong, Gan Lihua, etc. 2 / SiO 2 Preparation of airgel microspheres (‘TiO 2 / SiO 2 Preparation and characterization of airgel microspheres', Acta Physicochemical Sinica, 2005, 21(12): 1363-1367), this TiO 2 / SiO 2 The preparation of airgel microspheres requires a series of processes such as ethanol solvent exchange for 48 hours and immersion in ethanol solution of ethyl orthosilicate for 48 hours in the drying process, so the preparation process is more complicated, the production cycle is long, and the cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 16 g of 98% TiOSO 4 Add to 500mL deionized water, stir to dissolve completely. Under stirring, 7% (mass fraction) ammonia water was added dropwise until the pH value of the solution was 7-8. At this time, titanyl sulfate is first hydrolyzed to form metatitanic acid, and then further reacted to form TiO 2 precipitation. Wash the resulting precipitate thoroughly with deionized water until there is no SO in the wash 4 2-until the ion is detected. Add 70mL of deionized water to the washed precipitate to disperse, and then add 31mL of 1.6mol L -1 Nitric acid, stirred at 60°C for 15 hours to get TiO 2 Sol.

[0027] Get 25% (mass fraction) silica sol, add 5% (mass fraction) nitric acid, add industrial absolute ethanol under stirring conditions, and obtain SiO 2 Alcohol sol, wherein silica sol, ethanol, and 5% nitric acid solution are measured according to the volume ratio of V (silica sol): V (ethanol): V (5% nitric acid) = 1.0: 1.0: 0.5.

[0028] The above TiO ...

Embodiment 2

[0032] Weigh 16 g of 98% TiOSO 4 Add to 500mL deionized water, stir to dissolve completely. Add 7% (mass fraction) ammonia water dropwise under stirring until the pH value of the solution is 7-8. At this time, titanyl sulfate is first hydrolyzed to form metatitanic acid, and then further reacted to form TiO 2 precipitation. Wash the resulting precipitate thoroughly with deionized water until there is no SO in the wash 4 2- until the ion is detected. Add 70mL of deionized water to the washed precipitate to disperse, and then add 31mL of 1.6mol L -1 Nitric acid, stirred at 75°C for 10 hours to get TiO 2 Sol.

[0033] Get 25% (mass fraction) silica sol, add 5% (mass fraction) nitric acid, add industrial absolute alcohol under stirring condition and make SiO 2 Alcohol sol, wherein silica sol, ethanol, and 5% nitric acid aqueous solution are measured according to the ratio of V (silica sol): V (ethanol): V (5% nitric acid) = 1.0: 3.0: 1.2 by volume.

[0034] The above TiO ...

Embodiment 3

[0038] Weigh 16 g of 98% TiOSO 4 Add to 500mL deionized water, stir to dissolve completely. Add 7% (mass fraction) ammonia water dropwise under stirring until the pH value of the solution is 7-8. At this time, titanyl sulfate is first hydrolyzed to form metatitanic acid, and then further reacted to form TiO 2 precipitation. Wash the resulting precipitate thoroughly with deionized water until there is no SO in the wash 4 2- until the ion is detected. Add 70mL of deionized water to the washed precipitate to disperse, and then add 31mL of 1.6mol L -1 Nitric acid solution, stirred at 80°C for 8 hours to get TiO 2 Sol.

[0039] Get 25% (mass fraction) silica sol, add 5% (mass fraction) nitric acid, add dehydrated alcohol under stirring condition and make SiO 2 Alcohol sol, wherein silica sol, ethanol, and 5% nitric acid aqueous solution are measured according to the ratio of V (silica sol): V (ethanol): V (5% nitric acid) = 1.0: 5.0: 2.0 by volume.

[0040] The above TiO ...

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PUM

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Abstract

A process for preparing microspheres of TiO2 / SiO2, aerogel includes such steps as dissolving TiOSO4 in deionized water, adding ammonia water to make pH=7-8, depositing, washing deposit, adding nitric acid, stirring to obtain TiO2 sol, mixing Si sol with nitric acid, adding alcohol to obtain SiO2 alcohol sol, mixing it with said TiO2 sol, adding formamide and epoxy propane, mixing to obtain TiO2 / SiO2 sol, mixing heptane or hexane, Span-80, tween-85 and butanol or hexanol, stirring to obtain oil phase, adding TiO2 / SiO2 sol, adding ammonia water to make pH=7-1, centrifugal separation of target microspheres, washing and drying.

Description

technical field [0001] The invention relates to a method for preparing TiO 2 / SiO 2 A new approach to airgel microspheres. Prepare TiO with the method of the present invention 2 / SiO 2 Airgel microspheres have the advantages of simple and easy process control and low cost. Background technique [0002] TiO 2 Due to its high specific surface area and strong adsorption, airgel has a higher photocatalytic activity than TiO 2 Thin films and powders are higher and have attracted the attention of industry insiders. TiO 2 / SiO 2 When airgel is used as a photocatalyst due to the introduction of SiO 2 The colloidal particles have significantly improved the specific surface area, transparency, thermal stability and skeletal strength, so it has significantly better activity in the photocatalytic treatment of cyanide, pyridine and phenol pollutants in the liquid phase. than ordinary TiO 2 airgel. However, the currently prepared TiO 2 / SiO 2 Aeroge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06
Inventor 甘礼华刘明贤庞颖聪陈龙武
Owner TONGJI UNIV
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