A kind of graphene/titanium dioxide composite material and its preparation method and application
A technology of titanium dioxide and composite materials, applied in the application field of air purification, can solve the problems of reducing the photocatalytic efficiency of composite materials, unable to fully exert adsorption performance, and less research on adsorption and degradation, so as to improve the photocatalytic activity and inhibit the composite material. rate, the effect of increasing the local gas concentration
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[0059] Preparation of Amorphous Titanium Oxide. In one example, amorphous titanium oxide is prepared by liquid phase hydrolysis. Dissolve the organic titanium source in a mixed solution of absolute ethanol and water (preferably deionized water), mix well and continue to react at a certain temperature for a period of time, and then undergo solid-liquid separation (such as centrifugation), washing, and drying to obtain amorphous Titanium oxide particles. The organic titanium source can be at least one of titanium isopropoxide and tetrabutyl titanate. Compared with inorganic titanium sources, organic titanium sources have mild experimental conditions and high experimental safety. The mass ratio of the organic titanium source, absolute ethanol and water can be (1-5): (300-500): (3-10). Under this reaction ratio, the hydrolysis rate of the titanium source is moderate, which is helpful to obtain granular Titanium oxide particles with a diameter of 3 to 50 nm. The reaction temper...
Embodiment 1
[0071] First, 5 g of tetrabutyl titanate was dissolved in 500 g of absolute ethanol, and 4 g of deionized water was added dropwise while stirring, and then placed in an oil bath at 80° C. for 5 hours under reflux. After the resulting product was centrifuged, it was washed three times with ethanol and three times with distilled water to obtain amorphous titanium oxide, which was obtained from the Raman spectrum image 3 It can be seen that titanium oxide is not crystallized and is in an amorphous state. Then the above product was dispersed in 50ml H with 1.46mg graphene oxide 2 Dilute sulfuric acid was added dropwise to the mixed solution of O and 25ml ethanol to adjust the pH to 4. After ultrasonication for 1 hour and stirring for 5 hours, the solution was placed in a hydrothermal kettle for hydrothermal reaction at 150°C for 6 hours. The final product was washed with deionized water and then dried at 50° C. for 2 hours to obtain a graphene / titanium dioxide composite material...
Embodiment 2
[0075] First, 5 g of tetrabutyl titanate was dissolved in 500 g of absolute ethanol, and 4 g of deionized water was added dropwise while stirring, and then placed in an oil bath at 80° C. for 5 hours under reflux. After the obtained product was centrifuged, it was washed three times with ethanol and three times with distilled water to obtain amorphous titanium oxide. Then the above product was dispersed in 50mlH with 5.84mg graphene oxide 2 To the mixed solution of O and 25ml ethanol, dilute sulfuric acid was added dropwise to adjust the pH to 4. After ultrasonication for 1 hour and stirring for 5 hours, the solution was placed in a hydrothermal kettle and reacted at 150°C for 6 hours. The final product was washed with deionized water and then dried at 50° C. for 2 hours to obtain a graphene / titanium dioxide composite material powder, wherein the weight ratio of graphene was 0.5%. The obtained graphene / titanium dioxide composite material includes graphene and titanium dioxide...
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