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Graphene/titanate nanometer composite visible-light activated photocatalyst and preparation method thereof

A nanocomposite and photocatalyst technology, applied in the field of nanocomposite materials and photocatalysis, to achieve the effects of good surface morphology, enhanced visible light catalytic performance, and large specific surface area

Inactive Publication Date: 2013-01-02
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] From the above literature research, it can be found that although there have been reports on the preparation of strontium titanate, barium titanate and calcium titanate with various structures by hydrothermal method using different raw materials, the oxyhydroxide precursors of graphene oxide, nitrate and titanium As a reactant, the preparation of graphene / titanate nanocomposite visible light catalysts by nanocomposite technology under hydrothermal conditions has not been reported

Method used

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  • Graphene/titanate nanometer composite visible-light activated photocatalyst and preparation method thereof
  • Graphene/titanate nanometer composite visible-light activated photocatalyst and preparation method thereof
  • Graphene/titanate nanometer composite visible-light activated photocatalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032]Dissolve 2.55 mL of tetrabutyl titanate in 20 mL of absolute ethanol, add ammonia solution while stirring, filter and wash to obtain precipitates of titanium oxyhydroxides. Dissolve 4.76 g of barium nitrate and 2.1 g of potassium hydroxide in 10 mL of deionized water, respectively. 20 mg graphene oxide was sonicated in 20 mL deionized water for 3 hours, then barium nitrate aqueous solution was added and stirred for another 8 hours. Mix and stir the titanium oxyhydroxide precipitation, barium nitrate and graphene oxide solution for 30 minutes, then add potassium hydroxide aqueous solution and stir for 10 minutes, then transfer to a 100 mL reactor liner, and adjust the reaction with deionized water The volume of the reaction material in the inner tank of the reactor reached 75% of the inner tank volume of the reactor, and then placed in a stainless steel jacket, sealed, and kept at 120°C for 10 hours for hydrothermal treatment, and then allowed the reactor to cool naturall...

Embodiment 2

[0034] Dissolve 2.55 mL of tetrabutyl titanate in 20 mL of absolute ethanol, add ammonia solution while stirring, filter and wash to obtain precipitates of titanium oxyhydroxides. Dissolve 4.76 g of barium nitrate and 2.1 g of potassium hydroxide in 10 mL of deionized water, respectively. 50 mg graphene oxide was sonicated in 20 mL deionized water for 4 hours, then barium nitrate aqueous solution was added and stirred for another 10 hours. Mix and stir the titanium oxyhydroxide precipitation, barium nitrate and graphene oxide solution for 30 minutes, then add potassium hydroxide aqueous solution and stir for 10 minutes, then transfer to a 100 mL reactor liner, and adjust the reaction with deionized water The volume of the reaction material in the inner tank of the reactor reaches 75% of the inner tank volume of the reactor, and then placed in a stainless steel jacket, sealed, and kept at 140 ° C for 8 hours for hydrothermal treatment, and then allowed the reactor to cool natur...

Embodiment 3

[0036] Dissolve 2.55 mL of tetrabutyl titanate in 20 mL of absolute ethanol, add ammonia solution while stirring, filter and wash to obtain precipitates of titanium oxyhydroxides. Dissolve 4.76 g of barium nitrate and 2.1 g of potassium hydroxide in 10 mL of deionized water, respectively. 100 mg graphene oxide was sonicated in 20 mL deionized water for 5 hours, then barium nitrate aqueous solution was added and stirred for another 10 hours. Mix and stir the titanium oxyhydroxide precipitation, barium nitrate and graphene oxide solution for 30 minutes, then add potassium hydroxide aqueous solution and stir for 10 minutes, then transfer to the inner tank of a 100 mL reactor, and adjust the reactor with deionized water The volume of the reaction material in the inner tank reaches 75% of the volume of the inner tank of the reactor, and then placed in a stainless steel jacket, sealed, and kept at 180°C for 6 hours to carry out hydrothermal treatment, then allowing the reactor to co...

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Abstract

The invention discloses a graphene / titanate nanometer composite visible-light activated photocatalyst and a preparation method thereof, and belongs to the fields of nanometer composite materials and photocatalysis technology. The composite photocatalyst is prepared by compounding titanate and graphene, and the preparation method comprises the following steps: reacting tetrabutyl titanate with ammonia water to obtain a titanium hydroxyl compound; performing ultrasonic dispersion of graphene oxide in water, adding nitrate, stirring, mixing with the titanium hydroxyl compound and a potassium hydroxide aqueous solution, stirring, finally transferring the mixed solution into a reaction vessel to perform a hydrothermal reaction, after the reaction, performing centrifugation, filtration, washing, and vacuum drying of the product to obtain the composite photocatalyst. Photocatalytic degradation experiments show that the graphene / titanate composite photocatalyst prepared by the method has good photocatalytic degradation effect on rhodamine B under visible light irradiation. The photocatalyst of the invention has the advantages of relatively simple operation process, controllable morphology, no requirements for other reducing agents, and good visible-light activated photocatalysis performance.

Description

technical field [0001] The invention relates to a graphene / titanate nanocomposite visible light catalyst and a preparation method thereof, in particular to a method for preparing a graphene / titanate nanocomposite visible light catalyst by a hydrothermal method, belonging to the technical field of nanocomposite materials and photocatalysis . Background technique [0002] At present, the world is seriously polluted. my country is the largest country in the production and consumption of dyestuffs in the world. The pollution of dyestuffs and printing and dyeing wastewater is large and widespread. These wastewaters are one of the industrial wastewaters that are difficult to treat. It has the characteristics of complex chemical composition and difficult biochemical degradation; in recent years, the use of photocatalytic technology to degrade dye wastewater has become a research hotspot. Photocatalytic technology has the advantages of non-toxic, harmless, low cost, high activity...

Claims

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Application Information

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IPC IPC(8): B01J23/02B01J35/10
Inventor 张蓉仙杨小飞李扬高庆侠严学华夏娴娴刘恒
Owner JIANGSU UNIV
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