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Method for preparing graphene-based titanium dioxide composite photocatalyst by radiation of electron beams

A technology of electron beam irradiation, titanium dioxide

Active Publication Date: 2010-03-03
安徽省通源环境节能股份有限公司
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Problems solved by technology

[0004] Since research on graphene is still in its infancy, to the best of our knowledge, no graphene / titania composites have been reported as photocatalysts.

Method used

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  • Method for preparing graphene-based titanium dioxide composite photocatalyst by radiation of electron beams
  • Method for preparing graphene-based titanium dioxide composite photocatalyst by radiation of electron beams
  • Method for preparing graphene-based titanium dioxide composite photocatalyst by radiation of electron beams

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Experimental program
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Embodiment

[0028] Firstly, graphene is prepared according to the prior known technology (this technical method can refer to the document J.Am.Chem.Soc., 2008, 130(18), 5856-5857).

[0029] 1. Preparation of graphene

[0030] (1), preparation of graphene oxide

[0031] A certain amount of potassium persulfate (K 2 S 2 o 8 ) and phosphorus pentoxide (P 2 o 5 ) was dissolved in concentrated sulfuric acid, heated to 80°C, added a certain amount of natural graphite, kept at 80°C for 4.5 hours, and then cooled to room temperature; then diluted with deionized water, and left overnight; then filtered, washed, and the obtained filter residue was released Dry in a vacuum oven at 60°C; dissolve the dried filter residue in concentrated sulfuric acid, and slowly add potassium permanganate (KMnO 4 ), stirred at 35°C for 2 hours; then diluted with deionized water, and slowly added 30% hydrogen peroxide (H 2 o 2 ); then filter and wash, and vacuum-dry the washed product at 60° C. to obtain a gra...

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Abstract

The invention relates to a method for preparing a graphene-based titanium dioxide composite photocatalyst by radiation of electron beams, belonging to the technical fields of radiation chemistry and photocatalyst preparation. The method comprises the following steps: firstly, preparing graphene by the prior art, then adding the graphene powder into a titanium tetrafluoride solution, and dispersingthe graphene powder with ultrasonic waves to obtain a suspension; then putting the suspension in an electron beam generating device to be radiated by a certain dose of electron beams, the irradiationdose of which is 70-280KGy; after sealing, putting the suspension in an oven of 60 DEG C for reaction for 20 hours; and finally, obtaining the graphene-based titanium dioxide composite photocatalystby washing and drying. The inspection proves that the graphene-based titanium dioxide composite photocatalyst prepared by the method of the invention has higher photocatalytic activity. In addition, by inspecting with a transmission electron microscope (TEM), titanium dioxide crystals which are densely and evenly loaded on the graphene matrix can be seen.

Description

technical field [0001] The invention relates to a method for preparing a graphene-based titanium dioxide composite photocatalyst by electron beam irradiation, and belongs to the technical fields of radiation chemistry and photocatalyst preparation. Background technique [0002] Since Fujishima and Honda discovered TiO in 1972 2 Since the photo-splitting of water, researchers from various countries have paid extensive attention to semiconductor photocatalytic reactions. TiO 2 As an important semiconductor material, because of its high photocatalytic activity (strong absorption of ultraviolet light; large energy gap between forbidden band and conduction band, strong reducibility and oxidation of photogenerated electrons and holes), chemical properties Stable, non-toxic to organisms, rich sources of raw materials and other advantages, it has become a research hotspot in the field of photocatalysis. Nevertheless, nano-TiO 2 There are still certain problems in photocatalytic ...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J21/06B01J37/34C02F1/30C02F101/30
Inventor 张海娇焦正徐盼盼郭会娇王琳潘登余谈志金
Owner 安徽省通源环境节能股份有限公司
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