Ag/TiO2/graphene nanometer composite photocatalyst and preparation method thereof

A nanocomposite and photocatalyst technology is applied in the field of Ag/TiO2/graphene nanocomposite photocatalyst and its preparation, and achieves the effects of good environment, cheap reagents and simple formation process

Inactive Publication Date: 2012-09-26
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the preparation of Ag/TiO by photocatalytic reduction 2

Method used

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  • Ag/TiO2/graphene nanometer composite photocatalyst and preparation method thereof
  • Ag/TiO2/graphene nanometer composite photocatalyst and preparation method thereof
  • Ag/TiO2/graphene nanometer composite photocatalyst and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0024] Example one:

[0025] (1) Preparation of graphite oxide. Add 2g of graphite powder to a concentrated sulfuric acid solution (15mL) of potassium persulfate (1g) and phosphorus pentoxide (1g) at 80°C, pre-oxidize for 6 hours, then cool to room temperature, filter with suction, and wash until neutral. Add pre-oxidized graphite powder (2g) to 50mL concentrated sulfuric acid solution at 0℃, then slowly add 6g potassium permanganate, then react at 35℃ for 2 hours, and finally slowly add 100mL deionized water and 20mL to the reaction solution The reaction is terminated with 30% hydrogen peroxide. The graphite oxide is prepared by suction filtration, washing, and dialysis. The XRD pattern is shown in figure 2 ;

[0026] (2) Preparation of graphite oxide dispersion. Disperse 50 mg of graphite oxide ultrasonically in 50 mL of absolute ethanol for 1 hour;

[0027] (3) The configuration of silver nitrate solution. Dissolve 85 mg of silver nitrate in 100 mL of distilled water;

[0028]...

Example Embodiment

[0029] Embodiment two:

[0030] (1) Same as step (1) in implementation example 1;

[0031] (2) Preparation of graphite oxide dispersion. Disperse 50 mg of graphite oxide in 50 mL of methanol ultrasonically for 1 hour;

[0032] (3) Same as step (3) in implementation example 1;

[0033] (4) Mix the graphite oxide dispersion prepared in step (2) with the silver nitrate solution prepared in step (3), and then disperse 5 g of titanium dioxide (P25) in the mixed solution, and then transfer to the photocatalytic reactor, Photocatalytic reduction reaction under simulated sunlight for 3 hours, filtration, washing, and vacuum drying at 80°C for 12 hours to obtain Ag / TiO 2 / Graphene nanocomposite photocatalyst.

Example Embodiment

[0034] Example three:

[0035] (1) Same as step (1) in implementation example 1;

[0036] (2) Same as step (2) in implementation example 1;

[0037] (3) The configuration of silver nitrate solution. Dissolve 170 mg of silver nitrate in 100 mL of distilled water;

[0038] (4) Mix the graphite oxide dispersion prepared in step (2) with the silver nitrate solution prepared in step (3), and then disperse 5 g of titanium dioxide (P25) in the mixed solution, and then transfer to the photocatalytic reactor, Photocatalytic reduction reaction under simulated sunlight for 3 hours, filtration, washing, and vacuum drying at 80°C for 12 hours to obtain Ag / TiO 2 / Graphene nanocomposite photocatalyst.

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Abstract

The invention discloses an Ag/TiO2/graphene nanometer composite photocatalyst and a preparation method thereof, belonging to the field of new materials. The Ag/TiO2/graphene nanometer composite photocatalyst is prepared by assembling metal silver, nanometer titanium dioxide (P25) powder onto a two-dimensional lamellate graphene carrier material by using a photocatalytic oxidation-reduction method, using the two-dimensional lamellate graphene as the carrier material, the silver nitrate as the silver source and the nanometer titanium dioxide as the photocatalysis material, initiating the nanometer titanium dioxide to generate photoproduction electron and photoproduction hole by stimulating sunlight, capturing the photoproduction hole by a sacrifice agent, and restoring the silver ion and the graphite oxide to be metal Ag and graphene by the photoproduction electron. The invention has simple preparation method and low cost in reagent, is beneficial to large-scale preparation, and provides an environment-friendly method for preparing graphene load composite photocatalyst through the restoration of the graphite oxide.

Description

technical field [0001] The invention belongs to the technical field of new materials and their preparation, and relates to an Ag / TiO 2 / Graphene nanocomposite photocatalyst and preparation method thereof. technical background [0002] Titanium dioxide is widely used in the fields of solar energy conversion and utilization and environmental governance because of its good band gap, strong photocatalytic redox ability, non-toxicity, low price and good photochemical stability. However, because titanium dioxide can only be excited by ultraviolet light to generate photogenerated electrons and holes, and their recombination probability is high, the photocatalytic efficiency is low. Therefore, using different methods to modify titanium dioxide to improve the photocatalytic efficiency of photocatalysts has increasingly become a research hotspot in this field. [0003] Graphene is a two-dimensional nanostructure composed of a single layer of carbon atoms, which has excellent electri...

Claims

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Application Information

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IPC IPC(8): B01J23/50
Inventor 阎建辉周民杰唐课文张丽张娜
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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