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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the preparation of Ag / TiO by photocatalytic reduction 2 / Graphene nanocomposite photocatalyst has not been reported

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of graphite oxide. Add 2g of graphite powder to potassium persulfate (1g) and concentrated sulfuric acid solution (15mL) of 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 of concentrated sulfuric acid solution at 0°C, then slowly add 6g of potassium permanganate, then react at 35°C for 2 hours, and finally slowly add 100mL of deionized water and 20mL of 30% hydrogen peroxide terminated the reaction, suction filtered, washed, and dialyzed to obtain graphite oxide, whose XRD pattern is shown in figure 2 ;

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

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

[0028] (4) the graphite oxide dispersion liquid that step (2) ...

Embodiment 2

[0030] (1) with the step (1) in the implementation example 1;

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

[0032] (3) with step (3) in the implementation example 1;

[0033] (4) the graphite oxide dispersion liquid that step (2) is made is mixed with the silver nitrate solution that step (3) is made, then 5g titanium dioxide (P25) is dispersed in the mixed solution, then transfers in the photocatalytic reactor, Photocatalytic reduction reaction under simulated sunlight for 3 hours, filtered, washed, and vacuum dried at 80°C for 12 hours to obtain Ag / TiO 2 / Graphene nanocomposite photocatalyst.

Embodiment 3

[0035] (1) with the step (1) in the implementation example 1;

[0036] (2) with the step (2) in the implementation example 1;

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

[0038] (4) the graphite oxide dispersion liquid that step (2) is made is mixed with the silver nitrate solution that step (3) is made, then 5g titanium dioxide (P25) is dispersed in the mixed solution, then transfers in the photocatalytic reactor, Photocatalytic reduction reaction under simulated sunlight for 3 hours, filtered, washed, and vacuum dried 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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