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Graphene/silver molybdenum oxide compound visible-light catalyst and preparation method thereof

A silver molybdate and visible light technology is applied in the field of composite materials and photocatalysis, which can solve the problems of multi-component mixing of silver molybdate, uneven morphology, poor visible light photocatalysis effect, etc., and achieves simple and safe preparation process and uniform size. , the effect of good electron transport ability

Inactive Publication Date: 2012-07-18
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a simple, feasible, low-cost and other problems in view of the few types of graphene-based composite visible light photocatalysts and the problems of multi-component silver molybdate mixed in composite materials, uneven appearance, and poor visible light photocatalytic effect. Preparation method of graphene / silver molybdate composite visible light catalyst with low cost and controllable structure and composition

Method used

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  • Graphene/silver molybdenum oxide compound visible-light catalyst and preparation method thereof

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Embodiment 1

[0020] Add 5 mg of graphene oxide to 20 mL of distilled water, and ultrasonicate for 3 hours to obtain a graphene oxide dispersion, then add 8 mmol of silver nitrate to the above graphene oxide dispersion, stir on a magnetic stirrer, and add to the solution 20 ml of 2 mmol ammonium heptamolybdate aqueous solution was added dropwise to the solution, and the pH value of the solution was adjusted to 1.5 with nitric acid solution; finally, the above mixed solution was transferred to a 100 ml hydrothermal reaction kettle, and reacted at 140°C for 24 hours; hydrothermal reaction After the final product is separated by high-speed centrifugation, it is washed with distilled water and absolute ethanol, repeated centrifugation and washing several times, and then dried in a vacuum oven.

Embodiment 2

[0022] Add 10 mg of graphene oxide to 20 mL of distilled water, ultrasonicate for 5 hours to obtain a graphene oxide dispersion, then add 15 mmol of silver nitrate to the above graphene oxide dispersion, stir on a magnetic stirrer, and add to the solution 20 ml of 2 mmol ammonium heptamolybdate solution was added dropwise to the solution, and the pH value of the solution was adjusted to 1.5 with nitric acid solution; finally, the above mixed solution was transferred to a 100 ml hydrothermal reaction kettle, and reacted at 160°C for 20 hours; hydrothermal reaction After the final product is separated by high-speed centrifugation, it is washed with distilled water and absolute ethanol, repeated centrifugation and washing several times, and then dried in a vacuum oven.

Embodiment 3

[0024] Add 20 mg of graphene oxide to 20 mL of distilled water, and obtain a graphene oxide dispersion by ultrasonication for 4 hours, then add 4 mmol of silver nitrate to the above graphene oxide dispersion, stir on a magnetic stirrer, and add to the solution 20 ml of 1 mmol ammonium heptamolybdate solution was added dropwise to the solution, and then the pH of the solution was adjusted to 2.0 with nitric acid solution; finally, the above mixed solution was transferred to a 100 ml hydrothermal reaction kettle, and reacted at 140°C for 24 hours; after the hydrothermal reaction After high-speed centrifugation, the product was washed with distilled water and absolute ethanol, repeated centrifugation and washing several times, and then dried in a vacuum oven.

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Abstract

The invention relates to a graphene / silver molybdenum oxide compound visible-light catalyst and a preparation method thereof, in particular to a method for preparing the graphene / silver molybdenum oxide-combined visible-light catalyst by water and heat, belonging to the technical field of compound materials and photocatalysis. The preparation method comprises the following steps: taking graphene oxide, silver nitrate and ammonium heptamolybdate as raw materials according to certain proportion, mechanically stirring and mixing the raw materials uniformly in sequence, adjusting the pH value of solution, and then utilizing hydro-thermal reaction to prepare the graphene / silver molybdenum oxide compound visible-light catalyst. The photocatalytic degradation experiment shows that the graphene / silver molybdenum oxide compound visible-light catalyst prepared by the method has a good phtocatalytic degradation effect on rhodamine B due to the irradiation of the visible light and is ideal.

Description

technical field [0001] The invention relates to a graphene / silver molybdate composite visible light catalyst and a preparation method thereof, in particular to a method for hydrothermally preparing a graphene / silver molybdate composite visible light catalyst, which belongs to the technical field of composite materials and photocatalysis. Background technique [0002] The energy and environmental issues brought about by the development of industrialization have evolved into global issues; the non-renewability of fossil fuels and the discharge of industrial pollutants seriously threaten the further development of human beings. To build a clean, environmentally friendly renewable energy system and Environmental pollution control technology has become the focus of attention in various countries. Photocatalytic technology based on the use of sunlight has shown great application potential in the fields of clean energy production and environmental pollution control; the key to photo...

Claims

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Application Information

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IPC IPC(8): B01J23/68
Inventor 杨小飞李荣张蓉仙高庆侠夏娴娴刘恒
Owner JIANGSU UNIV
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