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Graphene/silver phosphate composite visible light photocatalyst and preparation method thereof

A photocatalyst and visible light technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low utilization rate of visible light, low degradation efficiency of high-concentration organic dyes, etc. Large-scale promotion, simple preparation method, and wide response range of visible light

Inactive Publication Date: 2012-08-15
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a low-cost high-efficiency graphene / silver phosphate composite visible light photocatalyst and its preparation method. For the first time, a graphene / silver phosphate composite photocatalyst with controllable structure, high activity and visible light response has been prepared by hydrothermal method. The catalyst realizes the in-situ reduction of graphene oxide and the effective control of the morphology of silver phosphate in the hydrothermal process, and solves the problems of low utilization rate of visible light and low degradation efficiency of high-concentration organic dyes in existing photocatalysts. The graphene / silver phosphate composite material prepared in situ by thermal method is used in the field of visible light photocatalysis. The preparation method is simple and easy, does not require complicated and expensive equipment, and the synthesis conditions are mild. The silver particles are uniformly distributed on the graphene and the morphology is controllable; and the composite photocatalytic materials with different ratios can be obtained by adjusting the mass percentage of graphene oxide and silver nitrate, which can be achieved without reducing the photocatalytic activity to a certain extent. reduce the cost of materials

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  • Graphene/silver phosphate composite visible light photocatalyst and preparation method thereof
  • Graphene/silver phosphate composite visible light photocatalyst and preparation method thereof
  • Graphene/silver phosphate composite visible light photocatalyst and preparation method thereof

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Embodiment 1

[0027]Take 20 mg of graphene oxide and ultrasonically disperse in 20 mL of deionized water for 3 hours; under the condition of magnetic stirring, dissolve 1.53 g of silver nitrate in 20 mL of deionized water to obtain a silver nitrate solution with a concentration of 0.45 mol / L, and add it dropwise In the above graphene oxide dispersion, continue to stir for 3 hours and then age for 12 hours to obtain a mixed precursor solution A; dissolve 0.43 g of disodium hydrogen phosphate in 20 mL of deionized water to obtain a concentration of 0.15 mol / L of disodium hydrogen phosphate solution; under magnetic stirring conditions, add the disodium hydrogen phosphate solution dropwise to the mixed precursor solution A until the reaction system appears brownish-yellow turbid; In the reaction kettle, react at 140° C. for 24 hours, cool to room temperature; filter with suction, wash the precipitate with deionized water and absolute ethanol several times, and dry it in vacuum.

Embodiment 2

[0029] Take 50 mg of graphene oxide and ultrasonically disperse it in 30 mL of deionized water for 3 hours. Under the condition of magnetic stirring, dissolve 1.53 g of silver nitrate in 20 mL of deionized water to obtain a silver nitrate solution with a concentration of 0.45 mol / L, and add it dropwise In the above graphene oxide dispersion, continue to stir for 4 hours and then age for 16 hours; dissolve 0.43 g of disodium hydrogen phosphate in 20 mL of deionized water to obtain a disodium hydrogen phosphate solution with a concentration of 0.15 mol / L; The disodium hydrogen phosphate solution was added dropwise to the graphene oxide / silver nitrate solution until brownish yellow turbidity appeared in the reaction system; after the dropwise addition was completed, the stirring was continued at room temperature for 30 minutes, and the mixed solution was transferred to a hydrothermal reaction kettle for 160 °C for 20 hours, cooled to room temperature; filtered with suction, washed...

Embodiment 3

[0031] Take 100 mg of graphene oxide and ultrasonically disperse it in 30 mL of deionized water for 4 hours. Under the condition of magnetic stirring, dissolve 1.53 g of silver nitrate in 20 mL of deionized water to obtain a silver nitrate solution with a concentration of 0.45 mol / L, and add it dropwise In the above-mentioned graphene oxide dispersion, continue to stir for 5 hours and then age for 20 h; dissolve 0.43 g of disodium hydrogen phosphate in 20 mL of deionized water to obtain a disodium hydrogen phosphate solution with a concentration of 0.15 mol / L; Add the disodium hydrogen phosphate solution dropwise to the graphene oxide / silver nitrate solution until brownish yellow turbidity appears in the reaction system; after the dropwise addition, continue to stir at room temperature for 40 minutes, transfer the mixed solution to the hydrothermal reaction kettle, 180 °C for 16 hours, cooled to room temperature; filtered with suction, washed the precipitate with deionized wate...

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Abstract

The invention discloses a high-efficiency graphene / silver phosphate composite visible light photocatalyst and a preparation method thereof, belonging to the technical field of composite materials and environmental management photocatalysis. The preparation method comprises the following steps: dissolving graphene oxide in water, and carrying out ultrasonic treatment to obtain a graphene oxide dispersed liquid; dissolving silver nitrate in deionized water, gradually and dropwisely adding into the graphene oxide dispersed liquid while stirring to obtain a mixed solution, uniformly stirring, and aging; dropwisely adding a prepared disodium hydrogen phosphate or sodium dihydrogen phosphate solution into the graphene oxide-silver nitrate mixed solution, continuing stirring, transferring into a hydrothermal reaction kettle, carrying out hydrothermal reaction, and cooling to room temperature; and washing the reaction product, and carrying out vacuum drying to obtain the visible light photocatalyst. The invention has the advantages of wide material sources and simple preparation process; and the obtained composite material has the advantages of controllable structure and regular pattern, and has high-efficiency degradation effect on organic dyes rhodamine B and methylene blue with certain concentration under the visible light irradiation.

Description

technical field [0001] The present invention relates to photocatalysts, in particular to a graphene / silver phosphate composite visible light photocatalyst and its preparation method, especially to a graphene / silver phosphate composite visible light photocatalyst and its hydrothermal preparation method, belonging to composite materials and environmental Governance in the field of photocatalytic technology. Background technique [0002] Since the 1970s, continuous environmental pollution and energy shortages have aroused people's concerns about the global crisis. In order to achieve the sustainable development of human society, a new kind of energy that can be used for environmental governance and clean energy preparation should be developed. Technology has become an urgent and urgent task. Photocatalytic technology has been highly valued because of its broad application prospects in the fields of environmental protection, clean energy preparation (solar energy into hydrogen e...

Claims

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Application Information

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IPC IPC(8): B01J27/18C02F1/30
Inventor 杨小飞刘恒李扬张蓉仙李忠李荣夏娴娴
Owner JIANGSU UNIV
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