Method for preparing graphene composite material adsorbing polycyclic aromatic hydrocarbon pollutants

A polycyclic aromatic hydrocarbon and composite material technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of unsatisfactory adsorption efficiency and high cost of carbon nanotubes, and achieve low preparation cost, easy availability of raw materials, and wide application range. Effect

Inactive Publication Date: 2011-05-18
淮安奥正网络科技有限公司
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Problems solved by technology

However, the cost of carbon nanotubes is hig

Method used

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  • Method for preparing graphene composite material adsorbing polycyclic aromatic hydrocarbon pollutants

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Embodiment 1

[0029] A certain amount of graphite oxide was weighed and placed in ultrapure water, and ultrasonicated for 30 minutes to obtain a 0.05 wt% graphene oxide suspension. Aspirate 5 mL of it and add 5 mL of ultrapure water, and then add 3.5 μL of hydrazine hydrate (50 wt%) and 35 μL of ammonia water (28 wt%) respectively. After fully mixing, add a layer of silicone oil on the liquid surface to prevent aggregation caused by evaporation of water during heating, and bathe in 95°C water bath for 1 hour to obtain a graphene dispersion solution with a mass content of 0.025%. Under vigorous stirring, add 10 mL of 0.1 mol / L sodium lauryl sulfate and 10 mL of 0.2 mol / L calcium chloride solution, and continue stirring to make the solution uniform. Quickly add 30 mL of 0.2 mol / L sodium carbonate solution to form a precipitate. The precipitate was collected by centrifugation, washed three times with deionized water and absolute ethanol, and dried to obtain a calcium carbonate-supported graph...

Embodiment 2

[0031] Add 0.05 g of graphene to 5 mL of 5% sodium dodecylbenzenesulfonate solution, and ultrasonicate for 10 minutes to obtain a graphene dispersion with a mass content of 1%, which is ready for use. Stir the mixed solution of tetraethyl orthosilicate, absolute ethanol and deionized water for 1 hour, slowly drop into the prepared graphene dispersion solution, and continue to stir for 2 to 3 hours, so that the graphene and the sol solution are fully mixed, and the solution has no precipitation, and then Put the homogeneous composite sol in a 100mL petri dish, seal it with adhesive tape, age and dry to obtain a composite xerogel. During the drying process of the composite gel, the matrix SiO 2A porous structure is formed in which graphene is uniformly dispersed. Then sintering is carried out at 200-1000° C. to remove polymer residues, and a graphene composite material supported by mesoporous silica is obtained after cooling.

Embodiment 3

[0033] A certain amount of styrene was placed in a separatory funnel, and washed four times with 0.1 mol / L NaOH solution and deionized water successively to remove the polymerization inhibitor therein. Add 250mL of water and washed styrene into a five-necked flask, blow in nitrogen, stir and reflux, and heat to 70°C. Add 0.2-1g graphene, stir and disperse for 30min. Initiator K 2 S 2 o 8 Dissolve in 50mL of distilled water, heat to 70°C, add dropwise into a five-necked bottle, finish dropping in 30min, and react for 15h to obtain a brown-black graphene-dispersed polystyrene emulsion. The emulsion can be coated on a carrier such as glass, and dried to obtain a composite material of polycyclic aromatic hydrocarbons supported by polystyrene.

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Abstract

The invention discloses a method for preparing a graphene composite material adsorbing polycyclic aromatic hydrocarbon pollutants. The graphene composite material is prepared by dispersing the graphene in a precursor solution of a support body material and enabling the precursor of the support body material to generate cure reaction. The specific preparation steps and adsorption process are as follows: (1) preparing a graphene dispersion solution; (2) preparing the precursor solution of the support body material; (3) mixing the graphene dispersion solution and the precursor solution of the support body material; (4) initializing the precursor solution of the support body material for cure reaction, and adding graphene to obtain the graphene composite material; and (5) soaking the prepared graphene composite adsorption material in a polycyclic aromatic hydrocarbon solution, wherein the polycyclic aromatic hydrocarbon is adsorbed on the surface of graphene due to pi-pi mutual action between the graphene and the polycyclic aromatic hydrocarbon. According to the invention, the enrichment and adsorption capacities of the graphene on the polycyclic aromatic hydrocarbon are improved by means of large pi system and super large specific surface area.

Description

Technical field: [0001] The invention relates to a preparation method and application of a graphene composite material for adsorbing environmental pollutants polycyclic aromatic hydrocarbons. Background technique: [0002] Polycyclic aromatic hydrocarbons (Polycyclic Aromatic Hydrocarbons) are aromatic compounds containing more than two benzene rings, many of which have been proven to be carcinogenic and toxic, and are a typical class of persistent organic pollutants, which are commonly found in food, drinking water, decorative materials, etc. In the substances that people are exposed to daily and in the natural environment of human life, long-term exposure can induce lung cancer, skin cancer and other cancers, and has been listed as a priority pollutant by various countries. The preparation of adsorbents with selectivity to polycyclic aromatic hydrocarbons, on the one hand, is used to remove polycyclic aromatic hydrocarbons in the environment; on the other hand, it is used ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30
Inventor 沈晓芳崔燕庞月红
Owner 淮安奥正网络科技有限公司
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