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Modified graphene for efficiently adsorbing methyl orange dye and preparation method of modified graphene

A technology of graphene and methyl orange, which is applied in the field of modified graphene and its preparation, can solve the problems that chitosan quaternary ammonium salt and graphene composite materials have not yet appeared, hinder the application of graphene, and poor dispersion, and achieve good Water solubility and biological activity, easy handling, effect of reducing agglomeration

Inactive Publication Date: 2015-01-28
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the van der Waals force between graphenes makes graphene easy to agglomerate, and its dispersion in aqueous media and organic solvents is relatively poor, which hinders the application of graphene in adsorption.
If the combination of chitosan quaternary ammonium salt and graphene is used as an adsorbent, it will open up a new way for adsorbents, but chitosan quaternary ammonium salt and graphene composite materials have not yet appeared in the prior art

Method used

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  • Modified graphene for efficiently adsorbing methyl orange dye and preparation method of modified graphene
  • Modified graphene for efficiently adsorbing methyl orange dye and preparation method of modified graphene

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Adopt modified Hummers method to synthesize graphite oxide, concrete steps are as follows:

[0027] Place the flask filled with 46ml of concentrated sulfuric acid (98%) in an ice-water bath and cool it to 0°C, take 2.0g of natural flake graphite and slowly add it to the concentrated H 2 S0 4 and stir rapidly until uniformly dispersed. 6.0gKMnO 4 and 1.0g NaNO 3 Slowly add it into the above flask, try to control the temperature at 10°C to 15°C, and continue stirring for 2h. Then the resulting mixture was transferred to a constant temperature (35° C.) water bath and stirred for 2 h. Add 130ml of distilled water in batches, keep the temperature under 90°C and continue the reaction for 30min, then add 150ml of distilled water to dilute. Finally, add a certain amount of hydrogen peroxide with a volume fraction of 30% until the mixture turns bright yellow, filter, and fully wash the filter product with 5% HCl solution until the sulfate ion SO in the filter cake produ...

Embodiment 2

[0031] The amount of graphite oxide was changed to 0.06g and 0.15g, the high temperature reaction temperature was 60°C, and other conditions remained unchanged, and two kinds of modified graphenes implemented in this case were prepared according to step (2) of Example 1. Add the prepared modified graphene to the methyl orange solution with an initial concentration of 34mg / L, the amount of adsorbent is 0.2g / L, the pH value of the solution is 7, the rotational speed of the oscillation reaction is 100rpm, and the time of the oscillation reaction 8h, the adsorption temperature is 30 ℃, when the amount of graphite oxide is 0.06g and 0.15g, the adsorption rate of methyl orange is 81.13% and 85.67%, respectively.

Embodiment 3

[0033]Change the concentration of 2-hydroxypropyltrimethylammonium chloride chitosan aqueous solution to 7mg / mL and 3mg / mL, the normal temperature reaction time is 2h, and other conditions remain unchanged, prepare this case according to the step (2) of Example 1 Implemented two modified graphene. Add the prepared modified graphene to the methyl orange solution with an initial concentration of 34mg / L, the amount of adsorbent is 0.2g / L, the pH value of the solution is 7, the rotational speed of the oscillation reaction is 100rpm, and the time of the oscillation reaction 8h, the adsorption temperature is 30 ℃, when the concentration of chitosan quaternary ammonium salt solution is 7mg / mL and 3mg / mL, the adsorption rate of methyl orange is 96.10% and 81.93%, respectively.

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Abstract

The invention relates to modified graphene for efficiently adsorbing methyl orange dye. According to the modified graphene, water-soluble chitosan quaternary ammonium salt is grafted to the surface of graphene oxide by using the electrostatic function of a non-covalent bond, the graphene oxide is reduced by using a chemical reduction method, and meanwhile the chitosan quaternary ammonium salt is retained on the surface of graphene; specifically, the modified graphene is prepared by firstly, ultrasonically dispersing graphene oxide into sodium hydroxide solution so as to obtain a graphene oxide dispersion liquid, subsequently adding into a chitosan quaternary ammonium salt solution, and mixing and stirring; adjusting the pH value of the mixed liquid by using the sodium hydroxide solution, adding a reducing agent hydrazine hydrate, and heating to obtain black flocculent precipitate, performing suction filtration, washing and drying. The modified graphene provided by the invention is good in dispersity in water, with the combination of the electrostatic function of the chitosan quaternary ammonium salt and the synergistic effect of the large specific surface area of graphene, methyl orange in a solution can be effectively removed, the adsorption property is high, the adsorption is stable, and the dye wastewater treatment efficiency is improved.

Description

technical field [0001] The invention relates to graphene, in particular to a modified graphene with good adsorption performance and good stability of methyl orange dye and its preparation through the electrostatic action of chitosan quaternary ammonium salt and the synergistic effect of graphene's huge specific surface area method. Background technique [0002] With the development of printing and dyeing industry, dye wastewater has become one of the main sources of water pollution in my country. Dye wastewater has high chemical oxygen demand, deep color, complex organic components, stable chemical properties, and is difficult to degrade. It is a difficult organic wastewater to treat, which has brought serious harm to humans and aquatic organisms. It is therefore crucial to treat these dye-containing effluents before they are discharged into water bodies. Methyl orange solution is the main representative of dye compounds, which has quinone and azo structures under acidic a...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F103/30
CPCB01J20/20B01J20/24B01J2220/46B01J2220/4806B01J2220/4825C02F1/283C02F1/286C02F2101/308C02F2103/30
Inventor 陈艳军夏元玲王慧萍姚荣沂龙瑞婷陈明
Owner WUHAN UNIV OF TECH
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