Preparation method of superhydrophobic melamine sponge modified by utilizing dopamine and carbon nanotubes

A technology of carbon nanotube modification and melamine sponge, which is applied in the field of preparation of superhydrophobic melamine sponge, can solve the problems of high cost, complicated preparation process, and improvement of adsorption selectivity, and achieve mild reaction conditions and simple equipment Effect

Active Publication Date: 2018-02-23
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of existing sponge adsorption materials such as complex preparation process, high cost, and adsorpt

Method used

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  • Preparation method of superhydrophobic melamine sponge modified by utilizing dopamine and carbon nanotubes
  • Preparation method of superhydrophobic melamine sponge modified by utilizing dopamine and carbon nanotubes
  • Preparation method of superhydrophobic melamine sponge modified by utilizing dopamine and carbon nanotubes

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] According to the mass ratio of dopamine hydrochloride and Tris is 0.79, and the dopamine hydrochloride concentration added is the ratio of 2g / L to prepare two parts of dopamine solutions of the same composition, then add a few drops of concentrated hydrochloric acid with a mass fraction of 36.5% to adjust the pH of the solution, so that It falls between 7-8. According to the mass ratio of carbon nanotubes to dopamine hydrochloride used in the preparation of dopamine solution of 1:2, carbon nanotubes were added to one part of the dopamine solution, stirred briefly and ultrasonically dispersed at 45°C for 30min, then magnetically dispersed at 20°C. Stir for 24h. The resulting black solution was filtered and washed with a large amount of distilled water, and the carbon nanotubes on the microfiltration membrane were collected and vacuum-dried at 50° C. to obtain CNTs-PDA. The purchased melamine sponge (1cm×1cm×1cm) was soaked in ammonia water / ethanol solution (the volume r...

Embodiment 2

[0036] According to the mass ratio of dopamine hydrochloride and Tris is 0.83, and the concentration of added dopamine hydrochloride is the ratio of 2g / L to prepare two parts of dopamine solutions of the same composition, then drop a few drops of concentrated hydrochloric acid with a mass fraction of 36.5% to adjust the pH of the solution, Make it fall between 7-8. According to the mass ratio of carbon nanotubes to dopamine hydrochloride 1:2, carbon nanotubes were added to one part of the dopamine solution, stirred briefly and ultrasonically dispersed at 45°C for 60min, followed by magnetic stirring at 20°C for 24h. The resulting black solution was filtered and washed with a large amount of distilled water, and the carbon nanotubes on the microfiltration membrane were collected and vacuum-dried at 60°C to obtain CNTs-PDA. Soak the purchased melamine sponge (1cm×1cm×1cm) in ammonia water / ethanol solution (the volume ratio of ammonia water to ethanol is 1:1), ultrasonically clea...

Embodiment 3

[0040] According to the mass ratio of dopamine hydrochloride and Tris is 0.91, and the concentration of added dopamine hydrochloride is the ratio of 2g / L to prepare two parts of dopamine solutions of the same composition, then add a few drops of concentrated hydrochloric acid with a mass fraction of 36.5% to adjust the pH of the solution, Make it fall between 7-8. According to the mass ratio of carbon nanotubes to dopamine hydrochloride 1:2, carbon nanotubes were added to one part of the dopamine solution, stirred briefly, ultrasonically dispersed at 50°C for 30min, and then magnetically stirred at 25°C for 24h. The resulting black solution was filtered and washed with a large amount of distilled water, and the carbon nanotubes on the microfiltration membrane were collected and dried in vacuum at 45°C to obtain CNTs-PDA. Soak the purchased melamine sponge (1cm×1cm×1cm) in ammonia water / ethanol solution (the volume ratio of ammonia water to ethanol is 1:1), ultrasonically clean...

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Abstract

The invention discloses a preparation method of superhydrophobic melamine sponge modified by utilizing dopamine and carbon nanotubes. The preparation method is characterized in that the carbon nanotubes are combined with melamine sponge through oxidative autopolymerization of dopamine, so that oil-water selectivity of the melamine sponge is improved. The preparation method comprises the followingconcrete steps: firstly, combining the carbon nanotubes with dopamine by utilizing adhesion of dopamine, then coating a melamine sponge skeleton with the carbon nanotubes through the oxidative autopolymerization under alkaline conditions, and drying sponge to be constant weight, thus obtaining modified sponge with hydrophobic and lipophilic properties. The preparation method disclosed by the invention has the advantages that the carbon nanotubes are connected with the melamine sponge by virtue of chemical bonds, so that connection is tight and content is high; meanwhile, the structures of thecarbon nanotubes are not destroyed, so that sponge has stronger hydrophobic property and oil retaining capability, the obtained melamine sponge is light in weight and can be conveniently recycled, andefficient purification on floating oil on water surface can be realized.

Description

technical field [0001] The invention relates to the technical field of adsorption materials, in particular to a preparation method of a superhydrophobic melamine sponge modified by dopamine and carbon nanotubes. Background technique [0002] With the rapid development of industry, oil spills and the discharge of toxic chemical reagents have caused serious environmental and ecological problems. Health poses a great threat. [0003] There are many materials used to control pollution. According to the types and sources of materials, oil-absorbing materials can be traditionally divided into three categories, namely inorganic materials, including zeolite, bentonite, coal ash and activated carbon, etc.; organic natural materials, including straw Fibers, wood chips, reeds, and cornstalks; organic synthetic materials, including polypropylene fibers, alkyl acrylate copolymers, and polyurethane foams. Most inorganic materials are cheap, but they have low oil absorption capacity and ...

Claims

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Application Information

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IPC IPC(8): C08J9/40B01J20/26B01J20/28B01J20/30C08L61/28
CPCB01J20/262B01J20/28045C08J9/40C08J2361/28
Inventor 吴江渝张虞高慧敏曾小平张勇
Owner WUHAN INSTITUTE OF TECHNOLOGY
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