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Reduced graphene oxide emulsion separating film, and preparation method and application thereof

An emulsion separation, graphene membrane technology, applied in separation methods, liquid separation, chemical instruments and methods, etc., to achieve high separation efficiency, good stability, and mild raw materials.

Inactive Publication Date: 2016-01-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although reduced graphene oxide materials have been widely used in conductive films, nanofilling materials, and secondary reaction platforms of grafted functionalized polymers, their application in sewage treatment has rarely been reported.

Method used

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  • Reduced graphene oxide emulsion separating film, and preparation method and application thereof
  • Reduced graphene oxide emulsion separating film, and preparation method and application thereof
  • Reduced graphene oxide emulsion separating film, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1. Preparation of self-supporting reduced graphene oxide emulsion separation film by mussel bionic method:

[0044]1) At room temperature (25°C), add 3.0mL of graphene oxide aqueous solution and 30mL of deionized water to a 50mL beaker in turn, so that the volume ratio of graphene oxide aqueous solution and water is 1:10, add a magnet and stir evenly to obtain Graphene oxide aqueous solution with a concentration of 0.58mg / mL;

[0045] 2) At room temperature (25°C), add 120 mg of dopamine hydrochloride and 60 mL of deionized water to another 50 mL beaker in sequence, then add a magnet and stir evenly to obtain a dopamine hydrochloride aqueous solution with a concentration of 2.0 mg / mL;

[0046] 3) adding the dopamine hydrochloride aqueous solution obtained in step 2) to the diluted graphene oxide aqueous solution obtained in step 1), stirring evenly to obtain a mixed solution;

[0047] 4) Add 0.9 mL of tris aqueous solution (as a buffer solution) with a concentr...

Embodiment 2

[0053] Example 2. Preparation of self-supporting reduced graphene oxide emulsion separation film by mussel biomimetic method:

[0054] 1) At room temperature (25°C), add 1.5mL graphene oxide aqueous solution and 30mL deionized water to a 50mL beaker in turn, so that the volume ratio of graphene oxide aqueous solution and water is 1:20, add a magnet and stir evenly to obtain the concentration 0.29 mg / mL graphene oxide aqueous solution;

[0055] 2) At room temperature (25°C), add 60 mg of dopamine hydrochloride and 15 mL of deionized water to another 50 mL beaker in sequence, then add a magnet and stir evenly to obtain an aqueous solution of dopamine hydrochloride with a concentration of 4.0 mg / mL;

[0056] 3) adding the dopamine hydrochloride aqueous solution obtained in step 2) to the diluted graphene oxide aqueous solution obtained in step 1), stirring evenly to obtain a mixed solution;

[0057] 4) Add 0.5 mL of tris aqueous solution with a concentration of 1.0 mol / L (as a b...

Embodiment 3

[0063] Example 3. Preparation of self-supporting reduced graphene oxide emulsion separation film by mussel bionic method:

[0064] 1) At room temperature (25°C), add 4.5mL graphene oxide aqueous solution and 15mL deionized water to a 50mL beaker in turn, so that the volume ratio of graphene oxide aqueous solution and water is 3:10, add a magnet and stir evenly to obtain the concentration 1.74mg / mL graphene oxide aqueous solution;

[0065] 2) At room temperature (25°C), add 180 mg of dopamine hydrochloride and 120 mL of deionized water to another 250 mL beaker in sequence, then add a magnet and stir evenly to obtain a dopamine hydrochloride aqueous solution with a concentration of 1.5 mg / mL;

[0066] 3) adding the dopamine hydrochloride aqueous solution obtained in step 2) to the diluted graphene oxide aqueous solution obtained in step 1), stirring evenly to obtain a mixed solution;

[0067] 4) Add 2.0 mL of tris aqueous solution with a concentration of 1.0 mol / L (as a buffer ...

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Abstract

The invention discloses a reduced graphene oxide emulsion separating film, and a preparation method and application thereof. The preparation method comprises the following steps: 1) mixing graphene oxide, a reducing agent and a buffer solution and carrying out a reaction so as to obtain a reacted solution; and 2) subjecting the reacted solution to vacuum pumping filtration and drying so as to obtain the reduced graphene oxide emulsion separating film. The film can be used for separation of a variety of nanometer / submicron oil-in-water type emulsions, has the advantages of high separation efficiency, reusability, self-supporting performance, etc. and the special infiltration property of super-hydrophilicity / underwater super-oleophobicity, is capable of resisting strong acid, weak base and high salt environments, shows good stability and can be cyclically used many times. The film is synthesized by using a mussel bionic process; raw materials are mild, nontoxic and easily available; preparation process is simple, labor-saving and time-saving; preparation of the emulsion separating film on a plurality of filter membrane substrates is realized; and large-scale production and application can be implemented.

Description

technical field [0001] The invention belongs to the field of surface modification of solid materials, and in particular relates to a reduced graphene oxide emulsion separation film and its preparation method and application. Background technique [0002] Oil products play an immeasurably important role in social development and modern life, but they also cause serious environmental pollution. One of the ubiquitous and troublesome sources of pollution—emulsified oil-in-water mixtures—has been an urgent and challenging worldwide issue due to its serious threat to the environment and human health. So far, membrane filtration technology has been widely used because of its relatively simple operation, but the inevitable surface oil pollution problem limits its wide-scale application. At present, there have been some reports on the invention of emulsion separation materials using the special wettability of solid surfaces, but most of these inventions are still helpless for emulsi...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D67/00B01D69/02B01D17/022C02F1/40C02F1/44
Inventor 冯琳刘娜张玮峰张淼曹莹泽陈雨宁林鑫许亮鑫危岩
Owner TSINGHUA UNIV
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