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Lignin functionalized modified graphene and preparation method thereof

A technology of lignin and functionalization, applied in the field of lignin-functionalized modified graphene and its preparation, can solve the problems of easy agglomeration and poor dispersibility of graphene, and achieve high carbon content, excellent anti-corrosion performance, and a wide range of sources. Effect

Active Publication Date: 2018-03-20
FUZHOU UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a kind of lignin functionalized modified graphene and preparation method thereof, the obtained functionalized modified graphene has characteristics such as good dispersion stability, can solve the problems such as easy agglomeration of traditional graphene, poor dispersion, can be Used as an environmentally friendly graphene heavy-duty anti-corrosion coating

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  • Lignin functionalized modified graphene and preparation method thereof
  • Lignin functionalized modified graphene and preparation method thereof
  • Lignin functionalized modified graphene and preparation method thereof

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Embodiment 1

[0027] (1) Graphene oxide nanosheets were prepared by the improved Hummers method, and a uniform dispersion was obtained after step-by-step centrifugal washing and ultrasonic dispersion. The solid content of graphene oxide was measured to be 3.2 mg / mL;

[0028] (2) Take 17 mL (54.4 mg) of the dispersion in step (1) in 50 mL of deionized water, add 10 mg of sodium lignosulfonate, and ultrasonically disperse for 0.5 hours to obtain a lignosulfonic acid-graphene oxide mixed solution;

[0029] (3) Add 50 mg of polyaniline sulfonate to the sodium lignosulfonate-graphene oxide mixed solution obtained in step (2), stir continuously to make it fully and uniformly contact, then react at 0 °C for 6 hours, and dry to constant weight , that is, lignin functionalized modified graphene powder is obtained, and its SEM image is as follows figure 1 shown. Depend on figure 1 It can be seen that the lignin-functionalized modified graphene has good dispersion and no agglomeration phenomenon occ...

Embodiment 2

[0031] (1) Graphene oxide nanosheets were prepared by the improved Hummers method, and a uniform dispersion was obtained after step-by-step centrifugal washing and ultrasonic dispersion. The solid content of graphene oxide was measured to be 3.2 mg / mL;

[0032] (2) Take 10 mL (32 mg) of the dispersion from step (1) in 50 mL of 0.01 mol / L ammonia solution, add 5 mg of enzymatic lignin, and ultrasonically disperse for 0.5 hours to obtain enzymatic lignin-graphite oxide Alkene mixed solution;

[0033] (3) Add 30 mg of sulfonated diphenylamine polymer to the enzymatic lignin-graphene oxide mixed solution obtained in step (2), stir continuously to make it fully and uniformly contact, then react at 5 °C for 4 hours, and dry to constant temperature. Heavy, that is, to obtain lignin functionalized modified graphene powder, its SEM picture is as follows figure 2 shown. Depend on figure 2 It can be seen that the modified molecules are effectively inserted between the graphene sheet...

Embodiment 3

[0035] (1) Graphene oxide nanosheets were prepared by the improved Hummers method, and a uniform dispersion was obtained after step-by-step centrifugal washing and ultrasonic dispersion. The solid content of graphene oxide was measured to be 5 mg / mL;

[0036] (2) Take 6 mL (30 mg) of the dispersion from step (1) in 50 mL of 0.01 mol / L sodium bicarbonate solution, add 3 mg of enzymatic lignin, and ultrasonically disperse for 1 hour to obtain enzymatic lignin-oxidized Graphene mixed solution;

[0037] (3) Add 80 mg polyaniline / lignosulfonic acid complex to the enzymatic lignin-graphene oxide mixed solution obtained in step (2), stir continuously to make it fully and uniformly contact, and then react at 1 °C for 5 hours, Dry to constant weight to obtain lignin functionalized modified graphene powder, its SEM picture is as follows image 3 shown. Depend on image 3 It can be seen that the obtained lignin-functionalized modified graphene has good dispersion and no agglomeration ...

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Abstract

The invention discloses a lignin functionalized modified graphene and a preparation method thereof and belongs to the technical field of functionalized graphene material preparation. The preparation method of the lignin functionalized modified graphene disclosed by the invention comprises the steps of evenly mixing lignin with oxidized graphene to make the lignin be fully adsorbed on the surface of the oxidized graphene, then adding sulfonate polyaniline, evenly stirring and then reacting for a certain time under a certain temperature to obtain the lignin functionalized modified graphene. Thegraphene disclosed by the invention has good dispersion stability and can be utilized as an environment-friendly graphene heavy anti-corrosion coating; furthermore, the preparation method is convenient, simple, easy and practical; a novel method for preparing the functionalized graphene materials is provided.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional graphene materials, and in particular relates to a lignin functionalized modified graphene and a preparation method thereof. Background technique [0002] Graphene is a two-dimensional carbon nanomaterial formed by stacking a single layer of carbon atoms in a hexagonal honeycomb shape. It has attracted widespread attention due to its excellent mechanical properties, electrical properties and chemical stability, and has been widely used in the field of anti-corrosion coatings. . Graphene has a special lamellar structure, which can be used as a filler in anti-corrosion coatings like scaly mica powder, aluminum powder, glass flakes, etc., and acts as a physical barrier to prevent the penetration of oxygen and corrosive media, making the anti-corrosion coating The penetration performance is reduced and the corrosion resistance of the coating is improved. The application of graphene...

Claims

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Application Information

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IPC IPC(8): C01B32/184C01B32/194C09D5/08C09D1/00
Inventor 吕秋丰王书豪詹红兵许超
Owner FUZHOU UNIV
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