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Preparation method and use of polydopamine-graphene hydrogel adsorbent

A technology of graphene hydrogel and polydopamine, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve the problems of harsh preparation conditions, high reaction temperature, and dangerous experimental conditions, and achieve the goal of preparation The effect of short time, simple preparation process and low cost

Inactive Publication Date: 2019-01-11
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In the prior art, the hydrothermal method is mainly used to self-assemble the dispersion of graphene oxide into the first type of graphene hydrogel. However, the reaction temperature required in the preparation process of the hydrothermal method is relatively high, and a special hydrothermal reaction is required. Kettle equipment, harsh preparation conditions, and dangerous experimental conditions

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  • Preparation method and use of polydopamine-graphene hydrogel adsorbent
  • Preparation method and use of polydopamine-graphene hydrogel adsorbent

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preparation example Construction

[0026] Describe the embodiment of the present invention in detail below, the present invention provides a kind of preparation method of polydopamine-graphene hydrogel adsorbent on the one hand, comprise the steps:

[0027] (1) Graphene oxide and hydrazine hydrate solution are stirred and ultrasonically dispersed to obtain a uniform mixed solution;

[0028] (2) Add buffer reagent to the mixed solution of step (1), and continue to stir the mixed solution;

[0029] (3) Add dopamine hydrochloride to the mixed solution in step (2), continue to stir the mixed solution, heat-preserve at 60-80° C. for 8-10 hours, and post-process to obtain polydopamine-graphene hydrogel.

[0030] In the hydrazine hydrate system of the present invention, polydopamine is used as a guiding agent, and graphene is used as a main material.

[0031] Preferably, the volume fraction of the hydrazine hydrate solution is 80%, and the mass volume ratio (g / L) of graphene oxide to the described hydrazine hydrate s...

Embodiment 1

[0042] S11 weighs 0.08 g of graphene oxide prepared by the Hummers method and places it in a container;

[0043] S12 Prepare 40ml of hydrazine hydrate solution with a volume fraction of 80%, and add it into the container in step S11, stir at room temperature for 10 minutes, and then ultrasonically disperse for 10 minutes;

[0044] S13 Weigh 0.03 g of Tris in S12 and add it into the container, and stir again for 5 minutes;

[0045] S14 Weigh 0.0375g of dopamine hydrochloride into the container in S13, and stir at room temperature for 5 minutes;

[0046] S15 put the solution in step S14 into a 10mL beaker, add 8mL of the solution into the beaker, seal it with a plastic wrap, and put the sealed small beaker into a blast drying oven at 60°C for heat preservation for 8h;

[0047] S16 Take out the small beaker after the heat preservation treatment in step S15, carefully filter out the liquid in the beaker, wash with distilled water for 3 to 5 times, and prepare the polydopamine-gra...

Embodiment 2

[0049] S21 weighs 0.12 g of graphene oxide prepared by the Hummers method and places it in a container;

[0050]S22 Prepare 100ml of hydrazine hydrate solution with a volume fraction of 80%, add it to the container in step S21, stir for 10 minutes, and then ultrasonically disperse for 10 minutes;

[0051] S23 Weigh 0.075g of Tris in S22 and add it into the container in S22, and stir again for 5 minutes;

[0052] S24 Weigh 0.0563g of dopamine hydrochloride into the container in step S23, and stir for 5 minutes;

[0053] S25 put the solution in step S24 into a 10mL beaker, add 8mL of the solution into the beaker, seal it with a plastic wrap, and put the sealed small beaker into a blast drying oven at 60°C for heat preservation for 8 hours;

[0054] S26 Take out the small beaker after the heat preservation treatment in step S25, carefully filter out the liquid in the beaker, and wash with distilled water for 3 to 5 times to prepare the polydopamine-graphene hydrogel.

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Abstract

The invention provides a preparation method and use of a polydopamine-graphene hydrogel adsorbent. The preparation method comprises: (1) stirring graphene oxide and a hydrazine hydrate solution at thenormal temperature and ultrasonically dispersing the mixture to obtain a uniform mixed solution, (2) adding a buffering reagent into the mixed solution in the step (1), and stirring the mixed solution, and (3) adding dopamine hydrochloride into the mixture in the step (2), stirring the mixture, and carrying out thermal insulation treatment at 60-80 DEG C for 8-10h to obtain polydopamine-graphenehydrogel. The polydopamine-graphene hydrogel adsorbent can be synthesized under normal pressure through one process. The polydopamine-graphene hydrogel has stable physical and chemical properties, a high specific surface area, a strong adsorption capacity and stable recycling adsorption performances. The preparation method is suitable for large-scale production and can be used for treating industrial wastewater.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a preparation method and application of a polydopamine-graphene hydrogel adsorbent. Background technique [0002] Graphene is composed of a single layer of carbon atoms, and its thickness is only 0.33 nanometers, which is the thinnest material that humans can prepare under the development of current technology. Each carbon atom and other adjacent carbon atoms exhibit a honeycomb planar hexagonal structure in the form of sp2 hybridization. It is the only known atomic crystal with a two-dimensional free state that can exist stably. However, not all single-layer graphene structures are perfectly flat, as the nanoscale exhibits somewhat corrugated monolayer structures. Two-dimensional graphene can form allotropes of other carbon elements. For example, two-dimensional graphene curls can form one-dimensional cylindrical carbon nanotubes and zero-dimensional spherical fullerene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/38
CPCB01J20/26B01J20/30C02F1/285C02F2101/308C02F2101/38
Inventor 阳国强颜鲁婷吴梦刘格旭贺膺丹
Owner BEIJING JIAOTONG UNIV
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