Preparation method of graphene hydrogel and application of the graphene hydrogel

A graphene hydrogel and graphene technology, applied in the direction of graphene, nano-carbon, etc., can solve the problems that the excellent performance of the material cannot be effectively exerted, the specific surface area of ​​graphene is reduced, and the stacking of nano-agglomerated sheets is achieved. It is suitable for large-scale commercial production, improves the adsorption effect, and has the effect of simple and easy process

Inactive Publication Date: 2015-07-08
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the graphene prepared by conventional methods is in the form of ultrafine powder, problems such as agglomeration and uneven distribution will occur during use due to size effects, surface inertia, etc., resulting in the excellent performance of the material itself not being effectively utilized.
At the same time, due to the large van der Waals force between graphene sheets, serious nano-agglomeration and sheet stacking occur between layers, w

Method used

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  • Preparation method of graphene hydrogel and application of the graphene hydrogel
  • Preparation method of graphene hydrogel and application of the graphene hydrogel
  • Preparation method of graphene hydrogel and application of the graphene hydrogel

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Embodiment 1

[0031] The method of the invention adopts a chemical reduction method under mild water-bath reaction conditions to reduce graphene oxide so that self-assembly occurs to form graphene hydrogel.

[0032] Graphite oxide is dissolved in water, ultrasonic 12 hours, graphite oxide is separated into the graphene oxide solution that uniform and stable concentration is 1mg / mL; In the graphene oxide solution of gained, according to graphene oxide and reducing agent mass ratio is 1: 1 Add the reducing agent ascorbic acid, ultrasonically disperse for 2 hours, so that the reducing agent and the graphene oxide solution are evenly mixed; divide into beakers according to a certain amount, seal with a parafilm, and put them into a water bath, and control the temperature of the water bath to 70°C , the heating time is 10 hours; after the reduction reaction process is finished, the product is taken out, the obtained graphene hydrogel is soaked in distilled water, and the water is constantly chang...

Embodiment 2

[0034] Graphite oxide is dissolved in water, ultrasonic 10 hours, graphite oxide is separated into the graphene oxide solution that uniform and stable concentration is 2mg / mL; In the graphene oxide solution of gained, according to graphene oxide and reducing agent mass ratio is 1: 1 Add the reducing agent ascorbic acid, ultrasonically disperse for 4 hours, so that the reducing agent and the graphene oxide solution are evenly mixed; according to a certain amount, they are divided into beakers, sealed with a parafilm, and put into a water bath, and the temperature of the water bath is controlled at 75°C , the heating time is 10 hours; after the reduction reaction process is finished, the product is taken out, the obtained graphene hydrogel is soaked in distilled water, and the water is constantly changed for washing to obtain the desired product. The field emission scanning electron microscope picture is as follows figure 2 as shown, figure 2 It is a field emission scanning el...

Embodiment 3

[0037] Graphite oxide is dissolved in water, ultrasonic 4 hours, graphite oxide is separated into the graphene oxide solution that uniform and stable concentration is 4mg / mL; In the graphene oxide solution of gained, according to graphene oxide and reducing agent mass ratio is 3: 1 Add the reducing agent glutathione, ultrasonically disperse for 1.5 hours, so that the reducing agent and the graphene oxide solution are evenly mixed; divide into beakers according to a certain amount, seal with a sealing film, and put them in a water bath to control the temperature of the water bath The temperature is 80°C, and the heating time is 14 hours; after the reduction reaction process is completed, the product is taken out, the obtained graphene hydrogel is soaked in distilled water, and the water is changed continuously for washing to obtain the desired product.

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Abstract

The invention discloses a preparation method of graphene hydrogel, which includes following steps: adding a reducing agent to a graphene oxide solution for ultrasonic dispersion; heating the reaction system to carry out a reaction; and washing a reaction product after the reaction finished to obtain the graphene hydrogel. In the invention, a macroscopic form material, graphene hydrogel, in a three-dimensional network structure is assembled and formed with the graphene as a framework, so that problems of nano agglomeration and layer stacking among the layers of the graphene, thereby greatly increasing the specific surface area of the material and enhancing the adsorption effect of the material. The preparation method is easy to perform, is carried out with common reducing agents and under relative mild conditions to prepare the graphene hydrogel in a reduction manner, is decreased in preparation cost, is free of environmental pollution, is free of obviously dangerous raw materials and is suitable for large-scale commercialized production.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and relates to a method for preparing graphene hydrogel with high adsorption capacity for antibiotics by chemical reduction under mild conditions. Background technique [0002] Graphene (GO), as a popular emerging material, has excellent electrical and thermal conductivity, super mechanical properties, high stability and large specific surface area, and has attracted widespread attention worldwide. In recent years, with the continuous advancement of science and technology, the process of mass production of graphene has become more mature and its cost has become lower. The high specific surface area and mature production technology make graphene a potentially efficient adsorbent. Because graphene prepared by conventional methods is in the form of ultrafine powder, problems such as agglomeration and uneven distribution may occur during use due to size effects, surface inertia, etc., resu...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/184
Inventor 马杰杨明轩陈君红庄媛沈威李程
Owner TONGJI UNIV
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