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Self-supported graphene hydrogel membrane and preparation method thereof

A graphene hydrogel and self-supporting technology, which is applied in the field of hydrogel membrane and its preparation, can solve the problems of structural damage, limited suction filtration equipment, and inability to obtain large areas, and achieves low cost, simple process, The effect of good conductivity

Active Publication Date: 2015-01-07
ZHEJIANG TANGUSHANGXI MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is limited by the size of the suction filtration equipment and cannot obtain large-area graphene hydrogel membranes
In addition, the graphene hydrogel membranes prepared by the suction filtration method are all based on other membrane materials, and the structure will be destroyed during the process of peeling them off.

Method used

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  • Self-supported graphene hydrogel membrane and preparation method thereof
  • Self-supported graphene hydrogel membrane and preparation method thereof
  • Self-supported graphene hydrogel membrane and preparation method thereof

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preparation example Construction

[0023] The preparation method of self-supporting graphene hydrogel film comprises the following steps:

[0024] 1) Mix 1 part by weight of graphene oxide and 50-200 parts by weight of water, and ultrasonically disperse to obtain an aqueous dispersion of graphene oxide;

[0025] 2) Extrude the aqueous dispersion of graphene oxide obtained in step 1) into the coagulation liquid at an extrusion speed of 10-1000 mL / h in a device with a straight die, and solidify into graphite oxide after staying for 1-100 seconds ene hydrogel film;

[0026] 3) 1 part by weight of the graphene oxide hydrogel film obtained in step 2) is chemically reduced with 1 to 200 parts by weight of a reducing agent at 60 to 120 ° C for 1 min to 24 hours, and then washed with water to obtain self-supporting graphite ene hydrogel film; or put 1 part by weight of the graphene oxide hydrogel film obtained in step 2) into a hydrothermal kettle for hydrothermal reduction at 120-250°C for 1-36h, and then wash with w...

Embodiment 1

[0033] 1) The graphene oxide of 1 weight part, the water of 50 weight parts are mixed, obtain the aqueous dispersion liquid of 20mg / mL graphene oxide after ultrasonic dispersion;

[0034] 2) Extrude the aqueous dispersion obtained in step 1) into the coagulation liquid in a device with an inline die at an extrusion speed of 10 mL / h, and stay for 1 second to solidify into a graphene oxide hydrogel film;

[0035] 3) 1 part by weight of the graphene oxide hydrogel film obtained in step 2) is chemically reduced with 1 part by weight of hydrazine at 95°C for 1 hour, soaked in deionized water for 24 hours, and the graphene hydrogel film is taken out , to obtain a self-supporting graphene hydrogel membrane.

[0036] After the above steps, the self-supporting graphene hydrogel film has a thickness of 1000 μm, a water content of 100%, and a conductivity of 0.2×10 7 S / m, the tensile strength is 80MPa.

Embodiment 2

[0038] 1) The graphene oxide of 1 weight part, the water of 200 weight parts are mixed, obtain the aqueous dispersion liquid of 5 mg / mL graphene oxide after ultrasonic dispersion;

[0039] 2) Extrude the aqueous dispersion obtained in step 1) into the coagulation liquid in an inline die device at an extrusion speed of 1000 mL / h, and solidify into a graphene oxide hydrogel film after staying for 1 second;

[0040] 3) 1 part by weight of the graphene oxide hydrogel film obtained in step 2) is chemically reduced with 10 parts by weight of hydroiodic acid at 95° C. for 1 hour, soaked in deionized water for 12 hours, taken out, and then deionized Soaking in water for 12 hours was repeated 3 times to obtain a self-supporting graphene hydrogel film.

[0041] After the above steps, the self-supporting graphene hydrogel film has a thickness of 100nm, a water content of 70%, and a conductivity of 0.5×10 9 S / m, the tensile strength is 120MPa.

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Abstract

The invention discloses a self-supported graphene hydrogel membrane and a preparation method thereof. The preparation method comprises the following steps: 1) mixing 1 part of graphene oxide and 50-200 parts of water, and carrying out ultrasonic dispersion to obtain an aqueous dispersion of the graphene oxide; 2) extruding the aqueous dispersion of the graphene oxide obtained in the step 1) into solidified liquid in a horizontal die device at the extrusion speed of 10-1,000mL / h, and solidifying to form a graphene oxide hydrogel membrane; and 3) carrying out chemical reduction on 1 part of graphene oxide hydrogel membrane obtained in the step 2) by using 1-200 parts of a reducing agent, and cleaning by water to obtain the self-supported graphene hydrogel membrane. The self-supported graphene hydrogel membrane is simple and convenient in method, simple in process, low in energy consumption, green and environment-friendly; the obtained self-supported graphene hydrogel membrane is good in toughness, high in strength, adjustable in thickness and size, and regular in microstructure, and can be applied to the fields such as biological drug loading and catalysis.

Description

technical field [0001] The invention relates to a hydrogel film and a preparation method thereof, in particular to a self-supporting graphene hydrogel film and a preparation method thereof. Background technique [0002] Graphene is a layer of carbon atoms with sp 2 Two-dimensional materials formed by connecting hybrid phases. Since 2004 by A. K. Geim (K. S. Novoselov, et al. Science, 2004, 306 , 666-669) discovery has aroused widespread concern in the scientific and industrial circles. As a macroscopic graphene assembly, graphene hydrogel film has great application potential in the fields of biomedicine and electrode materials. So far, graphene hydrogel membranes have been obtained by suction filtration of graphene dispersions. This method is limited by the size of the suction filtration equipment and cannot obtain large-area graphene hydrogel membranes. In addition, the graphene hydrogel membranes prepared by the suction filtration method are all based on other membra...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 高超寇亮刘峥
Owner ZHEJIANG TANGUSHANGXI MATERIAL SCI & TECH
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