Preparation method and application of graphene oxide separation membrane

A technology of graphene dispersion and separation membrane, which is applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of unsuitability for industrial scale production, degradation of separation performance, thick film thickness, etc., and achieve good results Socio-economic benefits and value, great commercial value, effect of controllable area

Inactive Publication Date: 2017-11-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The suction filtration method has disadvantages such as long time-consuming, low efficiency and thick film formation, so it is not suitable for industrial scale production
In addition, the graphene oxide separation membrane prepared by the traditional method has poor structural stability
Due to the structural characteristics of graphene oxide itself, rich oxygen-containing functional groups and hydrophilicity, the membrane structure in the aqueous phase is poor in stability, prone to self-decomposition and redispersion in solvents, resulting in degradation of its separation performance
The stability of graphene oxide separation membranes can be improved through subsequent treatments such as thermal reduction and polymer crosslinking, but there are disadvantages such as complex modification process and unsatisfactory separation performance.

Method used

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  • Preparation method and application of graphene oxide separation membrane
  • Preparation method and application of graphene oxide separation membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Preparation of graphene oxide dispersion:

[0026] Disperse the graphene oxide powder prepared above in deionized water, ultrasonically disperse, and prepare a 0.1 g / L graphene oxide dispersion

[0027] 2) Preparation of graphene oxide separation membrane

[0028] Take 5μl of the graphene oxide dispersion and add it to 400ml of deionized water, at a cross-flow pressure of 1bar, a cross-flow flow rate of 0.35LPM, and an effective membrane area of ​​3.14cm 2 , PC membrane with a pore size of 200nm, cross-flow membrane formation for 15min, and an ultra-thin graphene oxide separation membrane was prepared.

Embodiment 2

[0030] 1) Preparation of graphene oxide dispersion:

[0031] Disperse the graphene oxide powder prepared above in deionized water, ultrasonically disperse, and make a 0.4g / L graphene oxide dispersion;

[0032] 2) Preparation of graphene oxide separation membrane:

[0033] Take 5μl of the graphene oxide dispersion and add it to 400ml of deionized water, at a cross-flow pressure of 1bar, a cross-flow flow rate of 0.35LPM, and an effective membrane area of ​​3.14cm 2 , PC membrane with a pore size of 200nm, cross-flow membrane forming method for 30min, and an ultra-thin graphene oxide separation membrane was prepared. Such as figure 1 with 2 As shown, the thickness of the GO separation membrane is 10 nm.

Embodiment 3

[0035] 1) Preparation of graphene oxide dispersion:

[0036] Disperse the graphene oxide powder prepared above in deionized water, ultrasonically disperse, and make a 0.4g / L graphene oxide dispersion;

[0037] 3) Preparation of graphene oxide separation membrane:

[0038] Take 500 μl of graphene oxide dispersion and add it to 400ml of deionized water. At cross-flow pressure of 1 bar, cross-flow flow rate of 0.35 LPM, effective membrane area of ​​3.14 cm 2 , PC membrane with a pore size of 200nm, and a cross-flow membrane forming method for 5 minutes to prepare an ultra-thin graphene oxide separation membrane.

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Abstract

The invention discloses a preparation method of a graphene oxide separation membrane. The preparation method comprises the following steps: dispersing graphene oxide powder in deionized water and preparing the graphene oxide separation membrane with high stability through a cross-flow method. Through controlling the consumption of graphene oxide, the cross-flow separation membrane forming conditions and the effective membrane forming area, the thickness-controllable separation membrane can be obtained. The preparation method disclosed by the invention has the benefits that the ultra-thin graphene oxide separation membrane is creatively prepared by utilizing the cross-flow method, and through the membrane forming process, the stability of the graphene oxide separation membrane in a water phase is enhanced; by utilizing the separation selectivity of the graphene oxide separation membrane, the efficient separation of a mixed dye is realized; the preparation method is the graphene oxide separation membrane forming process which is simple, low in cost and capable of large-scale production. The preparation method disclosed by the invention overcomes the defects of instable structure, too large film thickness and the like of the graphene oxide separation membrane, shows excellent separation performance in dry separation and is huge in industrial prospect.

Description

technical field [0001] The invention relates to a preparation method and application of a graphene oxide separation membrane, in particular to a preparation method of a graphene oxide separation membrane with adjustable thickness, high stability and suitable for large-scale production, and its application in the separation of mixed dyes. Background technique [0002] Graphene oxide, as a derivative of carbon, has been a research hotspot in academia and industry since its discovery, and has outstanding performance in various fields. Due to its special two-dimensional layered structure, strong mechanical properties and excellent film-forming properties, graphene oxide is an ideal separation membrane material in the fields of gas separation and purification, seawater desalination, ion channel research and DNA detection. Has potential application prospects. [0003] At present, the traditional preparation methods of graphene oxide separation membranes include suction filtration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D71/48B01D67/00
Inventor 彭新生应玉龙
Owner ZHEJIANG UNIV
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