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Preparation method of graphene oxide composite nano-filtration membrane

A graphene composite and nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effect of simple and easy operation, high water flux and separation performance

Active Publication Date: 2017-06-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, however, there is no research on the direct use of graphene oxide / modified graphene oxide materials as interfacially polymerized monomers to prepare composite films.

Method used

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  • Preparation method of graphene oxide composite nano-filtration membrane
  • Preparation method of graphene oxide composite nano-filtration membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1, prepare graphene oxide composite nanofiltration membrane, the steps are as follows:

[0018] Step 1. Preparation of polyethersulfone base membrane: dissolve polyethersulfone in N,N-dimethylformamide to prepare a casting solution containing polyethersulfone with a mass concentration of 15-18%, and stir at 60°C 4h, and stand at 60°C for 4h defoaming, after cooling to room temperature, pour the casting solution on a glass plate to scrape the film, put it in a water bath at 25°C to solidify to form a film, remove it from the glass plate and wash it with deionized water Soak for 24 hours to obtain polyethersulfone base membrane;

[0019] Step 2, preparation of aminated graphene oxide: adding sodium hydroxide to the graphene oxide solution with a mass fraction of 0.1% to make the concentration reach 0.04%, and ultrasonically dispersing the mixed solution for 3 hours. Add hydrochloric acid to the above mixed solution until the pH value is neutral, then centrifug...

Embodiment 2

[0022] Embodiment 2, preparation of graphene oxide composite nanofiltration membrane, its preparation process is basically the same as embodiment 1, the only difference is: in step 3, the obtained polyethersulfone base membrane is soaked in the aqueous solution of aminated graphene oxide, its amino The mass fraction of the graphene oxide aqueous solution was changed from 0.00005% to 0.0005%, and finally the graphene oxide composite nanofiltration membrane 2 was obtained.

[0023] The water flux of the graphene oxide composite nanofiltration membrane 2 prepared in embodiment 2 under 0.2MPa operating pressure is 27.8L / (m 2 h), the rejection rate of sodium orange (mass fraction 0.01%) aqueous solution is 93.6%. figure 1 It is a diagram of the rejection rate of graphene oxide composite nanofiltration membrane 2 against aqueous solutions of sodium orange, Congo red, and methyl blue (both mass fractions are 0.01%).

Embodiment 3

[0024] Embodiment 3, preparing graphene oxide composite nanofiltration membrane, its preparation process is basically the same as embodiment 1, the only difference is: in step 3, the obtained polyethersulfone base membrane is soaked in the aqueous solution of aminated graphene oxide, and its amino The mass fraction of the graphene oxide aqueous solution was changed from 0.00005% to 0.001%, and finally the graphene oxide composite nanofiltration membrane 3 was obtained.

[0025] The water flux of the graphene oxide composite nanofiltration membrane 3 prepared in embodiment 3 under 0.2MPa operating pressure is 25.5L / (m 2 h), the rejection rate of sodium orange yellow (mass fraction 0.01%) aqueous solution is 95.0%.

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Abstract

The invention discloses a preparation method of a graphene oxide composite nano-filtration membrane. The method mainly comprises the following steps: preparing a polyethersulfone ultra-filtration base membrane by adopting a phase inversion method; carrying out surface grafting to prepare aminated graphene oxide; sequentially immersing the polyethersulfone ultra-filtration base membrane into a low-concentration water-phase monomer aminated graphene oxide and organic monomer trimesoyl chloride solution; carrying out interface polymerization to prepare the graphene oxide composite membrane. The preparation method disclosed by the invention has the advantages that the aminated graphene oxide is used for carrying out the interface polymerization of a water-phase monomer and a process is simple and easy to operate; compared with a polyamide separation membrane prepared by a traditional interface polymerization method, a separation layer of the prepared graphene oxide composite membrane is very thin and the graphene oxide composite membrane has relatively high water flux and separation performance under relatively low operation pressure (0.2MPa).

Description

technical field [0001] The invention relates to a preparation method of a graphene oxide composite membrane, belonging to the technical field of composite membrane preparation. Background technique [0002] Nanofiltration technology is a pressure-driven membrane separation technology whose separation accuracy is between reverse osmosis and ultrafiltration. The pore size of nanofiltration membrane is 0.5-2nm, its operating pressure is usually 0.3-1.0MPa, and the molecular weight cut-off is 200- 1000 range. Compared with reverse osmosis, nanofiltration membranes have higher water flux at lower operating pressures and higher rejection rates for divalent ions and small organic molecules. Nanofiltration membranes are widely used in the desalination of brackish water, printing and dyeing wastewater treatment, biochemical preparations and pharmaceutical purification and other fields. [0003] At present, nanofiltration membranes are classified into two types: asymmetric membranes...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/06B01D67/00B01D61/02
CPCB01D61/027B01D67/0002B01D69/12B01D71/021B01D71/06
Inventor 姜忠义张润楠贺明睿刘亚楠苏延磊
Owner TIANJIN UNIV
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