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Hybrid composite membrane, preparation method and application thereof

A hybrid composite and compound technology, which is applied in the field of membrane separation, can solve the problems of low flux of solvent-resistant nanofiltration membranes, incompatibility, poor solvent resistance, etc., to improve stability and separation performance, improve flux, and improve affinity. The effect of water improvement

Active Publication Date: 2019-06-25
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims at the technical problems existing in the prior art that the nanofiltration membrane cannot be used universally in the aqueous solution system and the organic solution system, the flux of the solvent-resistant nanofiltration membrane is low, and the solvent resistance is poor, and a hybrid composite membrane is proposed. Method and application thereof, the prepared hybrid composite membrane has good solvent resistance and high flux, and high organic dye removal rate, meanwhile, the prepared hybrid composite membrane also has good divalent Salt separation performance and high water flux

Method used

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  • Hybrid composite membrane, preparation method and application thereof
  • Hybrid composite membrane, preparation method and application thereof
  • Hybrid composite membrane, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0089] After mixing the graphene oxide suspension aqueous solution with a concentration of 2 mg / L and ethylenediamine, it was ultrasonicated for 30 minutes, and then cross-linked at room temperature for at least 12 hours, and set aside.

[0090] The average sheet diameter of the GO is 500nm, and the average thickness is 2nm.

[0091] The film making steps are as follows:

[0092] Step 1: After fully contacting the base film with a polyethyleneimine solution with a concentration of 0.1wt% at 70°C for 30s, remove the modifier remaining on the surface of the base film, and dry it for 60s, then mix with the cross-linked graphene oxide Suspended aqueous solution is fully contacted for 60s, the free suspension on the surface of the membrane is removed, and dried to obtain a modified basement membrane;

[0093] Step 2: After fully contacting the modified basement membrane obtained in step 1 with the aqueous phase monomer solution for 120s, remove the aqueous phase monomer solution o...

Embodiment 2

[0098] The only difference from Example 1 is that the obtained cross-linked hybrid composite nanofiltration membrane containing a cross-linked graphene oxide intermediate layer was activated in activating reagent DMF at 80°C for 30min.

[0099] All other steps are the same as in Example 1; the test conditions are the same as in Example 1.

[0100] The prepared hybrid composite nanofiltration membrane has a retention rate of up to 97.49% to sodium sulfate, and the flux of water is 55.85LMH, which is much higher than that of the comparative example. Compared with Example 1, both the flux and the retention rate have been improved. The significant increase shows that the activation process dissolves some short-chain molecules and rearranges long-chain molecules, which greatly improves the separation performance of the membrane.

[0101] It can be seen that the present invention has achieved remarkable technical effects and progress.

Embodiment 3

[0103] The difference from Example 1 is that in step 1, the polyimide base film is fully contacted with 0.1wt% polyethyleneimine at 25°C for 30s.

[0104] All other steps are identical with embodiment 1; Test condition is identical with comparative example.

[0105] The average thickness of the separated cortex is 20nm, and the average roughness is 1.99nm.

[0106] The prepared hybrid composite nanofiltration membrane has a rejection rate of 96.69% for rhodamine B, and a flux of ethanol of 43.44LMH, which is much higher than that of the comparative example.

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Abstract

The invention discloses a hybrid composite membrane, a preparation method and application of the prepared hybrid composite membrane. The preparation method of the hybrid composite membrane comprises an interface polymerization step, a polyamine modification step, a chemical crosslinking step and a solvent activation step. According to the invention, low-concentration interfacial polymerization iscarried out on a graphene oxide intermediate layer, so that the flux and solvent resistance of the membrane are obviously improved. Because the graphene oxide intermediate layer has a large number ofoxygen-containing functional groups, the hydrophilicity of a base membrane is greatly increased, the interfacial polymerization process of low-concentration monomers is regulated and controlled, the crosslinking degree of an interfacial separation layer is enhanced, and the solvent resistance of the membrane is improved. By adopting the low concentration monomer interfacial polymerization, the surface roughness of the membrane can be effectively improved. The hybrid composite membrane has simple preparation process and good application prospect in the field of organic solvent system separationand water treatment containing organic solvents.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a hybrid composite membrane, a preparation method and an application thereof. Background technique [0002] Seawater desalination is a necessity for the survival and development of human beings. In recent years, with the rapid increase of population and the continuous acceleration of industrialization, social problems such as resource shortage and environmental pollution have become increasingly serious, which has largely caused the limited of freshwater resources are being destroyed by over-consumption and pollution. The pollution of fresh water resources and the shortage of safe drinking water have become one of the main reasons for the outbreak of vicious infectious diseases, which makes human beings suffer from health threats and at the same time, the spread of panic leads to increased social instability, which directly restricts and threatens Progres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/64B01D71/58B01D71/02B01D69/12B01D67/00C02F1/44
Inventor 苏保卫李艳阳韩力辉
Owner OCEAN UNIV OF CHINA
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