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Hydrophilic self-cleaning oil-water separation membrane and preparation method thereof

An oil-water separation membrane and self-cleaning technology, applied in the field of membrane separation, can solve problems such as separation flux and oil-water separation efficiency decline, membrane surface pollution, and restrictions on the development and application of membrane separation technology, and achieve good anti-pollution performance and repeatability The effect of good, good cycle stability performance

Active Publication Date: 2020-07-24
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional membrane separation materials are prone to severe membrane surface fouling during the oil-water separation process, which leads to a sharp drop in separation flux and oil-water separation efficiency, which seriously restricts the development and application of membrane separation technology in the field of oil-water separation.

Method used

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  • Hydrophilic self-cleaning oil-water separation membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Dopamine modification: soak the polyvinylidene fluoride ultrafiltration membrane in a dopamine solution of 1 g / L and pH value of 8.5 for 15 minutes, self-assemble to form a polydopamine modification layer, take it out and wash it, and obtain a dopamine-modified polyvinylidene fluoride Ultrafiltration membrane;

[0024] (2) Quantum dot deposition: the dopamine-modified ultrafiltration membrane prepared in step (1) is immersed in a 0.01% graphene oxide quantum dot aqueous suspension for 10 min, and the graphene oxide quantum dot layer is deposited on the membrane surface by means of dopamine , to prepare quantum dot deposition film;

[0025] (3) In-situ cross-linking: the quantum dot deposition film prepared in step (2) is immersed in the MES buffer solution containing EDC and NHS, the pH value is 4, the total concentration of EDC and NHS is 0.01mol / L, EDC and NHS The molar ratio of NHS is 1:1, and the hydrophilic self-cleaning oil-water separation membrane is prepar...

Embodiment 2

[0027] (1) Dopamine modification: Soak the polyvinylidene fluoride ultrafiltration membrane in a 3g / L dopamine solution with a pH value of 8.5 for 25 minutes, self-assemble to form a polydopamine modification layer, take it out and wash it, and obtain a dopamine-modified polyvinylidene fluoride Ultrafiltration membrane;

[0028] (2) Quantum dot deposition: immerse the dopamine-modified ultrafiltration membrane prepared in step (1) into a 1.0% graphene oxide quantum dot aqueous suspension for 10 min, and deposit a graphene oxide quantum dot layer on the membrane surface by means of dopamine , to prepare quantum dot deposition film;

[0029] (3) In-situ cross-linking: the quantum dot deposition film prepared in step (2) is immersed in the MES buffer solution containing EDC and NHS, the pH value is 6.5, the total concentration of EDC and NHS is 0.1mol / L, EDC and NHS The molar ratio of NHS was 3:1, and the hydrophilic self-cleaning oil-water separation membrane was prepared after...

Embodiment 3

[0031] (1) Dopamine modification: Soak the polyvinylidene fluoride ultrafiltration membrane in a 3g / L dopamine solution with a pH value of 8.5 for 20 minutes, self-assemble to form a polydopamine modification layer, take it out and wash it, and obtain a dopamine-modified polyvinylidene fluoride Ultrafiltration membrane;

[0032] (2) Quantum dot deposition: the dopamine-modified ultrafiltration membrane prepared in step (1) is immersed in a 2% graphene oxide quantum dot aqueous suspension for 30 min, and the graphene oxide quantum dot layer is deposited on the membrane surface by means of dopamine , to prepare quantum dot deposition film;

[0033] (3) In-situ cross-linking: the quantum dot deposition film prepared in step (2) is immersed in the MES buffer solution containing EDC and NHS, the pH value is 5.5, the total concentration of EDC and NHS is 0.05mol / L, EDC and NHS The molar ratio of NHS is 1:1, and after an activation reaction at room temperature for 1 h, a hydrophilic...

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Abstract

The invention relates to a hydrophilic self-cleaning oil-water separation membrane and a preparation method thereof, and belongs to the technical field of membrane separation. The base membrane of thehydrophilic self-cleaning oil-water separation membrane is a polyolefin porous membrane, and graphene oxide quantum dots are deposited on the surface of the base membrane under the assistance of dopamine and are subjected to a condensation reaction with dopamine to form a graphene oxide quantum dot hydrophilic modification layer. Under the irradiation of visible light, the graphene oxide quantumdots can degrade organic pollutants attached to the surface of the membrane and efficiently kill bacteria so that the membrane has excellent self-cleaning antifouling performance; the membrane is suitable for rapid separation of various oil-water layered mixtures and oil-in-water type emulsions with stable surface activity and has good anti-pollution performance and cycling stability.

Description

technical field [0001] The invention relates to a hydrophilic self-cleaning oil-water separation membrane and a preparation method thereof, belonging to the technical field of membrane separation. Background technique [0002] The continuous increase of industrial oily sewage and the frequent occurrence of marine oil spill accidents pose a great threat to the environment and human health. How to effectively treat oily wastewater, especially emulsified oily wastewater in complex environments, has become a problem of concern to the world. Membrane separation technology is a new type of high-efficiency separation technology. It has the advantages of no phase change and side reactions, no secondary pollution, high separation efficiency, mild operating conditions, and low energy consumption. It is widely used in seawater desalination, chemical industry, printing and dyeing, and environmental protection. , food, biochemical and other fields have been widely used. The use of memb...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D61/14B01D67/00C02F1/44C02F1/40
CPCB01D61/14B01D67/0079B01D71/34B01D2321/34B01D2325/36C02F1/40C02F1/44
Inventor 范加谊刘贝贝刘宇欣赵学志石进徐积斌张春芳
Owner JIANGNAN UNIV
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