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Method for preparing hydrophilic/oleophobic oil-water separation stainless steel net films

An oil-water separation, stainless steel mesh technology, applied in separation methods, liquid separation, semi-permeable membrane separation, etc., can solve the problems of membrane surface and pore fouling, blocking water flux, low separation efficiency, poor stability, etc. High separation effect, adjustable aperture effect

Active Publication Date: 2016-09-28
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the current oil-water separation problems such as low separation efficiency, poor stability, easy fouling and clogging of the membrane surface and channels, resulting in reduced water flux, the purpose of the present invention is to provide a hydrophilic / hydrophobic membrane with large flux and strong stability. Oil-type oil-water separation stainless steel mesh and preparation method thereof

Method used

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  • Method for preparing hydrophilic/oleophobic oil-water separation stainless steel net films
  • Method for preparing hydrophilic/oleophobic oil-water separation stainless steel net films
  • Method for preparing hydrophilic/oleophobic oil-water separation stainless steel net films

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preparation example Construction

[0031] (2) Preparation of zwitterionic polymers containing active esters;

[0032] (3) With stainless steel mesh as the substrate and polydopamine as the mediating layer, the active ester group of the zwitterionic polymer and the amino group of polydopamine undergo amidation reaction to construct a hydrophilic / oleophobic oil-water separation membrane.

Embodiment 1

[0034] Example 1 Construction of polydopamine mediation layer by spraying method

[0035] (1) Use acetone and absolute ethanol to ultrasonically clean the 1000-mesh (pore size 13 μm) stainless steel mesh to be modified in an ultrasonic cleaner for 15 minutes, then ultrasonically clean it with 5% sodium hydroxide solution for 15 minutes, and then use Rinse with deionized water, dry with nitrogen gas for later use;

[0036] (2) Under the condition of pH=6.8, prepare a dopamine solution containing ammonium persulfate, the concentration of ammonium persulfate is 2 mg / mL, and the concentration of dopamine is 4 mg / mL;

[0037] (3) Evenly spray the prepared dopamine solution on the surface of the stainless steel mesh to be modified;

[0038] (4) Place the sprayed stainless steel mesh in a water vapor atmosphere at a heating temperature of 120°C and a heating time of 4 h to speed up the construction of the polydopamine-mediated layer;

[0039] (5) Rinse the surface of the stainless ...

Embodiment 2

[0040] Example 2 Construction of polydopamine mediation layer by dip coating method

[0041] (1) Clean the 1000-mesh (pore size 13 μm) stainless steel mesh to be modified with acetone and absolute ethanol in an ultrasonic cleaner for 15 minutes, then ultrasonically clean it with 5% sodium hydroxide solution for 15 minutes, and then Rinse with deionized water and dry with nitrogen gas for later use;

[0042] (2) Under the condition of pH=7.8, prepare a dopamine solution containing ammonium persulfate, the concentration of ammonium persulfate is 1 mg / mL, and the concentration of dopamine is 2 mg / mL;

[0043] (3) Immerse the stainless steel mesh in the above-prepared dopamine solution for 4 h;

[0044] (4) After 4 hours, the stainless steel mesh was taken out of the dopamine solution and heated at 140°C for 1 hour;

[0045] (5) Rinse the surface of the stainless steel mesh and the polydopamine that is not firmly combined with the mesh with distilled water.

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Abstract

The invention relates to a method for preparing hydrophilic / oleophobic oil-water separation stainless steel net films. Stainless steel nets are used as bases. The method includes constructing a poly-dopamine medium layer on the surface of each stainless steel net in dip-coating or spraying modes; dipping the stainless steel nets with the poly-dopamine medium layers in zwitter-ionic polymers with active ester groups; or spraying the zwitter-ionic polymers with the active ester groups on the surfaces and meshes of the stainless steel nets with the poly-dopamine medium layers; carrying out amidation coupling reaction on the zwitter-ionic polymers and each poly-dopamine medium layer to form a stable hydrophilic polymer film on the surface and the meshes of the corresponding stainless steel net. The method has the advantages that the hydrophilic / oleophobic oil-water separation stainless steel net films prepared by the aid of the method are super-hydrophilic and are high in water flux, stable in structural performance and high in anti-pollution capacity; the method has a broad application prospect in the aspects of recycling marine oil slick, removing water from crude oil, treating oily sewage and the like.

Description

technical field [0001] The invention relates to a hydrophilic / oleophobic oil-water separation stainless steel omentum and a preparation method thereof, in particular to using polydopamine as a mediator layer to generate zwitterionic polymers containing active ester groups and polydopamine mediator layer The amidation reaction enables the zwitterionic polymer to be stably covalently bonded to the surface of the stainless steel mesh. Background technique [0002] The oil-water separation process includes the separation of oily wastewater and aqueous oil. Oily wastewater has a wide range of sources and a large content. A large amount of oily wastewater is produced in the petroleum industry, manufacturing industry, transportation, food and catering and other industries. The sources of oily wastewater in the petroleum industry mainly include the process of exploration and development, crude oil pipeline transportation, oil tanker leakage, discharge, and accidents; spills and bl...

Claims

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Application Information

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IPC IPC(8): B01D17/022B01D67/00B01D69/02B01D71/60B01D71/56
CPCB01D17/02B01D67/0006B01D69/02B01D71/56B01D71/60B01D2325/36
Inventor 宫永宽孟凡宁
Owner NORTHWEST UNIV
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