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A kind of cs-cncs multi-layer modified membrane contaminated with antigen oil and its preparation method and application

A technology of oil pollution and modification, applied in the field of membrane materials, can solve the problems of energy consumption, pollution of filter membrane, difficult recovery, etc., and achieve the effect of high efficiency separation and low cost

Active Publication Date: 2022-08-02
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most membranes must be pre-wet to avoid fouling the membrane with oil
Once these membranes come into contact with oil before being pre-wetted with water, fouling occurs and is difficult to recover, requiring additional energy consumption

Method used

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  • A kind of cs-cncs multi-layer modified membrane contaminated with antigen oil and its preparation method and application
  • A kind of cs-cncs multi-layer modified membrane contaminated with antigen oil and its preparation method and application
  • A kind of cs-cncs multi-layer modified membrane contaminated with antigen oil and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A multi-layer modified film of CS-CNCs contaminated with antigen oil is prepared by the following steps:

[0046] (1) Cut the 2000-mesh stainless steel mesh into small pieces of 3 × 3 cm, and then ultrasonically clean it in acetone, ethanol and deionized water for 5 minutes to remove the dirt and impurities on the surface of the stainless steel mesh, and then dry it in a vacuum oven at 60 °C , get a clean stainless steel mesh.

[0047] (2) Prepare a piranha solution, put the clean stainless steel mesh obtained in step (1) into the piranha solution, then react at 60°C for 3 hours, take it out after the reaction is completed, and rinse the stainless steel mesh with water to neutrality , and dried at 60 °C to obtain a surface hydroxylated stainless steel mesh.

[0048] (3) CS powder was added to 1 wt.% glacial acetic acid solution to obtain 0.2 wt.% CS solution, and a homogeneous solution was prepared by magnetic stirring for 6 hours; 0.2 wt.% CS solution was obtained by ...

Embodiment 2

[0064] Different from Example 1, the meshes of the four stainless steel meshes prepared in this example are 500 meshes, 800 meshes, 1000 meshes, and 2500 meshes, respectively, and the LBL self-assembly cycles are 10 times. The properties of the CS-CNCs multilayer modified films obtained in this example were tested, and it was found that they also had good wetting properties and anti-oil contamination properties.

[0065] To sum up, due to the chemical structure of the CS-CNCs multilayer modified film of the present invention, the rigid CNCs have a large number of hydrophilic groups tightly bound on the surface, so the CS-CNCs multilayer modified film can be in the air. or oil to maintain its strong surface hydration ability, and will not be contaminated by crude oil even in a dry state; in addition, CS-CNCs multilayer modified film also has super-amphiphilicity in air, super-oleophobicity in underwater and oil-in-oil Super-hydrophilic properties and show high separation effici...

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Abstract

The invention discloses a CS-CNCs multi-layer modified film contaminated with anti-oil and a preparation method and application thereof. The preparation method comprises the following steps: cleaning and drying a stainless steel mesh to obtain a clean stainless steel mesh; The stainless steel mesh is subjected to surface hydroxylation treatment to obtain a stainless steel mesh after surface hydroxylation; the chitosan solution and the cellulose nanocrystal solution are prepared respectively; the chitosan and cellulose nanocrystals are assembled in turn by a layer-by-layer self-assembly cycle method. On the stainless steel mesh after the surface hydroxylation, the CS-CNCs multilayer modified film contaminated with antigenic oil was obtained. The CS-CNCs multi-layer modified membrane of the present invention can still resist the pollution of crude oil without pre-wetting, and has super-amphiphilicity in air, super-oleophobic underwater and super-hydrophilic performance under oil, and can treat crude oil. The high-efficiency separation of oil / water mixtures and various oil-in-water emulsions has great potential in the purification of complex oily wastewater.

Description

technical field [0001] The invention relates to the technical field of membrane materials, in particular to a CS-CNCs multi-layer modified membrane contaminated with antigenic oil and a preparation method and application thereof. Background technique [0002] Filtration membranes have been widely used for the purification of oily wastewater, but are often threatened by oil contamination. To address this problem, filter membranes with superamphiphilicity in air and superoleophobicity in water have been developed for oil / water separation. However, most membranes must be pre-wetted to avoid oil fouling of the membrane. Once these membranes come into contact with oil before they are pre-wetted with water, fouling occurs and is difficult to recover, requiring additional energy consumption. [0003] In addition, in recent years, inorganic films have received more attention due to their physicochemical stability, thermal stability, and good durability. Compared with other porous...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/10B01D71/08B01D71/10C02F1/44C02F101/32
CPCB01D71/10B01D71/08B01D69/105B01D67/0002B01D69/02C02F1/44B01D2325/36C02F2101/32
Inventor 何毅王宇琪李虹杰余晶张李云
Owner SOUTHWEST PETROLEUM UNIV