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Crude oil pollution resistant CS-CNCs multilayer modified membrane as well as preparation method and application thereof

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: 2021-09-17
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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  • Crude oil pollution resistant CS-CNCs multilayer modified membrane as well as preparation method and application thereof
  • Crude oil pollution resistant CS-CNCs multilayer modified membrane as well as preparation method and application thereof
  • Crude oil pollution resistant CS-CNCs multilayer modified membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A CS-CNCs multilayer modified membrane contaminated with antigenic oil is prepared by the following steps:

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

[0047] (2) Configure the 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 clean water until neutral , and dried at 60°C to obtain a surface hydroxylated stainless steel mesh.

[0048] (3) Add CS powder to 1wt.% glacial acetic acid solution to obtain 0.2wt.% CS solution, and prepare a uniform solution by magnetic stirring for 6 hours; obtain 0.2wt.% CS by adding CNCs powder to ...

Embodiment 2

[0064] The difference from Example 1 is that the meshes of the four stainless steel meshes prepared in this example are 500 mesh, 800 mesh, 1000 mesh, and 2500 mesh respectively, and the number of LBL self-assembly cycles is 10 times. Performance tests were performed on the CS-CNCs multilayer modified membranes obtained in this example, and it was found that they also had good wettability and antigenic oil contamination performance.

[0065] In summary, due to the chemical structure of the CS-CNCs multilayer modified membrane of the present invention, rigid CNCs have a large number of hydrophilic groups tightly bound on the surface, so the CS-CNCs multilayer modified membrane can be used in the air Or oil maintains its strong surface hydration ability, even in dry state, it will not be polluted by crude oil; in addition, CS-CNCs multilayer modified film also has super amphiphilic in air, super oleophobic underwater and under oil Super-hydrophilic performance, and shows high se...

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Abstract

The invention discloses a crude oil pollution resistant CS-CNCs multilayer modified membrane 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; performing surface hydroxylation treatment on the clean stainless steel mesh to obtain a stainless steel mesh subjected to surface hydroxylation; preparing a chitosan solution and a cellulose nanocrystal solution respectively; and sequentially and alternately assembling chitosan and cellulose nanocrystals on the stainless steel mesh subjected to surface hydroxylation by adopting a layer-by-layer self-assembly circulating method to obtain the crude oil pollution resistant CS-CNCs multilayer modified membrane. The CS-CNCs multilayer modified membrane disclosed by the invention can still resist the pollution of crude oil under the condition of no pre-wetting, and has super-amphipathicity in air, super-oleophobicity underwater and super-hydrophilicity under oil. The product can efficiently separate a crude oil / water mixture and various oil-in-water emulsions, and has huge potential in the aspect of complex oil-containing sewage purification.

Description

technical field [0001] The invention relates to the technical field of membrane materials, in particular to a CS-CNCs multilayer modified membrane contaminated with antigenic oil and its preparation method and application. Background technique [0002] Membranes have been widely used for the purification of oily wastewater, but are often threatened by oil contamination. To address this issue, filter membranes with superamphiphilicity in air and superoleophobicity underwater have been developed for oil / water separation. 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. [0003] In addition, in recent years, inorganic membranes have received more attention due to their physicochemical stability, thermal stability, and good durability. Among them, compared with other porous subst...

Claims

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Application Information

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Patent Type & Authority Applications(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