Superhydrophobic multifunctional membrane and preparation method and application thereof in oil-water separation

A multi-functional, super-hydrophobic technology, applied in the direction of semi-permeable membrane separation, liquid separation, separation methods, etc., can solve the problems of limited application, no hydrophobic and lipophilic properties, and inability to selectively separate oil-water mixtures, so as to avoid uneven distribution , good reusability, beneficial to separation efficiency and cycle efficiency

Active Publication Date: 2019-01-11
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because it does not have good hydrophobic and lipophilic properties, it cannot selectively separate oil-water mixtures, so its application in sewage treatment and separation is limited.

Method used

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  • Superhydrophobic multifunctional membrane and preparation method and application thereof in oil-water separation
  • Superhydrophobic multifunctional membrane and preparation method and application thereof in oil-water separation
  • Superhydrophobic multifunctional membrane and preparation method and application thereof in oil-water separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation of the non-woven fabric modified by perfluorodecyl trichlorosilane, the specific steps are as follows:

[0038] Wash the polypropylene non-woven fabric with ethanol and acetone to remove surface impurities, then put the cleaned non-woven fabric into 10% hydrochloric acid to acidify it, and then place the non-woven fabric material horizontally on a perfluorinated In the crystallization dish of decyltrichlorosilane (POTS), POTS vapor diffuses and reacts on the bottom surface of the non-woven fabric film through the silanization reaction between POTS and the hydroxyl groups on the non-woven fabric, and reacts at room temperature for 2 hours to form a hydrophobic one side;

[0039] figure 1 It is the SEM picture of the above-mentioned perfluorodecyltrichlorosilane modified non-woven fabric, a and b are different ratios.

Embodiment 2

[0041] The preparation of superhydrophobic multifunctional membrane, the specific steps are as follows:

[0042] In Example 1, the hydrophilic side of the non-woven fabric modified with perfluorodecyltrichlorosilane was modified with methacryloxypropyltrimethoxysilane (TMSPMA): the fabric sample was immersed in the mixture of TMSPMA, acetic acid and THF (respectively 2.0 mL, 0.06 mL and 18.0 mL), the mixture was stirred and heated at 70°C for 4 hours, then the fabric was desolventized and air-dried; then the fabric was heated at 100°C for 40 hours to form a sol-gel layer, followed by To graft poly N,N-dimethylaminoethyl methacrylate (PDMAEMA), that is, to graft PDMAEMA, the TMSPMA-modified fabric was immersed in a mixture consisting of 2.64 g DMAEMA and 15.0 mL THF by bubbling the solution with nitrogen Deoxidize for 10 minutes, inject 0.066g of AIBN 5.0mLTHF into the deoxygenated solution, then heat at 65°C for 24 hours with stirring to polymerize DMAEMA, take out the non-wov...

Embodiment 3

[0044] Example 3 The wettability behavior of the modified stainless steel mesh

[0045] attached image 3 The wettability behavior of POTS and PRMAEMA modified non-woven fabrics (superhydrophobic multifunctional membrane) to water and oil, a, b are the contact angles of water in air, c, d are the wettability of oil droplets in air Behavior; Through comparison, it can be seen that the water droplets on the modified POTS side form a spherical water droplet on the surface, indicating that it has good hydrophobic properties, while the modified PDMAEMA side shows good affinity for water and oil.

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Abstract

The invention discloses a superhydrophobic multifunctional membrane and a preparation method thereof and an application of the superhydrophobic multifunctional membrane in oil-water separation. According to the invention, a nonwoven fabric material is horizontally placed in a crystallizing dish filled with perfluorodecyl trichlorosilane (POTS), the POTS vapor is diffused by a silylation reaction between POTS and a hydroxyl group on the nonwoven fabric and is reacted at the bottom of the nonwoven fabric membrane, and a hydrophobic surface is formed; a fabric sample is immersed in a mixture of asmall amount of TMSPMA, acetic acid and THF to form a double-bond surface, and the hydrophilic surface of the nonwoven fabric is modified with methacryloxypropyltrimethoxysilane (TMSPMA); and subsequently, poly[2-(N,N-dimethyl amino)ethyl methacrylate] (PDMAEMA) is grafted to prepare the material for rapid oil-water separation. The superhydrophobic multifunctional membrane can be widely used in sewage processing and emulsion separating aspects.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a rapid oil-water separation material and its preparation method and application, in particular to a superhydrophobic multifunctional membrane, its preparation method and its application in oil-water separation. Background technique [0002] Water and oil are precious resources that people rely on for survival. However, a large amount of oil is discharged into the water to form an oil-water emulsion, which not only causes pollution of water resources but also wastes precious oil resources. Non-woven fabrics are easy to obtain, cheap, stable, porous, etc., making them widely used in daily life. However, because it does not have good hydrophobic and lipophilic properties, it cannot selectively separate oil-water mixtures, so its application in sewage treatment and separation is limited. Contents of the invention [0003] The purpose of the present invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/76B01D69/12B01D69/02B01D67/00B01D17/022
CPCB01D17/02B01D67/0006B01D69/02B01D69/12B01D71/76B01D2325/38
Inventor 路建美陈冬赟
Owner SUZHOU UNIV
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