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Polydopamine modified nanofiber coating-based nanofiltration membrane and preparation method thereof

A nanofiber and polydopamine technology, which is applied in the field of membrane separation, can solve the problems of high requirements in the preparation process of graphene oxide quantum dots, insignificant improvement of pure water flux, complicated preparation process of composite nanofiltration membrane, etc. High fiber surface roughness, synergistic improvement of water flux and retention rate, and the effect of improving water flux

Pending Publication Date: 2020-09-11
WUHAN TEXTILE UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, this method has no obvious effect on improving the pure water flux while ensuring the rejection rate, and the preparation process of graphene oxide quantum dots has high requirements and is not easy to operate. The overall preparation process of the composite nanofiltration membrane is too complicated and difficult to scale up. Range application
[0006] In addition, the above-mentioned patents all use polyethersulfone ultrafiltration membrane, polystyrene ultrafiltration membrane or polyacrylonitrile ultrafiltration membrane as the base membrane, and directly modify it with polydopamine, although this method can use polydopamine to improve the base membrane. The hydrophilicity of the membrane improves its pure water flux, but because the flux of this type of basement membrane itself is low, even if it is modified with polydopamine, its effect on improving the overall pure water flux is still not obvious, and it is difficult to maintain a high cut-off rate while still having a large throughput effect

Method used

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  • Polydopamine modified nanofiber coating-based nanofiltration membrane and preparation method thereof
  • Polydopamine modified nanofiber coating-based nanofiltration membrane and preparation method thereof
  • Polydopamine modified nanofiber coating-based nanofiltration membrane and preparation method thereof

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preparation example Construction

[0039] The present invention also provides a method for preparing the above-mentioned polydopamine-modified nanofiber coating-based nanofiltration membrane, comprising the steps of:

[0040] S1. Uniformly dispersing ethylene vinyl alcohol copolymer nanofibers with a diameter of 50-500 nm in a solvent to obtain a nanofiber dispersion with a solid content of nanofibers of 0.2-6 wt %;

[0041] S2. Apply the nanofiber dispersion obtained in step S1 on the surface of the nonwoven substrate by using wet nonwoven technology, and control the coating thickness to 2-10 μm, and the coating density to be 5-10 g / m 2 ; After the coating is completed, it is often dried in vacuum at high temperature to obtain a nanofiber coating film;

[0042] S3. Prepare a Tris buffer solution, and add lye to adjust the pH of the buffer solution to 8-9 to obtain a weakly alkaline buffer solution; dissolve a predetermined amount of dopamine hydrochloride in the weakly alkaline buffer solution In, obtain th...

Embodiment 1

[0050] The present embodiment provides a kind of preparation method of polydopamine modified nanofiber coating-based nanofiltration membrane, comprising the following steps:

[0051] S1. Disperse ethylene vinyl alcohol copolymer nanofibers with a diameter ranging from 50 to 500 nm in a mixed solvent with a mass ratio of ethanol and deionized water of 1:1, and stir thoroughly to obtain nanofibers with a solid content of 0.5 wt%. Nanofiber dispersion liquid, sealed for future use.

[0052] S2. Apply the nanofiber dispersion obtained in step S1 on one surface of the polypropylene spunbonded nonwoven fabric substrate by spraying, the coating thickness is 5 μm, and the coating density is 5 g / m 2 ; After the coating is completed, vacuum drying is carried out at room temperature to obtain a nanofiber coating film.

[0053] S3, preparation concentration is the Tris-HCl (Tris-HCl) buffer solution of 0.1mol / L, and adopts sodium hydroxide to adjust the pH of buffer solution to 8.5, obta...

Embodiment 2～13

[0060] Embodiment 2~13 provides a kind of preparation method of polydopamine modified nanofiber coating base nanofiltration membrane, compared with embodiment 1, the difference is that some parameter values ​​of the preparation process are adjusted, and the remaining steps are all the same as the implementation Example 1 is the same and will not be repeated here. The specific parameter values ​​corresponding to each embodiment are shown in Table 1.

[0061] The relevant preparation parameter of table 1 embodiment 2~13

[0062]

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Abstract

The invention discloses a polydopamine modified nanofiber coating- based nanofiltration membrane and a preparation method thereof. According to the preparation method, nanofiber dispersion liquid is used for carrying out wet coating on a non-woven base material, and a nanofiber coating film is prepared; the nanofiber coating film is soaked in a dopamine hydrochloride solution, and a polydopamine modified nanofiber coating film is obtained through auto-polymerization of dopamine; and the polydopamine modified nanofiber coating membrane is sequentially immersed into a water-phase solution and anoil-phase solution, and by carrying out interfacial polymerization, the polydopamine modified nanofiber coating-based nanofiltration membrane with high water flux and high rejection rate is formed. By means of the mode, the membrane roughness can be effectively controlled, the permeation area is increased, collaborative improvement of the water flux and the rejection rate of the nanofiltration membrane is achieved, and meanwhile the high water flux and the high rejection rate are achieved; and the preparation method provided by the invention is simple and controllable, is easy to produce anddevelop, and has relatively high application value.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a polydopamine-modified nanofiber coating-based nanofiltration membrane and a preparation method thereof. Background technique [0002] With the continuous growth of the world's population, the problem of water pollution has become increasingly serious, and the total amount of fresh water in the world has begun to decline. The shortage of water resources has become a global concern. In order to alleviate the global water crisis, researchers are gradually turning their attention to seawater desalination and water treatment technologies. Among various water treatment technologies, nanofiltration is a new pressure-driven separation process between reverse osmosis and ultrafiltration. It has the characteristics of low operating pressure, low cost, and strong selectivity. , biology and many other fields have been widely used. [0003] However, most of the commonly used n...

Claims

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Application Information

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IPC IPC(8): B01D71/44B01D71/56B01D71/60B01D69/02B01D67/00B01D61/00
CPCB01D71/44B01D71/56B01D71/60B01D69/02B01D67/0006B01D67/0093B01D61/027B01D2325/02B01D2325/36B01D2325/40
Inventor 王栋刘轲刘念程盼马思琪郭启浩万雨彩程芹夏明徐佳
Owner WUHAN TEXTILE UNIV
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