High-hydrophilicity nanofiber coating-based nanofiltration membrane and preparation method thereof

A nanofiber and hydrophilic technology, which is applied in the field of nanofiltration membranes, can solve the problem that composite nanofiltration membranes are difficult to achieve the effect of large flux and high rejection rate at the same time, and it is difficult to overcome the trade-off between separation flux and separation selectivity. , nanofiltration membrane separation flux increase limited and other issues, to achieve the effect of synergistic increase in flux and rejection rate, excellent hydrophilicity, and small thickness

Active Publication Date: 2020-09-11
WUHAN TEXTILE UNIV
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Problems solved by technology

[0008] However, the above-mentioned preparation methods are relatively limited in improving the separation flux of nanofiltration membranes, and it is difficult to overcome the trade-off effect between separation flux and separation selectivity.
In the prior art, there are still the following defects: the large flux and high rejection rate of the composite nanofiltration membrane are difficult to achieve the use effect at the same time, which affects the filtration efficiency; or a large amount of organic solvents will be used, resulting in environmental pollution; or mass production is limited, it is difficult to Wide application limits the further development of nanofiltration membranes

Method used

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  • High-hydrophilicity nanofiber coating-based nanofiltration membrane and preparation method thereof

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preparation example Construction

[0035] The invention provides a method for preparing a highly hydrophilic nanofiber coating-based nanofiltration membrane: comprising the following steps:

[0036] S1, dispersing ethylene-vinyl alcohol copolymer nanofibers with a diameter of 0.05-0.5 μm in a solvent, stirring evenly to prepare a dispersion liquid with a solid content of 0.2-6.0 wt% of the ethylene-vinyl alcohol copolymer nanofibers, sealing save;

[0037] S2, using the spraying method to apply the dispersion liquid prepared in step S1 on one surface of the micron fiber non-woven fabric base layer, the coating thickness is 2-10 μm, and the coating density is 5-10 g / m 2 , dried to prepare the nanofiber coating base film;

[0038] S3, soak the nanofiber coating base film prepared in step S2 in an alkali solution of predetermined concentration for 15-60min, wash and air-dry, and then conduct plasma treatment in air or sulfur dioxide atmosphere for 1-5min, to obtain a surface containing Highly hydrophilic nanofib...

Embodiment 1

[0046] A preparation method of a highly hydrophilic nanofiber coating-based nanofiltration membrane, comprising the following steps:

[0047] S1, disperse ethylene-vinyl alcohol copolymer nanofibers with a diameter of 0.05-0.5 μm in a mixed liquid phase with a mass ratio of ethanol and deionized water of 1:1, and stir to prepare nanofibers with a solid content of 0.5 Wt% dispersion liquid, sealed and stored;

[0048] S2, the nanofiber dispersion is coated on one surface of the polyamide non-woven substrate by spraying, the coating thickness is 5 μm, and the coating density is 6 g / m 2 , dried in vacuum at room temperature to prepare a nanofiber coating base film;

[0049] S3, prepare a NaOH alkali solution with a concentration of 3mol / L, soak the nanofiber coating base film in the NaOH alkali solution for 15min, then wash it with water and ethanol for several times, and perform plasma treatment in the air atmosphere after air-drying 5min, sealed and stored to obtain a highly ...

Embodiment 2-5

[0057] The difference from Example 1 is: in the interfacial polymerization process of step S4, the concentration of water phase monomer and oil phase monomer, i.e. piperazine (PIP), triethylamine (TEA) and trimesoyl chloride (TMC) The settings are different, and the specific settings are as shown in Table 1, and the others are the same as in Embodiment 1, and will not be repeated here.

[0058] Table 1 is embodiment 1-5 and process parameter setting and performance parameter

[0059]

[0060] The interfacial polymerization process is controlled by diffusion. The structure and chemical properties of different monomers lead to differences in solubility and diffusion rates in the two phases, and finally form selective separation layers with different crosslinking degrees, pore sizes, and hydrophilic and hydrophobic properties. The selection of suitable interfacial polymerization monomers plays a decisive role in the construction of high permeation selectivity composite nanofil...

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Abstract

The invention provides a high-hydrophilicity nanofiber coating-based nanofiltration membrane and a preparation method thereof. The high-hydrophilicity nanofiber coating-based nanofiltration membrane is formed by compounding a high-hydrophilicity nanofiber coating base membrane and a nanofiltration separation layer loaded on the surface of the high-hydrophilicity nanofiber coating base membrane. The preparation method comprises the following steps: firstly, carrying out wet coating on an ethylene-vinyl alcohol copolymer nanofiber dispersion liquid on a non-woven fabric base layer to prepare a nanofiber coating base film; then carrying out alkali treatment and plasma treatment, and carrying out functional modification on the base membrane to obtain the high-hydrophilicity coating base membrane; and finally, carrying out interfacial polymerization to obtain the high-hydrophilicity nanofiber coating-based nanofiltration membrane. The composite nanofiltration membrane prepared by the invention is compact in structure, has high hydrophilicity, can realize synergistic improvement of flux and retention rate, and also has an excellent filtering effect. The preparation method provided by theinvention can optimize the interfacial polymerization process, and the preparation process is simple and controllable, green and pollution-free, and low in cost, and has a great industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membranes, in particular to a preparation method of a highly hydrophilic nanofiber coating-based nanofiltration membrane. Background technique [0002] Nanofiltration is a pressure-driven membrane separation process between ultrafiltration and reverse osmosis. The pore size of nanofiltration membrane is above 1nm, generally 1-2nm. According to the pore size of the nanofiltration membrane and the state of charge on the surface, the nanofiltration membrane can selectively intercept divalent or multivalent salt ions in water, and the interception of monovalent salt ions is relatively low. The nanofiltration membrane can also screen out substances with a molecular weight of 200 to 1000, and further remove impurities such as small molecular proteins and polypeptides on the basis of ultrafiltration. Compared with reverse osmosis membrane, nanofiltration membrane has low operating pressure and la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D69/02B01D67/00B01D61/00
CPCB01D71/44B01D71/56B01D69/02B01D69/125B01D67/0006B01D61/027B01D2325/40
Inventor 刘轲王栋马思琪刘念程盼郭启浩王旭程芹夏明徐佳
Owner WUHAN TEXTILE UNIV
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