Highly hydrophilic 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 synergistic increase of flux and rejection rate, increase the water permeation area, the effect of small thickness
CN111644080BActive Publication Date: 2022-03-22WUHAN TEXTILE UNIV
8 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WUHAN TEXTILE UNIV
Publication Date
2022-03-22

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides a highly hydrophilic nanofiber coating-based nanofiltration membrane and a preparation method thereof. The highly hydrophilic nanofiber coating-based nanofiltration membrane is composed of a highly hydrophilic nanofiber coating base membrane and a nanofiltration separation layer loaded on the surface of the highly hydrophilic nanofiber coating base membrane. The preparation method is as follows: first wet-coat the ethylene-vinyl alcohol copolymer nanofiber dispersion on the base layer of the non-woven fabric to form a nanofiber coating base film; then undergo alkali treatment and plasma treatment to perform the function of the base film Modification to obtain a highly hydrophilic coating base membrane; finally, a highly hydrophilic nanofiber coating base nanofiltration membrane is obtained through interfacial polymerization. The composite nanofiltration membrane prepared by the invention has a dense structure and high hydrophilicity, can realize synergistic improvement of flux and rejection rate, and has excellent filtration effect. The preparation method of the invention can optimize the interfacial polymerization process, and the preparation process is simple and controllable, green and pollution-free, low in cost, and has great industrial application prospects.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More