Low-pressure high-flux hollow fiber nanofiltration (NF) membrane, and preparation method and use thereof
AssigneeHarris Membrane Clean Technology Inc.
InventorsJiang Wei, Chulong Chen, Wei Feng
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Abstract
A low-pressure high-flux hollow fiber nanofiltration (NF) membrane, and a preparation method and use thereof are provided. The low-pressure high-flux hollow fiber NF membrane includes a base membrane and a negatively-charged separation layer formed on a surface of the base membrane, where a material of the separation layer is a crosslinking product of a negatively-charged sulfonated polymer. The low-pressure high-flux hollow fiber NF membrane of the present disclosure solves the technical problem that the hollow fiber NF membranes in the prior art are difficult to have both high performance and low energy consumption.
Claims19
A preparation method of a low-pressure high-flux hollow fiber nanofiltration (NF) membrane, comprising the following steps:
- S1:
- preparing a base membrane;
- S2:
- preparing a negatively-charged sulfonated polymer solution, and dip-coating the negatively-charged sulfonated polymer solution on an outer surface of the base membrane for 1 s to 30 min to contact the outer surface of the base membrane with the negatively-charged sulfonated polymer solution, taking a dip-coated base membrane out, and heating the dip-coated base membrane at 50° C. to 100° C. to remove a solvent through an evaporation to form a coating on the outer surface of the base membrane;
- and
- S3:
- soaking the coating formed in S2 in a polyamine solution to allow a crosslinking reaction to form a separation layer;
- wherein
- a polyamine in the polyamine solution is selected from the group consisting of ethylenediamine (EDA), hexamethylenediamine (HMDA), and p-phenylenediamine;
- the crosslinking reaction is to form a sulfamide crosslinking bond with a sulfonic acid group in a molecular chain of a sulfonated polymer as a crosslinking point.
Dependencies are inferred from the claim text.