Self-cleaning reverse osmosis membrane

Abstract

The invention relates to a structure of a high molecular composite membrane, in particular to a self-cleaning high molecular reverse osmosis membrane. The self-cleaning reverse osmosis membrane is characterized in that a porous support membrane is compounded with a polyamide ultrathin desalting layer through interfacial polycondensation of aromatic polyamine and polyatomic acyl chloride, and the compounded desalting layer is compounded with a temperature-sensitive functional high molecular material with low critical transition temperature through solution coating technology. The self-cleaning reverse osmosis membrane has the advantage that the desalting rate and water flux of the reverse osmosis membrane are not lower than those of the prior anti-pollution reverse osmosis membrane technology, and also has the advantages of universality, simplicity, high efficiency and the like; and a preparation method thereof is comparatively simple. The reverse osmosis membrane of the invention has wide application.

Description

technical field [0001] The invention relates to a structure of a polymer composite membrane, in particular to a polymer reverse osmosis membrane capable of self-cleaning. technical background [0002] Reverse osmosis technology is a new green separation technology with high efficiency and energy saving. It has the outstanding characteristics of simple equipment, mild operating conditions, large processing capacity and high separation efficiency. Separation, environmental engineering, food, medicine and other fields have been widely used, and have achieved good economic and social benefits; in recent years, with the increasing shortage of global water resources and increasing water pollution, reverse osmosis technology has The field of water reuse has been more widely used and valued. However, one of the bottlenecks in the application of reverse osmosis membrane separation technology is membrane fouling. Membrane fouling has seriously restricted the large-scale application a...

AI Technical Summary

Problems solved by technology

[0008] (1) Surface coating can effectively reduce the roughness of the membrane surface and reduce the pollution of colloidal substances on the membrane surface, but the coating will increase the osmotic resistance of water, resulting in the loss of permeation flux of the reverse osmosis composite membrane;

[0009] (2) To improve the anti-pollution performance of the membrane by increasing the hydrophilicity of the membrane surface, it must be aimed at different pollutants. For hydrophobic solutes such as proteins and microorganisms, the pollution to the membrane surface can be reduced, but for hydrophilic solutes such as natural Organic matter (NOM) will aggravate the pollution of the membrane surface;

[0010] (3) The change of the charge on the membrane surface will help reduce the pollution of the membrane surface by the solute with the same charge as the membrane surface, but will increase the pollution of the membrane surface by the solute with the opposite charge on the membrane surface, so that the membrane surface will be neutralized. In turn, it will affect the separation performance of the membrane for charged ions;

[0011] (4) Using chemical or graft modification, not only the process is complicated, but also the structure of the membrane will be destroyed, and the mechanical strength and separation performance of the membrane will be reduced.

[0012] Therefore, when using traditional membrane surface modification technology and ideas to design and prepare anti-pollution reverse osmosis membranes, not only must the physical and chemical properties of the target pollutants and their interaction with the membrane surface be fully understood, but it is also difficult to obtain an anti-fouling membrane with self-cleaning function. Pollution Reverse Osmosis Composite Membrane

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