High-permeability antibacterial modified polyamide reverse osmosis membrane for efficiently removing boron and preparation method of high-permeability antibacterial modified polyamide reverse osmosis membrane

Abstract

The invention relates to a high-permeability antibacterial modified polyamide reverse osmosis membrane for efficiently removing boron and a preparation method of the high-permeability antibacterial modified polyamide reverse osmosis membrane. A polymerization modification layer is arranged on the surface of a reverse osmosis membrane, and the polymerization modification layer is obtained by the graft modification of a reverse osmosis polyamide layer with 3-amino-1, 2-propylene glycol (APD) and tobramycin (TOB). The surface of the composite membrane is subjected to chemical grafting modification, APD / TOB is successfully grafted to the surface of the reverse osmosis membrane, and the novel reverse osmosis membrane is obtained. Compared with that of a reverse osmosis membrane without graft modification, the hydrophilicity of the surface of the reverse osmosis membrane is greatly improved due to the fact that the APD and TOB contain a large amount of carboxyl, so that dirt is not prone tobeing deposited on the surface of the reverse osmosis membrane, therefore, the anti-fouling capacity of the obtained reverse osmosis membrane is enhanced, meanwhile, an original peak-valley structureon the surface of the reverse osmosis membrane is covered, and the surface roughness of the modified membrane is reduced; the smoother the membrane surface is, the fewer binding sites provided for pollutant deposition are, and the stronger the anti-pollution capacity of the composite membrane is.

Description

technical field [0001] The invention relates to a highly permeable and bacteriostatic modified polyamide reverse osmosis membrane for efficient boron removal and a preparation method thereof, belonging to the field of reverse osmosis production. Background technique [0002] Boron is one of the essential trace elements for humans, animals and plants, but excessive intake of boron will cause harm to living organisms. For example, drinking water with excessive boron content will cause reproductive and developmental problems. Plants use water with excessive boron content Irrigation will cause the leaves to wither and yellow, the fruit to rot, and in severe cases, it will lead to failure of the harvest. Therefore, my country's "Drinking Water Sanitation Standard" (GB 5749-2006) stipulates that the limit of boron in drinking water is 0.5mg / L. [0003] Reverse osmosis membranes are widely used in brackish water, seawater desalination, industrial water production and drinking wate...

AI Technical Summary

Problems solved by technology

However, the existing grafting modification methods are expensive, and most of them need to introduce activating groups. The grafting process is complicated and cumbersome, and the grafting process is not easy to control, which makes the density of the obtained membrane surface modifier low and difficult to characterize.

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