High-strength pollution-resistant composite reverse osmosis membrane and preparation method thereof

Abstract

The invention relates to a preparation method and application of a high-strength pollution-resistant composite reverse osmosis membrane, and the method comprises the following steps: synthesizing aminated carbon nanowires, fixing the nanowires in the reverse osmosis membrane, and by utilizing the high strength of the aminated carbon nanowires and the reactivity of amino groups, forming a double cross-linked layer of m-phenylenediamine (MPD) trimesoyl chloride (TMC) and aminated carbon nanowire trimesoyl chloride (TMC), so the stability and the mechanical strength of a desalting layer are greatly improved, and meanwhile, the flux and the desalting performance of reverse osmosis are also improved due to excellent dispersing performance, rich hydrophilic amino groups and relatively large specific surface area of aminated carbon nanowires. The test result also shows that compared with the existing reverse osmosis membrane, the reverse osmosis membrane prepared by the invention has higher mechanical strength, flux and desalination performance.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis membranes, in particular to a preparation method and application of a high-strength, pollution-resistant composite reverse osmosis membrane. Background technique [0002] With the progress of society, people pay more and more attention to water resources. Reverse osmosis membrane is one of the most widely used separation membrane products with the best application effect in the field of separation membrane. [0003] The interfacial polymerization method is currently the most important method for preparing reverse osmosis composite membranes. The polysulfone support layer is used as the base membrane, and a dense polyamide desalination layer is formed on the polysulfone support layer through the mutual reaction between two active monomers, polyacyl chloride and polyamide. Although reverse osmosis membranes are widely used, the structure of the current reverse osmosis membrane results in lo...

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Problems solved by technology

[0005] CN109876674A applied for a method of adding acidified carbon nanotubes to the aqueous phase solution, and coating the surface of the reverse osmosis membrane with dopamine and silver to modify the performance of the reverse osmosis membrane, although adding carbon nanotubes improves the strength and flux of the membrane , but there is no interaction between the acidified carbon nanotubes and the subsequent coating of dopamine and silver. With subsequent use, the coating layer will fall off and the dispersion of carbon nanotubes will deteriorate, which will lead to poor film performance.

[0006] CN106268379B applied for a modified acyl chloride graphene oxide coated on the surface of the reverse osmosis membrane, which improved the flux and antibacterial performance of the reverse osmosis membrane, but the falling off of the graphene layer is also one of the follow-up problems. When the graphene layer Gradually falling off, the flux and antibacterial performance of the reverse osmosis membrane deteriorate

The application of carbon nanowires in the field of reverse osmosis membrane manufacturing has not been found so far

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