Preparation method of high-power interception reinforced nano-structure composite membrane

Abstract

The invention belongs to the technical field of membranes, and relates to a preparation method of a high-power interception reinforced nano-structure composite membrane. According to the preparation method, an aqueous phase buffer system of interfacial polymerization is changed; adding of one or a combination of more of hydrosulfide radical, sulfite radical, bisulfite radical, bicarbonate radicaland carbonate radical is carried out, enough nanometer bubbles are generated in interfacial polymerization process, the nanometer polymerization structure is enhanced, the membrane surface morphologyis changed, and the nano-structure composite membrane with super high interception rate on inorganic high valence ions is obtained, and at the same time, the water flux attenuation rate of the membrane is minimized, and the pollution resistance and the hydrophilicity are significantly improved. According to the preparation method provided by the invention, through simpler and more convenient operation steps, a high-performance and low-cost preparation process is realized under the condition that raw materials and parameter variables are greatly reduced, and the application range of the composite membrane is greatly widened.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a preparation method of a nanostructure composite membrane. Background technique [0002] As a very common composite membrane preparation process, the interfacial polymerization method can not only prepare a polymer layer with good performance by virtue of its relatively simple process steps and excellent polymerization degree, but also can add or change the water phase and The monomer in the oil phase can improve one or more performance parameters of the original composite membrane. The existing preparation of nanocomposite membranes by interfacial polymerization not only requires a complex aqueous solution system, but even requires pretreatment of the aqueous phase or base membrane, and the performance of the prepared membrane still cannot avoid the gap between the rejection rate and the membrane flux. trade-off relationship. [0003] In recent years, with the conti...

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Problems solved by technology

The existing preparation of nanocomposite membranes by interfacial polymerization not only requires a complex aqueous solution system, but even requires pretreatment of the aqueous phase or base membrane, and the performance of the prepared membrane still cannot avoid the gap between the rejection rate and the membrane flux. trade-off relationship

[0003] In recent years, with the continuous development of membrane preparation technology, the discovery of nanopolymer structure has made the interfacial polymerization method have greater application potential and further enhanced the interception effect of composite membranes. However, the formation of nanostructures in the polymerization process still needs to involve a variety of The increase of monomers and preparation steps greatly increases the difficulty of continuous production; at the same time, there is no significant advantage in the selective separation of divalent ions, and the anti-pollution and hydrophilicity have not been effectively improved.

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