Preparation method of polyamine nanoparticle self-assembled nanofiltration membrane

Abstract

The invention discloses a preparation method of a polyamine nanoparticle self-assembled nanofiltration membrane. Polyamine monomer molecules are adopted as raw materials, polyamine is taken as a bionic adhesive, the polyamine nanoparticles are formed through auto-polymerization in an aqueous solution, and the polyamine nanocomposite nanofiltration membrane is prepared by in-situ self-assembly and interfacial cross-linking on the surface of a porous support membrane. By regulation of the surface self-assembly behavior and the interfacial crosslinking process of the polyamine nanoparticles, the thickness, the crosslinking degree and surface properties of a nano-separation layer can be optimized, and the nanofiltration membrane with high permeation selectivity and good stability can be obtained. The water flux of the nanofiltration membrane in operating pressure of 0.6MPa is 80-150 Lm<-2>.h<-1>, the organic matter molecular interception rate can be as high as 98%, and the inorganic salt ion interception rate is generally lower than 30%. Therefore, the prepared polyamine nano-composite nanofiltration membrane has high separation selectivity and water permeation flux; the preparation method of the membrane is simple, convenient, controllable and low in cost, thereby having good industrial application prospect.

Description

Preparation method of polyamine nanoparticle self-assembled nanofiltration membrane technical field The invention belongs to the field of nanofiltration membrane separation, and in particular relates to a preparation method of polyamine nanoparticle self-assembled nanofiltration membrane. Background technique As a pressure-driven membrane separation process between reverse osmosis and ultrafiltration, nanofiltration has the advantages of low operating pressure, no chemical reaction, no phase change, and high separation efficiency. It is used in seawater desalination, drinking water purification, wastewater treatment and It plays an increasingly important role in the fields of industrial material separation and resource recovery. The pore size of the nanofiltration membrane is usually 0.5~2nm and the membrane has a certain chargeability. According to the principle of pore size sieving and electrostatic repulsion, it shows unique advantages in the separation of inorganic sal...

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Problems solved by technology

With the expansion of the market demand for nanofiltration membranes, the variety of polyamide nanofiltration membranes is increasing, and researchers at home and abroad have synthesized different types of organic and aqueous functional monomer molecules: such as 5-chloroformyloxy m-benzene Formyl chloride, 5-isocyanic acid isophthaloyl chloride, N,N-aminoethylsulfonated propylpiperazine and hexafluoroalcohol modified methylene dianiline, etc. (J. Membr. Sci., 2009, 344, 155-164; J. Mater. Sci., 2010, 20, 4615-4620; J.Membr. Sci., 2013, 431, 171-179), the obtained new polyamide composite membrane has better Anti-chlorine, anti-oxidation and anti-pollution properties, but because the interfacial polymerization reaction rate is fast, difficult to control and self-inhibiting, it is difficult to make the separation performance of the polyamide composite membrane break through the trade-off effect, and obtain both high water permeability and material separation select performance

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