Preparation method of polyamide nanofiltration composite membrane and the polyamide nanofiltration composite membrane thereby

摘要

The present invention provides a method for preparing a polyamide nanocomposite membrane comprising: a step for dipping a porous support in a multifunctional aqueous solution containing amine (step 1); and a step for conducting interfacial polymerization by dipping the porous support, which has been dipped at the step 1, in an organic solution containing multifunctional acyl halide and distilled water (step 2). The method for preparing a polyamide nanocomposite membrane according to the present invention has advantages of high salt rejection required in the field of nanofiltration membranes or reverse osmosis membranes and high permeability. Hence, the polyamide nanocomposite membrane according to the present invention embodies high permeability at a nanofiltration level so that the capacity per unit time increases and the efficiency in a water treatment process is improved, thereby being economically advantageous. Therefore, the polyamide nanocomposite membrane can be applicable to various nanofiltration processes, especially in the fields of potable water, water softening, pretreatment for seawater desalination, and food manufacturing process.