Abstract
A series of nanofiltration membranes with high flux at low operating pressure were prepared by dynamic self-assembly of poly (styrenesulfonic acid sodium salt) (PSS), poly (4-styrenesulfonic acid-co-maleic acid) sodium salt (PSS-co-MA) and poly (allylamine hydrochloride) (PAH) on the modified polyacrylonitrile (PAN) membrane. Fourier transform infrared spectroscopy (FTIR-ATR) testified that the polyelectrolyte could successfully deposit on the surface of the modified polyacrylonitrile ultrafiltration membrane. The effects of substrates, assemble bilayer number and the capping PAH solution concentration, operating pressure and CuCl2 concentration on CuCl2 removal were investigated. The [PAH/PSS] 1 PAH/PSS-co-MA/PAHc NF membrane composed of only 2.5 bi-layers displayed 88.9% CuCl2 rejection and the permeate flux was 25.1 L/ m2.h when the operating pressure was 0.2 MPa. The CuCl2 rejection was still above 86.3% when the operation pressure increased to 0.8 MPa, meanwhile, the permeate flux increased greatly to 85.8 L/ m2.h.
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