| 초록 |
The various designs of desalination reverse osmosis (RO) membrane have been developed to improve the performance of pressure-driven membranes. However, the most RO membranes, especially polyamide (PA) from rapid interfacial polymerization still suffer from low permeate flux and membrane fouling. In this work, we controlled the surface roughness and the film thickness via layer-by-layer (LbL) process to increase water flux while maintaining the high salt rejection. The pores on poly(acrylonitrile) (PAN) were blocked with a bilayer coating of polyelectrolytes, poly(ethyleneimine) (PEI) and poly(acrylic acid) (PAA). To fabricate the selective layer, unreacted monomers, m-phenylenediamine (MPD) and trimesoyl chloride (TMC) were removed and these monomers were sequentially deposited until desired number of bilayers was obtained. As a result, we found that these membranes exhibited the improved water flux while keeping the high salt rejection comparing to the commercial PA membranes. |
