| 초록 |
Polyamide reverse osmosis (RO) membranes with functionalized carbon nanotubes (CNTs) are prepared by interfacial polymerization. The CNTs are functionalized by the acid mixture (sulfuric acid and nitric acid of 3:1 volume ratio) by varying amounts of acid, reaction temperature, and reaction time. Functionalization conditions of CNTs were optimized for well-dispersed state of CNTs in the polyamide layer, which is confirmed from atomic force microscopy, scanning electron microscopy, and Raman spectroscopy studies. The polyamide RO membranes containing well-dispersed CNTs showed increased water flux values than polyamide membrane prepared without any CNTs, although the salt rejection values of these membranes are very close. The high membrane performance (high water flux and salt rejection) are ascribed to the hydrophobic nanochannels of CNTs and well-dispersed states in the polyamide layers formed through the interactions between CNTs and polyamide in the active layers. |
