| 초록 |
Polymeric membrane processes have been widely used for water purification and desalination. Especially, reverse osmosis (RO) membranes are able to reject small ions such as sodium chloride in salt water. To obtain high water flux as well as high rejection, various approaches have been studied. Amongst them, ultrafast water transport through carbon nanotubes (CNT) has been mostly highlighted. CNT/polymer membranes have been also studied, but the most of them have failed to achieve high flux and high rejection. Owing to low purity and coarse dispersion of CNT, further modification processes, such as purification and other pre-treatments, would be necessary. Here we show that the polyamide (TFC) membranes including modified CNT leads to improving water flux without sacrificing salt rejection. This could be achieved by following modification processes: purification, cap-opening thermal oxidation, and hydrophilic CNT. |
