This study deals with selective separation of mono- and divalent cations from aqueous salt solutions using polymeric films based on polyethylene (PE) and polyamide6 (PA6), and two different commercial nanofiltration (NF) membranes. The diffusion rates (D) of ions (Na+ and Ca2+), separation factors (α) and ion rejections (R) of the films and NF membranes are examined comparatively as well as their surface morphology and hydrophilicity. It is observed that the diffusion rates of Na + are in the range of – × 10 −−1 in the decreasing order of PE > NF90 > NF270 > PA6 while Ca2+ shows diffusion rates of – × 10 −−1 in the increasing order of NF270 > NF90 ≈ PA6 > PE. |
