Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7008458 | Desalination | 2014 | 7 Pages |
Abstract
The molecular weight cut-off (MWCO) is an important parameter used in the selection of membranes for specific filtration tasks. The MWCO is also used as a parameter in various membrane models. In this study the MWCO of an NTR 7450 nanofiltration membrane was investigated by filtration experiment and calculation of the rejection of neutral molecules as a function of solute molecular weight. The results were compared to a reflection coefficient model and it was shown that increasing the solute concentration decreased the MWCO value, indicating that MWCO was not a constant parameter but was dependent on concentration. The dipole moment of a solute molecule was also found to have an effect on the membrane's MWCO. The results showed that molecules with a large dipole moment caused rejection to increase with an increase in solute concentration.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Jason Shirley, Stephen Mandale, Victor Kochkodan,