RT info:eu-repo/semantics/article
T1 Pore size analysis from retention of neutral solutes through nanofiltration membranes. The contribution of concentration–polarization
A1 Martín García, Noemí Carmen
A1 Silva, Verónica
A1 Carmona del Río, Francisco Javier
A1 Palacio Martínez, Laura
A1 Hernández Giménez, Antonio
A1 Prádanos del Pico, Pedro Lourdes
K1 Nanofiltration
K1 Mass transfer
K1 Retention
K1 Pore size distribution
AB Pore size distribution is one of the most important characteristics of a membrane. This can be obtained from thefitting of pore radius calculated fromretention versus flux measurements for a set of solute solutions. In thisworka set of non-charged similar molecules is chosen as solutes to minimize other interactions apart of those relatedto size. The hydrodynamic model will be used to characterize the behavior of the membrane to unchargedsolutes, assuming that membrane pores are straight and cylindrical.As is known, the phenomenon of concentration polarization must be taken into account because true retention isnot experimentally accessible by concentration measurements. Frequently, the film layer model is applied for thedependence of concentration with experimental conditions; but the application of this model requires priorknowledge of the mass transfer coefficientwhich is evaluated by different dimensionless correlations (Sherwoodcorrelation). Here we show a review of different alternatives in doing it and analyze their consequences whencomputing the pore size distribution.Experimental data were obtained from dead-end filtration experiments of a set of four ethylene glycol solutionswith a nanofiltration membrane. Obtained results show the importance of the mass transfer model in the poresize value obtained.
PB Elsevier
SN 0011-9164
YR 2014
FD 2014
LK http://uvadoc.uva.es/handle/10324/21899
UL http://uvadoc.uva.es/handle/10324/21899
LA eng
NO Desalination 2014, vol. 344, p. 1–11
NO Producción Científica
DS UVaDOC
RD 23-nov-2024