Selectivity of anionic species in binary mixed electrolyte systems for nanofiltration membranes

Citation
Tk. Dey et al., Selectivity of anionic species in binary mixed electrolyte systems for nanofiltration membranes, DESALINATN, 127(2), 2000, pp. 165-175
Citations number
10
Categorie Soggetti
Chemical Engineering
Journal title
DESALINATION
ISSN journal
00119164 → ACNP
Volume
127
Issue
2
Year of publication
2000
Pages
165 - 175
Database
ISI
SICI code
0011-9164(20000201)127:2<165:SOASIB>2.0.ZU;2-Z
Abstract
Nanofiltration membranes have been used to study their selectivity properti es employing different feed solutions such as aqueous solutions of HCl, NaC l, CaCl2 and Na2SO4 in single and binary mixed systems. A marked change in the rejection of chloride due to the addition of a second solute, sometimes approaching negative values, has been observed. The rejection curves at hi gh and low volume fluxes obtained at various operating pressures have been generated so as to cover the shifting of positive to negative rejection. Ph enomenological equations based on the irreversible thermodynamics approach and Donnan equilibrium theory have been used to derive an expression for ch loride rejection for a binary mixed system. The applicability of the model has been tested by comparing the computed and experimental chloride rejecti on data.