Experimental analysis of negative salt rejection in nanofiltration membranes |
| |
| Affiliation: | 1. State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 211816, China;2. Jiangsu National Synergetic Innovation Center for Advanced Materials, China;3. College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China;1. RWTH Aachen University, Chemical Process Engineering, Forckenbeckstrasse 51, 52074, Aachen, Germany;2. DWI - Leibniz Institute for Interactive Materials, Forckenbeckstrasse 50, 52074, Aachen, Germany;3. Kuban State University, Department of Physical Chemistry, Stavropolskaya Str. 149, 350040, Krasnodar, Russian Federation |
| |
| Abstract: | ![]()
The rejections of mixtures of polyelectrolyte (sodium polyacrylate) and a monovalent salt (NaCl) were measured as a function of flux for two nanofiltration (NF) membranes. These rejections were corrected for concentration polarization of both salt and polyelectrolyte. The feed concentration ratio of polyelectrolyte to salt ranged from 2 to 20. The extent of reduction in monovalent salt rejection in the presence of polyelectrolyte could be predicted based on the Donnan effect after evaluating the unbound fraction of polyelectrolyte counterion, φP, in independent dialysis experiments. In the dialysis experiments it was found that β was 0.32. From this the value of the Donnan partition coefficient, β was evaluated allowing for the effect of concentration polarization of both polyelectrolyte and salt. The concentration polarization of polyelectrolyte resulted in β changing as a function of flux. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
