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Effect of organic ion on the separation of salts by nanofiltration membranes
Affiliation:1. Membrane Research Center, Department of Chemical Engineering, Razi University, Kermanshah, Iran;2. Faculty of Chemical Engineering, Gas and Petroleum, Semnan University, Semnan, Iran;1. Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China;2. State Key Laboratory for Chemo/Biosensing and Chemometrics, College of chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR China;3. Hunan ecological and environmental affairs center, Changsha 410000, PR China;1. Department of Chemical Engineering, KU Leuven, Willem de Croylaan 46, B-3001 Heverlee, Belgium;2. College of Chemical and Material Engineering, Quzhou University, 32400 Quzhou, China;3. CSIC Environment Engineering Co. Ltd., 430064 Wuhan, China;4. Center for Membrane and Water Science, Ocean College, Zhejiang University of Technology, 310014 Hangzhou, China;5. Materials & Process Engineering (iMMC-IMAP), Université catholique de Louvain, Place Sainte Barbe 2, 1348 Louvain-la-Neuve, Belgium;6. Department of Chemical and Enviromental Technology, Rey Juan Carlos University, 28933 Móstoles, Madrid, Spain
Abstract:The aim of this study is to investigate the transport mechanism of NaCl through nanofiltration membranes in mixed solutions. A model based on the Spiegler–Kedem and Perry–Linder models has been developed. Concentration polarization effects of an organic ion and NaCl were not included in the previous studies. The effects of concentration polarization on salt removal were added to the model. Reactive Black 5 (RB5) was used as an organic ion in the rejection of NaCl by DS5 membrane in all experimental runs. Different concentrations of RB5 and NaCl have been studied and a coefficient of the gel polarization effect of dye on salt removal (α) was defined depending on molar concentration ratios of dye and NaCl. Experimental and calculated results were shown to be in good agreement.
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