Characterization and performance of reverse osmosis and nanofiltration membranes submitted to subcritical and supercritical CO 2
| Autor: | Frederico Marques Penha, Marco Di Luccio, Guilherme Zin, José Carlos Cunha Petrus, Lídia Tiggemann Prando, Maria Tereza Friedrich, Katia Rezzadori |
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| Rok vydání: | 2017 |
| Předmět: |
Chemistry
General Chemical Engineering Analytical chemistry 02 engineering and technology Permeation 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Supercritical fluid 0104 chemical sciences Membrane Chemical engineering Zeta potential Point of zero charge Nanofiltration Physical and Theoretical Chemistry Solubility 0210 nano-technology Reverse osmosis |
| Zdroj: | The Journal of Supercritical Fluids. 128:39-46 |
| ISSN: | 0896-8446 |
| DOI: | 10.1016/j.supflu.2017.05.015 |
| Popis: | Behavior of nanofiltration (NF270 and NP030) and reverse osmosis (BW30 and ORAK) polymeric membranes in systems with dense CO 2 was evaluated. The influence of transmembrane pressure on the CO 2 permeate flux at subcritical and supercritical conditions was assessed and membrane characterization (FTIR-ATR, zeta potential, Hansen’s solubility parameters) was performed. The results of CO 2 permeation suggest that selectivity of polymeric matrix depends, in great extent, on the interaction between solvent and polymer. This behavior corroborates with the presence of hysteresis phenomenon in permeability curves and solubility results. Also, zeta potential showed a decrease in the membrane point of zero charge (PZC) after pressurization/depressurization cycle, suggesting possible CO 2 sorption in the membrane polymer. Nevertheless, the oil retention for NP030 and ORAK membranes was up to 85% and no damage to the membrane structure was found. Both membranes presented potential for concentration of fatty acids under dense phase CO 2 . |
| Databáze: | OpenAIRE |
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