Thinning of reverse osmosis membranes by ionic liquids
| Autor: | Chunxi Li, Beibei Gong, Hong Meng, Tao Geng |
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| Rok vydání: | 2014 |
| Předmět: |
Chemistry
General Physics and Astronomy Surfaces and Interfaces General Chemistry Surface finish Condensed Matter Physics Chloride Surfaces Coatings and Films Contact angle Electronegativity chemistry.chemical_compound Membrane Chemical engineering Ionic liquid medicine Zeta potential Organic chemistry Reverse osmosis medicine.drug |
| Zdroj: | Applied Surface Science. 292:638-644 |
| ISSN: | 0169-4332 |
| Popis: | In this study, ionic liquids (ILs) were used to thin out the dense layer and, in turn, tune the surface properties and separation performance of commercial aromatic polyamide reverse osmosis membranes. It was observed that the structure of the ILs and dipping time had a strong impact on the dense layer thickness and morphology. This can be understood in terms of the dissolubility and interaction force between ILs and the organic membrane surface, such as hydrogen bonding and π – π interactions. Among the ILs synthesized, 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) showed the most promising thinning effects. It was observed that the thickness of the dense layer on the surface decreased from 127 to 67 nm after dipping treatment with [BMIM]Cl for 24 h. The water flux was enhanced by 20% at the expense of a slight decline of salt rejection. AFM, contact angle and zeta potential analyses suggest that the surface hydrophilicity and electronegativity increased, while the roughness decreased, which improved the anti-fouling properties. |
| Databáze: | OpenAIRE |
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