A novel positively charged nanofiltration membrane formed via simultaneous cross-linking/quaternization of poly(m-phenylene isophthalamide)/polyethyleneimine blend membrane
| Autor: | Bao-Ku Zhu, Zhikan Yao, Du Shiyuan, Chun-Er Lin, Li-Feng Fang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Chemistry Salt (chemistry) Filtration and Separation 02 engineering and technology 021001 nanoscience & nanotechnology Analytical Chemistry Divalent Membrane 020401 chemical engineering Chemical engineering Phenylene Permeability (electromagnetism) Surface charge Nanofiltration 0204 chemical engineering 0210 nano-technology Selectivity |
| Zdroj: | Separation and Purification Technology. 212:101-109 |
| ISSN: | 1383-5866 |
| DOI: | 10.1016/j.seppur.2018.11.026 |
| Popis: | A novel positively charged nanofiltration membrane was designed and prepared by a simultaneous cross-linking/quaternization of poly(m-phenylene isophthalamide)/polyethyleneimine (PMIA/PEI) blend precursor membrane. To improve the PEI retention ratio during precursor membrane fabrication, propanetriol glycidyl ether (PTGE) was used as a cross-linker. For nanofiltration preparation, the cross-linking time and p-xylylene dichloride (XDC) concentration were optimized. A comprehensive characterization of the nanofiltration membrane was conducted in terms of chemical composition, surface morphology, surface charge, pore structures and separation properties. Results indicated that the density of the positive charge increased after the simultaneous cross-linking/quaternization. The nanofiltration membrane with pore size in the range of 0.5–2 nm exhibited high MgCl2 rejection of 94.4% and water permeability of 37.3 L m−2 h−1 at 0.4 MPa. Furthermore, to make a comparison between the PMIA/PEI nanofiltration membrane and the other PEI based nanofiltration membranes in the previous studies, an empirical upper bound correlation between water permeability and water/salt selectivity was established. Due to the high density of positive charge on the membrane, the mono-/divalent ion (Na+/Mg2+) selectivity of this novel nanofiltration membrane was at a high level compared with recent reports and much higher than commercial nanofiltration membranes. This work provides an effective method for fabricating the highly positively charged nanofiltration membrane which has great potential for multivalent cations separation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect