Inner-selective coordination nanofiltration hollow fiber membranes from assist-pressure modified substrate.
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| Title: | Inner-selective coordination nanofiltration hollow fiber membranes from assist-pressure modified substrate. |
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| Authors: | Wang, Qian1 (AUTHOR), Wei, Xin2 (AUTHOR), Wang, Guang-Rui1 (AUTHOR), Lu, Tian-Dan1 (AUTHOR), Shi, Qixun1,2 (AUTHOR) ias_qxshi@njtech.edu.cn, Sun, Shi-Peng1 (AUTHOR) ssp@njtech.edu.cn |
| Source: | Journal of Membrane Science. May2021, Vol. 626, pN.PAG-N.PAG. 1p. |
| Subjects: | Hollow fibers, Nanofiltration, Polyimides, Phytic acid, Water purification, Reverse osmosis process (Sewage purification), Groundwater purification |
| Abstract: | This study aims to develop an inner selective coordination nanofiltration hollow fiber (CNHF) membrane for the efficient removal of antibiotics from groundwater. In the first step, a modified substrate with the controlled modification degree is achieved by pressure-assisted alkali modification of polyimide hollow fiber substrate to provide the active points for the construction of the dense active layer. Then, the high-performance active layer is dynamically built on the modified substrate by the coordination between Fe3+ and phytic acid. Compared to static synthesis, the pure water permeability (PWP) of the membrane is improved from 4.1 to 8.5 Lm−2h−1bar−1 and Na 2 SO 4 rejection enhanced from 68.3% to 97.0% by the dynamic synthesis with a cross-flow system. The newly developed membranes exhibit high rejection to several pharmaceuticals (>99%). This work may provide insightful guidelines for improving the fabrication procedures and scaling up the inner-selective CNHF membrane modules for water purification and other applications. [Display omitted] • Inner-selective NF hollow fiber membrane was achieved by PA/Fe coordination. • The substrate modified with assist-pressure allows optimum performance. • Double the water permeability by dynamic synthesis with cross-flow. • CNHF membrane shows high removal performance to pharmaceutics (>99%). [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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