期刊
DESALINATION
卷 535, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.desal.2022.115803
关键词
Loose nanofiltration; Ice-crystal templating; Pore-filling; Polyelectrolyte complex; Dye/salt separation
资金
- National Natural Science Foundation of China [21878004, 21975005, 22125801]
- Beijing Municipal Natural Science Foundation
- Beijing Natural Science Foundation Committee
- Beijing Education Committee [KZ201910005001]
In this study, a rapid method for fabricating loose nanofiltration membrane was proposed using dynamic self-assembly and ice-templating technique. The prepared membrane showed superior water permeability, dye rejection efficiency, and long-term stability, making it a promising candidate for wastewater treatment.
With its charged property and multifunctional merit, polyelectrolyte multilayer (PEM) membrane shows great promise in water purification. However, the time-consumption fabrication and dense microstructure of PEM membrane hamper the development of high-performance PEM membrane for wastewater treatment. In this work, we propose the dynamic self-assembly coupled ice-templating technique to fabricate loose nanofiltration membrane in a rapid speed. By vacuum-assisted filtration, poly(ethyleneimine) (PEI) and sodium alginate (SA) can be rapidly assembled into and onto porous ceramic tube, which was subsequently experienced freeze-drying to tailor the microstructure of the result PEM membrane. The microstructure variation was approved by low-field nuclear magnetic resonance. After further chemical crosslinking, the prepared loose PEM nanofiltration membrane offers a superior water permeability of 57.4 LMH/bar, dye rejection efficiency of >99%, and low rejection to salts (12.1% for NaCl), as well as long-term stability, which can thus be potentially applied for clean water harvesting from dyestuff wastewater. The method we proposed opens a new door to intensify the mass transfer of water through the membrane for high-performance membrane development.
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