期刊
JOURNAL OF MEMBRANE SCIENCE
卷 657, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2022.120675
关键词
Loose nanofiltration membrane; Bis-tris propane; Self-repression thickness; Dye/salt separation; Diffusion rate
资金
- National Natural Science Foundation of China [62174043]
- Postgraduate education reform project of Harbin institute of technology [21MS029]
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [ES202007]
- Major Science and Technology Program for Water Pollution Control and Treatment [2017ZX07502003]
This study demonstrates the fabrication of a novel polyester-amide loose nanofiltration (LNF) membrane using a long molecule bis-tris propane with amines and hydroxyl groups as the aqueous monomer in interfacial polymerization. The investigation reveals that the size of the molecule is a crucial factor for the formation mechanism of the unique loose structure of LNF. The tailored polyester-amide LNF membrane exhibits high water permeability, dye rejection, and low salt rejection, making it suitable for the fractionation of dye/salt mixtures. Furthermore, the membrane shows excellent anti-fouling and stability performance.
Loose nanofiltration (LNF) membrane with exclusively high dye rejection and inorganic salt permeation are remarkable method to treatment dye/salt wastewater for the achievement of zero liquid discharge. Herein, a long molecule bis-tris propane with amines and hydroxyl groups was firstly chosen as aqueous monomer in interfacial polymerization to fabricate a novel polyester-amide LNF membrane. Noteworthily, the investigation of morphology characterization and preparation conditions revealed that the size of molecule was a vital influence factor for the formation mechanism of unique loose structure of LNF made by long molecule. A new insight about the size of long molecule to form ultrathin thickness of self-repression layer on the formation mechanism of LNF was proposed in this work to replenish the previous theory. A series of characterization verified that the polyester-amide layer is negatively charged and hydrophilic due to the carboxyl and hydroxyl groups on the surface. Meanwhile, the tailored 0.3-LNF exhibited high water permeability (114.9 L m(-2) h(-1)), dye rejection (98.83% RB 5) and low salt rejection (11.72% NaCl) under 0.5 MPa, which displayed good performance for the fractionation of dye/salt mixtures. In addition, the polyester-amide LNF membrane possesses a superior anti-fouling and stability performance.
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