期刊
DESALINATION
卷 544, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.desal.2022.116131
关键词
Cyclen; Noria-PEI interlayer; SARIP; Cation perm-selectivity
资金
- National Key Research and Development Program of China [2019YFE0115600]
- Fundamental Research Funds for the Central Universities [21CX06007A]
- Natural Science Foundation of Shandong Province [ZR2020MB117]
- National Natural Science Foundation of China [21908247]
In this study, a novel polyamine called Cyclen is used as the monomer to construct a nanofiltration membrane. Through a surfactant-assembly regulated interfacial polymerization (SARIP) process, the phase transfer of Cyclen is intensified, resulting in a membrane with high permeance and perm-selectivity.
For nanofiltration membranes, the selective separation of divalent/monovalent cations with high permeance is a desirable yet challenging demand due to the trade-off phenomenon between the perm-selectivity and permeance. In this study, a novel macrocyclic polyamine 1, 4, 7, 10-tetraazacyclododecane (Cyclen) is used as the aqueous phase monomer to construct a nanofiltration (NF) membrane with high permeance without sacrificing the perm-selectivity. The large molecular size of Cyclen greatly limits its interfacial mass transfer across the water/oil interface, resulting in the formation of many defects in the separation layer. Based on the widely applied interlayer technology in literature, a surfactant-assembly regulated interfacial polymerization (SARIP) is adopted to intensify the phase transfer process of the Cyclen. The interlayer accommodates enough Cyclen monomers and the surfactant acts as the phase transfer catalyst, which jointly enhance the monomer's phase transfer rate. The resultant polyamide membrane yields a uniform sub-nanometre pore size, and the combination of reduced pore size and charge distribution within the pores achieves high rejection for divalent ions and low rejection of monovalent ions, with the rejection order of LiCl (18.9 %) < NaCl (24.8 %) < MgSO4 (96.2 %) < MgCl2 (96.3 %) < Na2SO4 (97.0 %). The corresponding water permeance for MgCl2 reaches up to 18.5 L.m(-2).h(-1).bar(-1) with the desirable Li+/Mg2+ and Na+/Mg2+ perm-selectivity of 21.9 and 20.3, respectively.
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