4.7 Article

Novel macrocyclic polyamines regulated nanofiltration membranes: Towards efficient micropollutants removal and molecular separation

Journal

JOURNAL OF MEMBRANE SCIENCE
Volume 668, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.memsci.2022.121180

Keywords

Interfacial polymerization; Cyclen; Loose nanofiltration membrane; Organic micropollutants; salts separation; Antifouling

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A loose nanofiltration (LNF) membrane was developed by interfacial polymerization using 1, 4, 7, 10-tetraazacyclododecane (Cyclen) as a new aqueous monomer. The LNF membrane showed a considerably high water permeance, with rejection rates of 99.9% and 92.7% for methyl blue and tetracycline (pH=9), while maintaining a low rejection for monovalent salts (e.g., 4.5% for NaCl). The membrane also exhibited superior anti-fouling performance with a smooth, highly negatively charged surface and low operation pressure.
The discharge of wastewater containing organic micropollutants not only causes severe environmental pollution, but also exacerbates the scarcity of freshwater resources and poses a serious threat to human health. The nanofiltration (NF) membrane has unique advantages and obvious energy-saving effects in the demineralization of organic micropollutants. Poly(piperazine) amide NF membrane exhibits the poor organic micropollutants/salt selectivity and low water permeance. Therefore, developing a novel NF membrane with high water permeance and superior selectivity is of significance. In this study, a loose nanofiltration (LNF) membrane is fabricated by interfacial polymerization with 1, 4, 7, 10-tetraazacyclododecane (Cyclen) as a new aqueous phase monomer to modulate the polyamide microstructure. The steric structure of Cyclen is larger than that of PIP, and the steric hindrance increases, resulting in a low stacking density of the formed polyamide polymer. Compared with the PIP-based NF membrane, the fabricated Cyclen-TMC LNF membrane has a smoother surface, a higher density of carboxyl groups, and a lower degree of cross-linking. The Cyclen-TMC membrane exhibits the considerable water permeance, with the corresponding rejection of 99.9% and 92.7% for methyl blue and tetracycline (pH = 9), respectively, while maintaining a low rejection for monovalent salts (e.g., 4.5% for NaCl). Furthermore, the LNF membrane shows a superior anti-fouling performance with the relatively smooth, highly negatively charged surface and low operation pressure. The novel LNF membrane exhibits a high potential for textile and phar-maceutical wastewater treatment. This study provides a new candidate to regulate the separation performance of NF membranes using new aqueous monomers.

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