Dually charged polyamide nanofiltration membranes fabricated by microwave-assisted grafting for heavy metals removal

• Published in: Journal of membrane science Vol. 640; p. 119834
• Main Authors: Huang, Ben-Qing, Tang, Yong-Jian, Gao, An-Ran, Zeng, Zuo-Xiang, Xue, Shuang-Mei, Ji, Chen-Hao, Tang, Chuyang Y., Xu, Zhen-Liang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.12.2021
• Subjects: Dually charged; Grafting; Heavy metals; Nanofiltration; Nanofiltration; Dually charged; Grafting; Heavy metals
• ISSN: 0376-7388; 1873-3123
• DOI: 10.1016/j.memsci.2021.119834

Heavy metals pollution is an urgent problem that seriously hazards human health and ecosystems. Herein, dually charged nanofiltration (NF) membranes were prepared via a facile modification with diethylenetriamine (DETA) after interfacial polymerization. More amine groups were imported after grafting and a polyamide layer with opposite charges was constructed. The as-prepared membranes had a pure water permeability of 17.0 L m−2 h−1 bar−1 and maintained ideal rejection for both Na2SO4 (98.2%) and MgCl2 (94.1%), illustrating dually charged property. In addition, the dually charged NF membranes had high rejection to a series of heavy metals, showing good application potential in heavy metals removal. [Display omitted] •The dually charged NF membranes were fabricated by microwave-assisted grafting of diethylenetriamine after interfacial polymerization.•The as-prepared membrane showed a PWP of 17.0 L m−2 h−1 bar−1 and high rejection to both Na2SO4 (98.2%) and MgCl2 (94.1%)。•The dually charged NF membranes had high rejection to a series of heavy metals, showing good application potential in heavy metals removal.