Nanodiamond mediated interfacial polymerization for high performance nanofiltration membrane

• Published in: Journal of membrane science Vol. 603; p. 118003
• Main Authors: Qin, Detao, Huang, Guoji, Terada, Daiki, Jiang, Handong, Ito, Masateru M., H. Gibbons, Andrew, Igarashi, Ryuji, Yamaguchi, Daisuke, Shirakawa, Masahiro, Sivaniah, Easan, Ghalei, Behnam
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-05-2020
• Subjects: Interfacial polymerization; Nanodiamond; Nanofiltration membrane; Nanoparticle aggregation control; Water treatment; Nanofiltration membrane; Interfacial polymerization; Water treatment; Nanodiamond; Nanoparticle aggregation control
• ISSN: 0376-7388; 1873-3123
• DOI: 10.1016/j.memsci.2020.118003

Introducing nanomaterial in interfacial polymerization (IP) system for nanofiltration (NF) membrane synthesis has witnessed a remarkable performance enhancement thus drawing intensive attention. However, the underlying mechanism for nanomaterial induced performance enhancement is still unclear due to the lack of study on nanoparticle dispersity and architecture at polymerization interface. Using nanodiamond (ND) as the example, this study demonstrates nanoparticle undergoes aggregation preferably at the reaction interface and the architecture of ND particles has a direct impact on membrane structure and performance. Through proactively controlling the aggregation extent while employing these ND clusters as the nano-template, the feature morphology of NF membrane is transformed from nodules to ridges at the nanoscale. Such transformation generates a significant augmentation of effective membrane area, leading to the increase of water permeance by 70%. With a low amount of nanodiamond addition (<0.1 wt%), the NF membrane can achieve a high water permeance of 150 L m−2 h−1 MPa−1 with ~98% rejection of Na2SO4. Moreover, the introduction of nanodiamond makes the nanofiltration membrane more hydrophilic, with water contact angle decreased from 50° to 35°. The comparison with contemporary nanofiller studies indicates our nanodiamond strategy yields some of the best performance enhancement.
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•Nanodiamond is for the first time introduced for nanofiltration membrane synthesis.•Nanodiamond transforms membrane structure from nodules to ridges at the nano scale.•Nanofiltration membrane achieves high water permeance and high salt rejection.•The amount required for nanodiamond addition is relatively low (<0.1 wt%).•Nanodiamond strategy generates some best performance compared with similar studies.