Embedded polyzwitterionic brush-modified nanofibrous membrane through subsurface-initiated polymerization for highly efficient and durable oil/water separation

Lele Li; Yangyang Xiang; Wufang Yang; Zhilu Liu; Meirong Cai; Zhengfeng Ma; Qiangbing Wei; Xiaowei Pei; Bo Yu; Feng Zhou

doi:10.1016/j.jcis.2020.04.117

Embedded polyzwitterionic brush-modified nanofibrous membrane through subsurface-initiated polymerization for highly efficient and durable oil/water separation

J Colloid Interface Sci. 2020 Sep 1:575:388-398. doi: 10.1016/j.jcis.2020.04.117. Epub 2020 Apr 30.

Authors

Lele Li¹, Yangyang Xiang¹, Wufang Yang², Zhilu Liu², Meirong Cai², Zhengfeng Ma³, Qiangbing Wei⁴, Xiaowei Pei², Bo Yu², Feng Zhou²

Affiliations

¹ Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China; State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
² State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
³ State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; School of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China. Electronic address: mazh@licp.cas.cn.
⁴ Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China. Electronic address: weiqiangbing@nwnu.edu.cn.

PMID: 32388285
DOI: 10.1016/j.jcis.2020.04.117

Abstract

Hypothesis: Developing separation membranes functionalized by polymer brushes with high separation efficiency and good cycling stability is of great importance for oil/water separation, yet is still challenged.

Experiments: In this work, the covalently embedded polyzwitterionic brush-functionalized nanofibrous membrane was developed for efficient and durable oil/water separation. The nanofibrous membrane was prepared by the electrospinning method using initiator-embedded polyacrylonitrile (PAN) resin, followed by novel subsurface-initiated atom transfer radical polymerization (SSI-ATRP) to graft embedded poly(sulfobetaine methacrylate) brushes (PSBMA). The hydration ability, underwater oil adhesion, oil/water separation performance as well as self-cleaning properties of the as prepared membrane (PAN-sg-PSBMA) were systematically studied.

Findings: The PAN-sg-PSBMA membrane exhibited extraordinary hydration ability and underwater superoleophobicity with extremely low oil adhesion, which outperformed conventional polymer brush-modified membrane (PAN-g-PSBMA). The PAN-sg-PSBMA membrane was able to separate both oil/water mixture and surfactant-stabilized emulsions with ultrahigh permeation flux and separation efficiency. Moreover, compared with PAN-g-PSBMA, PAN-sg-PSBMA membrane exhibited unprecedented recycling stability in both permeation flux and separation efficiency, which is attributed to mechanical robustness of embedded polymer brushes and outstanding antifouling ability. The current findings revealed that embedded polymer brushes from SSI-ATRP could offer a promising design of functionalized nanofibrous membrane for highly efficient and durable oil/water separation.

Keywords: Atom transfer radical polymerization; Embedded polymer brushes; Nanofibrous membrane; Oil/water separation; Subsurface initiated-polymerization.