Completely green and sustainable preparation of PVDF hollow fiber membranes via melt-spinning and stretching method

Dawei Ji; Changfa Xiao; Shulin An; Kaikai Chen; Yifei Gao; Fang Zhou; Tai Zhang

doi:10.1016/j.jhazmat.2020.122823

Completely green and sustainable preparation of PVDF hollow fiber membranes via melt-spinning and stretching method

J Hazard Mater. 2020 Nov 5:398:122823. doi: 10.1016/j.jhazmat.2020.122823. Epub 2020 May 20.

Authors

Dawei Ji¹, Changfa Xiao², Shulin An³, Kaikai Chen¹, Yifei Gao³, Fang Zhou³, Tai Zhang¹

Affiliations

¹ School of Textile Science and Engineering, and State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China.
² School of Textile Science and Engineering, and State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China. Electronic address: xiaochangfa@163.com.
³ School of Material Science and Engineering, Tiangong University, Tianjin 300387, China.

PMID: 32512436
DOI: 10.1016/j.jhazmat.2020.122823

Abstract

In this work, the poly(vinylidene fluoride) (PVDF) hollow fiber membranes with switchable pore size were fabricated by melt-spinning and stretching (MS-S) process based on a completely green and sustainable route. The membrane preparation process and pore formation mechanism were discussed and investigated in detail. Meanwhile, the effect of stretching ratio on the membrane structure and property was studied based on scanning electron microscopy (SEM), pore size distribution, N₂ flux, pure water flux, mechanical property and so on. The prepared membranes with different stretching ratios exhibited excellent tensile strength in the range from 23.0 to 62.6 MPa. The mean pore size of the prepared membranes with stretching 100 % (M-100) was about 0.317 μm, which showed a high dye rejection (<93.9 %) for Direct Black 19. Specifically, there were not any organic solvent and low-molecular-weight diluent used during the preparation process. The recycled PEO and water were obtained after treating the wastewater by membrane filtration. In addition, the recycled PEO could be reused as pore forming agent, which could achieve completely green and sustainable membrane preparation process.

Keywords: Environmental-friendly; Fiber bundle structure; MS–S; Switchable pore size.

Publication types

Research Support, Non-U.S. Gov't