Mitigating the hydraulic compression of nanofiltration hollow fiber membranes through a single-step direct spinning technique

Yee Kang Ong, Tai-Shung Chung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Most nanofiltration (NF) membranes have been made through complicated multistep or thin-film composite processes. They also suffer the compaction issue that reduces permeate flux in pressure-driven filtration processes. A single-step coextrusion hollow fiber fabrication technique via immiscibility induced phase separation (I2PS) process is presented in this study to fabricate NF hollow fiber membranes. A protective layer is concurrently formed on top of the selective layer during the phase inversion process. The fabricated hollow fiber membrane has a narrow pore size distribution with a molecular weight cutoff (MWCO) of 470 Da. The outer layer of the I2PS hollow fiber is found to serve as a buffering layer that mitigates hydraulic compression on the compaction of dense-selective layer and sublayer and helps to retain membrane performance during nanofiltration operations. The newly fabricated NF hollow fiber membrane exhibits an average pure water permeability of 3.2 L m-2 h-1 bar-1 and shows good rejections toward the testing dyes. This study may offer a simple, direct, and cost-effective approach to fabricate NF hollow fiber membranes.

Original languageEnglish (US)
Pages (from-to)13933-13940
Number of pages8
JournalEnvironmental Science and Technology
Volume48
Issue number23
DOIs
StatePublished - Dec 2 2014

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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