Ultra-strong polymeric hollow fiber membranes for saline dewatering and desalination

Can Zeng Liang, Mohammad Askari, Looh Tchuin (Simon) Choong and Tai-Shung Chung ()
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Can Zeng Liang: National University of Singapore
Mohammad Askari: National University of Singapore
Looh Tchuin (Simon) Choong: Gradiant International Holdings Pte. Ltd., 1 Cleantech Loop #03-04/05/06
Tai-Shung Chung: National Taiwan University of Science and Technology

Nature Communications, 2021, vol. 12, issue 1, 1-12

Abstract: Abstract Osmotically assisted reverse osmosis (OARO) has become an emerging membrane technology to tackle the limitations of a reverse osmosis (RO) process for water desalination. A strong membrane that can withstand a high hydraulic pressure is crucial for the OARO process. Here, we develop ultra-strong polymeric thin film composite (TFC) hollow fiber membranes with exceptionally high hydraulic burst pressures of up to 110 bar, while maintaining high pure water permeance of around 3 litre/(m2 h bar) and a NaCl rejection of about 98%. The ultra-strong TFC hollow fiber membranes are achieved mainly by tuning the concentration of the host polymer in spinning dopes and engineering the fiber dimension and morphology. The optimal TFC membranes display promising water permeance under the OR and OARO operation modes. This work may shed new light on the fabrication of ultra-strong TFC hollow fiber membranes for water treatments and desalination.

Date: 2021
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DOI: 10.1038/s41467-021-22684-1

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