期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 540, 期 -, 页码 382-388出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.01.033
关键词
Roughness; TFC polyamide membrane; Permeability; Selectivity; Anti-fouling
资金
- Hong Kong Scholars Program [XJ2015015]
- General Research Fund of the Research Grants Council of Hong Kong [17207514]
- Seed Fund for Strategic Interdisciplinary Research Scheme at the University of Hong Kong
- National Natural Science Foundation of China [21406060]
- Fundamental Research Funds for the Central Universities [WA1514305]
- China Postdoctoral Science Foundation [2016M601527]
Thin film composite (TFC) polyamide membranes set the golden standard for reverse osmosis technology, but tuning their permeability and selectivity remains a major challenge because of the inherent permeability-selectivity trade-off. Creating nano-sized voids within the polyamide rejection layer can tune the membrane roughness and increase its effective filtration area to improve the water permeability. Here we prepare nano-foamed polyamide rejection layers by adding sodium bicarbonate into the aqueous solution of amine monomers. We show a systematic evolution of the roughness structure of polyamide membranes, with increasingly leaf-like and belt-like features appearing under enhanced nano-foaming conditions. These nano-foamed features can result in remarkable improvements in both water permeability and salt rejection and reduce membrane fouling propensity at the same time. Our study paves a new research direction for designing future generation of desalination membranes, which holds vast potential to reduce the cost and energy consumption of desalination while achieving improved product water quality. (C) 2019 Elsevier Inc. All rights reserved.
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