期刊
JOURNAL OF MEMBRANE SCIENCE
卷 588, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2019.117185
关键词
Green desalination; Membrane distillation; Perfluorocarbon-free; Wetting and non-wetting materials; Biomimetics; Reentrant textures; Mass transfer; Heat transfer
资金
- KAUST Baseline Research Funding [BAS/1/1070-01-01]
Widespread stress on global water supplies compels the need for low-cost and sustainable desalination processes. In this regard, desalination through membrane distillation (MD) can harness waste-grade heat or renewable energy. So far, the membranes for MD have been exclusively derived from intrinsically water-repellant materials - mostly perfluorocarbons. However, perfluorocarbons are limiting in terms of operational conditions, and they also introduce economic and environmental concerns. The development of perfluorocarbon-free MD membranes would likely address those challenges. Here, we report on the proof-of-concept for biomimetic gas-entrapping membranes (GEMs) for MD derived from silica and poly(methyl methacrylate) (PMMA) that are water-wet materials. We drew inspiration for our GEM design from the cuticles of springtails and hairs of Halobates germanus, both of which exhibit mushroom-shaped (or reentrant) features. Accordingly, our GEMs comprise arrays of microscale cylindrical pores with reentrant inlets and outlets that can robustly entrap air on submersion in water. Our PMMA-GEMs yielded a vapor flux of J approximate to 1 L-m(-2)-h(-1) while separating a solution of similar to 0.6 M NaCl at 333 K from deionized water at 288 K under a cross-flow configuration. To our knowledge, this is the first-ever demonstration of MD membranes derived from intrinsically water-wet materials, and these findings suggest that the rational design of membranes towards greener and cheaper desalination processes is possible.
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