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Issue 10, 2020
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Polydopamine/hydroxyapatite nanowire-based bilayered membrane for photothermal-driven membrane distillation

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Abstract

In developing countries and resource-limited regions, where no power infrastructure or waste heat from industrial plants is available, photothermal-driven membrane distillation (PMD) has been recognized as an attractive and sustainable technology for freshwater generation. PMD enables easy water collection, inherent fouling resistance, low-pressure operation, and high-salinity water treatment. Hydroxyapatite (HA) nanowires with excellent mechanical flexibility owing to their high aspect ratio, low thermal conductivity, easy surface modification and scalable production offer great potential for highly efficient membrane distillation. Herein, we demonstrate that the environmentally benign HA nanowire-based bilayered film offers the highest photothermal efficiency (62%) and water flux (0.89 kg m−2 h−1) with 1 sun irradiation (1 kW m−2), among the existing PMD systems without auxiliary heating or multilayer heat recovery reported so far. The hierarchical porous structure formed by the remarkably flexible and intertwined HA nanowires allows low resistance to vapor transport, which is critical for high water flux. Simultaneously, the low thermal conductivity of the thermal insulator layer comprised of HA nanowires prevents conductive heat transfer across the membrane, which significantly enhances the thermal efficiency of the membrane. The completely biocompatible, scalable, and thermally engineered bilayered film demonstrated here achieves highly efficient PMD.

Graphical abstract: Polydopamine/hydroxyapatite nanowire-based bilayered membrane for photothermal-driven membrane distillation

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Supplementary files

Article information


Submitted
19 Nov 2019
Accepted
31 Jan 2020
First published
31 Jan 2020

J. Mater. Chem. A, 2020,8, 5147-5156
Article type
Paper

Polydopamine/hydroxyapatite nanowire-based bilayered membrane for photothermal-driven membrane distillation

S. Cao, X. Wu, Y. Zhu, R. Gupta, A. Tan, Z. Wang, Y. Jun and S. Singamaneni, J. Mater. Chem. A, 2020, 8, 5147
DOI: 10.1039/C9TA12703H

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