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A facile nanocomposite strategy to fabricate rGO-MWCNT photothermal layer for efficient water evaporation

Abstract

Solar-driven water evaporation assisted by photothermal membrane is considered as one of the sustainable and cost-effective strategies for pure water generation and waste water treatment. Herein, we report a facile but effective approach to improve the photothermal performance by compositing the 2D reduced graphene oxide (rGO) and 1D multi-walled carbon nanotubes (MWCNTs), which have different nanomorphologies. The photothermal layer can be easily deposited on different substrate materials via simple vacuum assistance. Such composite photothermal layer shows a rough surface with controllable nano-structure, which thus can optimize the solar light harvesting. On the other hand, the formation of loose internal porous structure and suitable wettability ensure the water transport inside the photothermal layer during evaporation. The surface temperature reaches as high as 78 °C just under one sun irradiation (1 kW m-2), which is 10 °C higher than the result of pure rGO membrane. Loading on PVDF substrate, the rGO-MWCNT based membrane is flexible and shows an obvious improvement on evaporation rate, about 79.0 % and 8.9 % higher than pure rGO and MWCNT memrbanes, respectively. The solar thermal conversion efficiency can reach up to 80.4 % without extra accessory for thermal management. Based on our results, the nanomorphology composite strategy is facile and effective for the development of novel photothermal membrane for high-efficiency evaporation, and contributes to the widespread application in the fields of desalination and wastewater treatment.

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Publication details

The article was received on 12 Oct 2017, accepted on 29 Nov 2017 and first published on 30 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08972D
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    A facile nanocomposite strategy to fabricate rGO-MWCNT photothermal layer for efficient water evaporation

    Y. Wang, C. Wang, X. Song, S. Kumar and H. Jiang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08972D

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