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Issue 3, 2018
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A facile nanocomposite strategy to fabricate a rGO–MWCNT photothermal layer for efficient water evaporation

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Abstract

Solar-driven water evaporation assisted by photothermal membranes is considered as one of the sustainable and cost-effective strategies for pure water generation and wastewater treatment. Herein, we report a facile but effective approach to improve the photothermal performance by combining 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 a composite photothermal layer shows a rough surface with a controllable nano-structure, which can thus optimize solar light harvesting. On the other hand, the formation of a loose internal porous structure and suitable wettability ensure water transport inside the photothermal layer during evaporation. The surface temperature reaches as high as 78 °C even under one sun irradiation (1 kW m−2), which is 10 °C higher than the result of pure rGO membranes. When loaded on a PVDF substrate, the rGO–MWCNT based membrane is flexible and shows an obvious improvement in the evaporation rate, about 79.0% and 8.9% higher than those of pure rGO and MWCNT membranes, respectively. The solar thermal conversion efficiency can reach up to 80.4% without any extra accessory for thermal management. Based on our results, the nanocomposite strategy is facile and effective for the development of novel photothermal membranes for high-efficiency evaporation, and contributes to the widespread application in the fields of desalination and wastewater treatment.

Graphical abstract: A facile nanocomposite strategy to fabricate a rGO–MWCNT photothermal layer for efficient water evaporation

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Supplementary files

Article information


Submitted
12 Oct 2017
Accepted
29 Nov 2017
First published
30 Nov 2017

J. Mater. Chem. A, 2018,6, 963-971
Article type
Paper

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

Y. Wang, C. Wang, X. Song, S. K. Megarajan and H. Jiang, J. Mater. Chem. A, 2018, 6, 963
DOI: 10.1039/C7TA08972D

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