Assembly of Janus complex with low-cost and salt rejection for solar-thermal water evaporation
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Assembly of Janus complex with low-cost and salt rejection for solar-thermal water evaporation Dingding Li1, Qingxin Zhou1, Gang Wang1, Hang Zhao1, Shenghua Ma1,* Kunyue Leng1,*, Yi Wang1,*, and Jinbo Bai2,*
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1
Shaanxi Joint Lab of Graphene, State Key Lab Incubation Base of Photoelectric Technology and Functional Materials, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & PhotonTechnology, Northwest University, Xi’an 710069, China 2 Laboratoire Mécanique Des Sols, Structures Et Matériaux (MSSMat), CNRS UMR 8579, Ecole CentraleSupélec, Université ParisSaclay, 8-10 rue Joliot-Curie, 91190 Gif-sur-Yvette, France
Received: 1 February 2020
ABSTRACT
Accepted: 11 August 2020
Interfacial solar-thermal water evaporation (STWE) shows considerable potential in terms of harvesting freshwater from the ocean; thereinto, the design of an efficient floatable material with low-cost and salt deposition resistance is always one of the most concerned issues. In this work, we prepared an economical Janus complex for STWE by assembling commercial carbon nanotubes and porous cotton fiber paper, functionalized by silanization and combination of polyelectrolyte. Because of the synergy of efficient photothermal conversion, localized hot layer and fast transmission of water and vapor, the Janus complex displayed a superior evaporation rate of 3.443 kg m-2 h-1 under 5 suns (5 kW m-2) in saltwater. Moreover, almost no salt was detected in the used Janus complex, and the salt deposition was rejected at the source due to the strong ionic strength of polyelectrolyte. These results indicated that the Janus complex has potential applications for water purification.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Introduction How to alleviate the shortages of drinking water has long been a global problem as the rapid prosperity of the world, especially in underdeveloped regions [1, 2]. Thereinto, the most concern may be purifying water with sustainable technology [3]. As this concern, collecting drinking water from ocean through water evaporation derived by solar harvesting has
aroused great attention, due to the abundant reserves and economical sustainable of solar energy [4, 5]. Light harvesting is commonly a direct process that absorbs solar radiation in a heat transfer fluid, but to promote water collection, an indirect process involves the absorption of incident photons and heat transfer from light-absorbing surface to surrounding media is usually practiced over solar harvesting materials. To achieve this indirect process, efficient solar harvesting materials need to be elaborated.
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https://doi.org/10.1007/s10853-020-05108-1
J Mater Sci
Currently, various materials have been developed to face the challenge [6], especially the materials with ‘‘black photothermal’’ nature [7], such as single- or multilayer carbon-based materials [8–10],
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