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.

中文翻译：

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组装具有低成本和脱盐功能的 Janus 复合体，用于太阳能热水蒸发

界面太阳能-热水蒸发（STWE）在从海洋中收集淡水方面显示出相当大的潜力；其中，设计一种低成本、抗盐沉积的高效可浮材料一直是人们最关心的问题之一。在这项工作中，我们通过组装商业碳纳米管和多孔棉纤维纸，通过硅烷化和聚电解质的组合功能化，为 STWE 制备了一种经济的 Janus 复合物。由于有效的光热转换、局部热层和水和蒸汽的快速传输的协同作用，Janus 复合体在盐水中在 5 个太阳 (5 kW m-2) 下显示出 3.443 kg m-2 h-1 的优异蒸发率。此外，在使用过的 Janus 复合物中几乎没有检测到盐分，由于聚电解质的强离子强度，盐沉积在源头被拒绝。这些结果表明，Janus 复合物在水净化方面具有潜在的应用价值。