Solar-driven interfacial evaporation (SIE) is a promising fresh water acquisition technology to address the global water resource shortage. Therefore, solar evaporators with efficient photothermal conversion efficiency and multifunctional purification capabilities are still in high demand. At present, a variety of photothermal conversion materials have been explored, however, there are few studies on integrating interfacial evaporation and photocatalytic capabilities into one solar steam generation system collaboratively. In this work, a new double-layered solar interfacial evaporator (MXene/PPy-ACA) was fabricated by using polymeric ionic liquid grafted attapulgite (ATP-PIL) as the matrix and modified the upper surface by MXene and polypyrrole (PPy). The evaporator can not only carry out seawater desalination efficiently, but also has good photocatalytic degradation effect on organic dyes. The MXene/PPy-ACA achieves an evaporation rate of 1.53 kg m h and corresponding to an efficiency of 92.17 % under irradiation of 1 sun. In addition, duing to the ionic repulsion effect of ATP-PIL, the MXene/PPy-ACA possesses good salt resistance. When tested in 20 wt% high brine, the evaporation rate is measured to be 1.40 kg m h. Moreover, owing to the superb photocatalytic properties of MXene and PPy, the MXene/PPy-ACA exhibits remarkable photocatalytic efficiency towards organic dyes, achieving degradation rates of 94.9 %, 67.49 %, and 65.11 % for methyl orange (MO), rhodamine B (RhB), and methylene blue (MB), respectively. The prepared interfacial evaporation system can also run stably in acid and alkali solution, and has a good practical application prospect. This study may offer an alternative approach in achieving clean water via SIE of seawater and complex wastewater.

中文翻译：

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基于聚合物离子液体接枝凹凸棒土和MXene/PPy的双层太阳能蒸发器，用于高效脱盐和光降解

太阳能驱动界面蒸发（SIE）是一种很有前景的淡水获取技术，可以解决全球水资源短缺问题。因此，具有高效光热转换效率和多功能净化能力的太阳能蒸发器仍然需求旺盛。目前，人们已经探索了多种光热转换材料，但将界面蒸发和光催化能力协同集成到太阳能蒸汽发生系统中的研究还很少。本工作以聚合离子液体接枝凹凸棒石（ATP-PIL）为基体，通过MXene和聚吡咯（PPy）对上表面进行改性，制备了一种新型双层太阳能界面蒸发器（MXene/PPy-ACA）。该蒸发器不仅可以高效地进行海水淡化，而且对有机染料具有良好的光催化降解效果。MXene/PPy-ACA 在 1 个太阳照射下的蒸发速率为 1.53 kg·m·h，对应的效率为 92.17%。此外，由于ATP-PIL的离子排斥作用，MXene/PPy-ACA具有良好的耐盐性。当在 20 wt% 高盐水中进行测试时，测得蒸发速率为 1.40 kg·m·h。此外，由于MXene和PPy优异的光催化性能，MXene/PPy-ACA对有机染料表现出显着的光催化效率，对甲基橙（MO）、罗丹明B（分别是 RhB) 和亚甲蓝 (MB)。所制备的界面蒸发系统在酸碱溶液中也能稳定运行，具有良好的实际应用前景。这项研究可能提供一种通过海水和复杂废水的 SIE 获得清洁水的替代方法。