Abstract Solar-driven water evaporation is a method to make seawater sustainable by producing lower levels of greenhouse gases at present. Herein, we prepared an efficient, flexible and lightweight reduced graphene oxide (rGO)/ polyacrylonitrile (PAN) composite membrane by a simple electrospinning technology for photothermal desalination. After blending with rGO, the electrospun membrane exhibited a strong light absorption property in a wide spectral pectrum and can absorb more than 80% of the light. More importantly, the prepared rGO/PAN membrane presented advantages of good heat localization and high evaporation efficiency. When placed on a thermal barrier made by polystyrene foam, it converts 89.4% of the light into heat, allowing 1.46 kg m−2 of seawater to evaporate in an hour under one sun. Meanwhile, the rGO/PAN membrane was used as a steam generator to obtain the pure water with low ion concentration (Na+: 0.61 mg L−1, Mg2+: 0.67 mg L−1, K+: 1.71 mg L−1, and Ca2+: 0.48 mg L−1) from high salinity simulating seawater. Based on the results, the rGO/PAN membrane provides a new avenue for large-scale photothermal application in the field of seawater desalination.

中文翻译：

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用于高性能太阳能蒸发的电纺还原氧化石墨烯/聚丙烯腈膜

摘要 目前，太阳能驱动的水蒸发是一种通过产生较低水平的温室气体来使海水可持续的方法。在此，我们通过简单的静电纺丝技术制备了一种高效、灵活且重量轻的还原氧化石墨烯（rGO）/聚丙烯腈（PAN）复合膜，用于光热脱盐。与rGO混合后，电纺膜在宽光谱范围内表现出很强的吸光性，可以吸收80%以上的光。更重要的是，所制备的 rGO/PAN 膜具有良好的热定位性和高蒸发效率的优点。当放置在由聚苯乙烯泡沫制成的热障上时，它将 89.4% 的光转化为热量，在一个阳光下，1 小时内可以蒸发 1.46 kg m-2 的海水。同时，rGO/PAN 膜用作蒸汽发生器，获得低离子浓度的纯水（Na+：0.61 mg L-1，Mg2+：0.67 mg L-1，K+：1.71 mg L-1，Ca2+：0.48 mg L−1) 来自高盐度模拟海水。基于研究结果，rGO/PAN膜为海水淡化领域的大规模光热应用提供了新的途径。