Solar steam generation (SSG) emerges as a paramount technology for efficient and sustainable desalination and wastewater purification. The innovative development of porous aerogel materials for solar steam generation heralds a new era in photothermal materials. In this study, a category of β-cyclodextrin-grafted graphene oxide/sodium anionic polysaccharide alginate composite aerogels (named GO-CD/SA) with solar steam generation behavior and wastewater purification properties is developed. GO-CD/SA demonstrates remarkable properties, including an impressive solar absorption efficiency of approximately 97.4 %, a low thermal conductivity of just 0.124 W m⁻¹ K⁻¹ in a wetted state, and exceptional superhydrophilicity. These attributes collectively contribute to GO-CD/SA achieving an evaporation rate of 1.79 kg m⁻² h⁻¹ when utilized with pure water. Furthermore, GO-CD/SA features an abundant three-dimensional porous structure (88.07 % porosity) and superhydrophilic properties that promote the rapid reflux of salt solution between the pore channels. This, in turn, enables excellent salt resistance, with no noticeable salt crystals precipitating during continuous evaporation in 20 % high concentration brine for 6 h. GO-CD/SA also demonstrates outstanding purification capabilities for organic dye wastewater and heavy metal ion wastewater. Therefore, this work combines the advantages of salt tolerance and wastewater treatment, paving the way for the exploration of natural polysaccharide-based photothermal materials.

太阳能蒸汽发电 (SSG) 已成为高效、可持续海水淡化和废水净化的重要技术。用于太阳能蒸汽发电的多孔气凝胶材料的创新发展预示着光热材料的新时代。在这项研究中，开发了一类具有太阳能蒸汽产生行为和废水净化性能的β-环糊精接枝氧化石墨烯/阴离子多糖海藻酸钠复合气凝胶（命名为GO-CD/SA）。GO-CD/SA 表现出卓越的性能，包括令人印象深刻的约 97.4% 的太阳能吸收效率、润湿状态下仅为 0.124 W m ^-1  K ^-1的低导热率以及卓越的超亲水性。这些属性共同有助于 GO-CD/SA在与纯水一起使用时实现 1.79 kg m ^-2  h ^{-1的蒸发率。}此外，GO-CD/SA具有丰富的三维多孔结构（孔隙率88.07%）和超亲水特性，可促进盐溶液在孔道之间的快速回流。这反过来又实现了优异的耐盐性，在 20% 高浓度盐水中连续蒸发 6 小时时没有明显的盐晶体沉淀。GO-CD/SA对于有机染料废水和重金属离子废水也表现出出色的净化能力。因此，这项工作结合了耐盐性和废水处理的优点，为天然多糖基光热材料的探索铺平了道路。