Spherical Architecture of Bamboo Lignocellulosic Aerogels for Enhanced Solar‐Driven Evaporation and Antisalt Accumulation

Abstract Environmental challenges, including shortages of clean fuel and freshwater, have a significant impact on human health and economic development. The bio‐based evaporator harnessing solar energy for clean‐water harvesting holds great promise for sustainable photothermal conversion. Inspired by bamboo, a fabrication strategy is developed for spherical architecture featuring a centrosymmetric radial channel, which transforms lignocellulosic aerogel through freezing and hydrogen bond regulation. The lignocellulosic aerogel features porous surface and centrosymmetric radial channel, which facilitates efficient photothermal conversion, water vapor transport, and antisalt accumulation. The aerogel evaporator achieves an efficient evaporation rate of 1.49 ± 0.05 kg m −2 h −1 at 1 kW m −2 , representing a 4.23 enhancement factor. Owing to its stable self‐floating, self‐cleaning and balanced sensitivity for unrestricted rotation in all directions, the aerogel evaporator demonstrates remarkable adaptability to diverse solar angles and water salinity. Even at a 0° angle and 20 wt.% NaCl, the evaporator retains 97.3% and 78.9% efficiency compared to DI water at 90°. Furthermore, the self‐cleaning properties of the evaporation surfaces effectively mitigate the effects of salt accumulation during seawater evaporation. This research introduces an innovative aerogel methodology that integrates spherical lignocellulosic aerogel in bamboo design, thereby enhancing the stability and sustainability of solar‐driven evaporation.

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