Solar desalination is currently considered as one of the most hopeful approaches to produce freshwater in a green and sustainable way. Herein, a mass-produced, low-thermal conductive, self-floating, and porous radish was selected as the substrate to construct a 3D-Janus evaporator for long-term solar desalination. The 3D-Janus radish-based evaporator revealed strong light absorption characteristics (absorbing >90% of the light ranging from 250 to 2500 nm) due to the addition of multi-walled carbon nanotubes (MWCNTs, an excellent light absorber). Meanwhile, the poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) endowed the hydrophilic radish (water contact angle (WCA) of 33°) with a hydrophobic surface (WCA of 126°) to achieve Janus characteristic. During the evaporation test, a 3D-MWCNTs@PVDF-HFP/Radish revealed an evaporation rate of 2.35 kg m⁻² h⁻¹ with a light-to-heat conversion of ~121.6% under a simulated solar irradiation. Also, the 3D-MWCNTs@PVDF-HFP/Radish presented an excellent salt-resistance even in evaporating 20 wt% NaCl solution for 10 consecutive days, without surface salt accumulation. Meanwhile, the salt removal capacity was over 99%, suggesting such excellent evaporator can supply pure water with low ion concentration from the actual high salinity seawater. This self-floating, salt-resistant 3D Janus radish evaporator offer a potential choice for future practical applications of biomass solar desalination.

目前，太阳能淡化被认为是以绿色和可持续的方式生产淡水的最有希望的方法之一。在此，选择大量生产的低导热，自浮性和多孔性萝卜作为基质，以构建用于长期太阳能脱盐的3D-Janus蒸发器。由于添加了多壁碳纳米管（MWCNT，一种出色的光吸收剂），基于3D-Janus萝卜的蒸发器显示出强大的光吸收特性（吸收了90％的250至2500 nm的光）。同时，聚（偏二氟合作-六氟丙烯）（PVDF-HFP）使亲水萝卜（水接触角（WCA）为33°）具有疏水表面（WCA为126°），从而获得Janus特性。在蒸发测试期间，3D-MWCNTs @ PVDF-HFP / Radish的蒸发速率为2.35 kg m ^-2 h ^-1在模拟太阳辐射下的光热转换率为〜121.6％。同样，即使连续蒸发20 wt％NaCl溶液连续10天，3D-MWCNTs @ PVDF-HFP / Radish仍具有出色的耐盐性，而不会积聚表面盐分。同时，除盐能力超过99％，表明这种出色的蒸发器可以从实际的高盐度海水中提供离子浓度低的纯净水。这种自浮式，耐盐的3D Janus萝卜蒸发器为生物质太阳能脱盐的未来实际应用提供了潜在的选择。