Solar-driven water evaporation offers a sustainable pathway for energy-efficient seawater desalination. However, its further practical performance is limited by salt accumulation during solar saline evaporation. Herein, a novel Janus composite membrane based on the assembly of hydrophilic vermiculite (VMT), multi-walled carbon nanotubes (MWCNTs), and hydrophobic polydimethylsiloxane (PDMS) is designed to function cooperatively for efficient solar absorption and long-term salt-rejection. The unique heterostructure endows the sandwich-like membrane with the capability of decoupling the steam generation process from the solar absorption surface to avoid the mutual interaction between the escaped steam and the incident light. Moreover, the tailorable hydrophilic/hydrophobic channels weaken the interaction between water molecules and layers, as well as reduce interlayer friction and water molecules viscosity to accelerate the flow rate. Benefiting from the above merits, the constructed vertical evaporator exhibits a high solar evaporation rate of 1.48 kg m⁻² h⁻¹ and an energy efficiency of 92% in saline water (3.5 wt% NaCl). Solar evaporation-induced soil remediation strategy on the basis of efficient removal of heavy metals and organic pollutants is further proposed, implying its potential applications in sustainable freshwater generation and environmental remediation.

太阳能驱动的水蒸发为节能海水淡化提供了一条可持续的途径。然而，其进一步的实际性能受到日晒盐蒸发过程中盐分积累的限制。在此，一种基于亲水性蛭石 (VMT)、多壁碳纳米管 (MWCNT) 和疏水性聚二甲基硅氧烷 (PDMS) 组装的新型 Janus 复合膜旨在协同发挥高效太阳能吸收和长期排盐的作用。独特的异质结构赋予三明治状薄膜将蒸汽产生过程与太阳能吸收表面解耦的能力，从而避免逸出的蒸汽与入射光之间的相互作用。此外，可定制的亲水/疏水通道削弱了水分子和层之间的相互作用，以及降低层间摩擦和水分子粘度以加快流速。受益于上述优点，构建的立式蒸发器具有1.48 kg m的高太阳能蒸发率^-2  h ^-1并且在盐水（3.5 wt% NaCl）中的能量效率为 92%。进一步提出了基于有效去除重金属和有机污染物的太阳能蒸发诱导土壤修复策略，暗示其在可持续淡水生产和环境修复中的潜在应用。