Janus electrospun MXene-based photothermal membrane for efficient solar-driven interfacial evaporation and simulated radioactive wastewater treatment.

An electrospun MXene-based Janus membrane (PMPJ-7) achieves 1.84 kg m-2·h-1 evaporation under 1 sun and 96.5% photothermal conversion efficiency.

• Why it matters: Solar-driven interfacial evaporation can treat radioactive wastewater with low energy, but salt accumulation limits performance in high-salinity conditions.
• What they did: PMPJ was built with hydrophobic PVDF/MXene photothermal and hydrophilic PAN water-transport layers, and bilayer thickness ratios were tuned to balance water delivery, heat localization, vapor escape, and salt buildup.
• The result: In high-salinity simulated radioactive wastewater, PMPJ-7 reduced Co2+, Sr2+, Cs+, and I- in condensate with decontamination factors of 10 5.82, 10 5.09, 10 5.58, and 10 4.11, with >99.99% removal and stable cyclic evaporation.

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