Photothermal‐Photocatalysis System by Photosensitive Covalent Organic Framework@Wood for Efficient Solar‐Driven Water Evaporation and Uranium Removal

Abstract The efficient utilization of solar energy is crucial for solving the shortage crisis of fresh water and sustainable development. Herein, a new covalent organic framework@wood (COF@wood) platform is being constructed for efficient interfacial solar steam generation and solar‐driven uranium removal. Photosensitive components and redox active sites are integrated into the COFs, replacing simple photothermal coatings and providing active sites for photocatalysis. The multi‐level pore structure of wood ensures uniform material distribution, and its hydroxyl and carboxyl groups improve COF wettability, facilitating rapid water transmission, and efficient energy use. The Ni‐porphyrin‐based COF@wood achieves a high evaporation efficiency of 2.07 kg m −2 h −1 and a uranium removal rate of about 93%. This photothermal–photocatalysis system could not only utilize the infrared wavelength for photothermal evaporation to facilitate the generation of clean water, but also simultaneously leverage the ultraviolet and visible wavelength bands for solar photocatalysis to achieve the conversion of solar energy into chemical energy for removing soluble uranium. This approach contributes to addressing the challenges of freshwater resources and energy shortages. Such a strategy offers a superior model for harnessing the full solar spectrum to tackle practical issues.