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New Nanocomposite Improves Solar Evaporation For Water Purification by Li Yuan

Global drinking water scarcity is a severe problem for humans. Water purification consumes a large amount of fossil energy and generates secondary pollution. Solar-thermal interfacial evaporation has been considered the most promising strategy for addressing this problem. However, developing an optimized material featuring both efficient solar-vapor conversion and good environmental tolerance still remains challenging. HoMS decreases the energy required for water evaporation. Simulation results show that HoMS establishes a thermal field gradient, thus providing the driving force for vapor evaporation. “HoMS also benefits water transport,” said Wang, “The confined cavities in HoMS promote liquid water diffusion owing to the capillary pumping effect, and the nanopores in HoMS induce water molecules to evaporate in the form of clusters, thus enabling evaporation with less enthalpy.” With highly efficient photoabsorption and photothermal conversion, a super-fast evaporation speed of 4.02 kg m-2h-1 has been achieved. The evaporation speed barely changed after 30 days, and with no salt accumulation, indicating a long-term stability. Notably, the concentration of pseudovirus SC2-P could be decreased by six orders of magnitude after evaporation.
https://phys.org/news/2021-11-nanocomposite-solar-evaporation-purification.html

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