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Integration of photothermal water evaporation with photocatalytic microplastics upcycling via nanofluidic thermal management
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Researchers designed a nanofiber reactor that simultaneously purifies water through solar-powered evaporation and breaks down microplastics using photocatalysis. The study achieved a high evaporation rate while converting microplastic pollutants into useful chemical products, demonstrating how both processes can work together in a single device by managing heat at the nanoscale.
Photothermal heating and photocatalytic treatment are two solar-driven water processing approaches by harnessing NIR and UV-vis light, respectively, which can fully utilize solar energy if integrated. However, it remains a challenge to achieve high performance in both approaches when integrated in a material due to uncontrollable heat diffusion. Here, we report a demonstration of heat confinement on photothermal sites and fluid cooling on photocatalysis sites at the nanoscale, within a well-designed heat and fluid confinement nanofiber reactor. Photothermal and photocatalytic nanostructures were alternatively aligned in electrospun nanofibers for on-demand nanofluidic thermal management as well as easy folding into 3D structures with enhanced light utilization and mass transfer. Such a design showed simultaneously high photothermal evaporation rate (2.59 kg m-2 h-1, exceeding the limit rate) and efficient photocatalytic upcycling of microplastics pollutant into valued products. Enabled by controlled photothermal heating, the valued main product (i.e., methyl acetate) can be evaporated out with 100% selectivity by in situ separation.
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Researchers developed a dual-functional solar evaporator by assembling PEI-coated viscose fibers and hydrophilic cotton fabric that simultaneously achieves microplastic adsorption and seawater desalination through photothermal evaporation, overcoming the single-function limitation of traditional water treatment evaporators.
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Researchers developed a solar-powered water purification system that simultaneously produces clean water and removes microplastics, achieving up to 5.5 times better microplastic removal than previous methods. The system uses sunlight to evaporate water, leaving contaminants including microplastics behind. This dual-purpose technology could help address both water scarcity and microplastic pollution, ultimately reducing human exposure through drinking water.
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Engineers designed a solar-powered water purification device using MXene nanomaterials that can remove up to 99% of microplastics from water while also filtering out heavy metals and killing bacteria. The device converts sunlight into heat to evaporate and purify contaminated water, and it remains effective even after exposure to extreme cold and UV aging. This technology could provide a low-cost way to produce clean drinking water in areas affected by microplastic pollution.
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