Northwest A&F University researchers have engineered a solar-powered system that can pull both freshwater and critical boron—a key fuel for hypersonic missiles—directly from seawater, according to findings published in the journal Science Bulletin. Led by Professor Fan Zhimin, the team achieved a maximum boron extraction of 225.52 milligrams per square meter, using nothing but sunlight to power the entire process.
Imagine pulling a vital ingredient for next-generation weapons and green technology straight from the ocean, powered only by the sun. This isn’t science fiction; it’s a new reality being shaped in a laboratory in China. A team of scientists has engineered a clever two-for-one system that tackles water scarcity and secures a critical mineral, all with a simple sheet of gel.
The innovation centers on boron, a lightweight element with heavyweight importance. Beyond its industrial uses, boron serves as a high-energy solid fuel for scramjet engines that propel hypersonic weapons. As Professor Fan Zhimin of the Shaanxi Provincial Key Laboratory at Northwest A&F University explains, access to such critical elements is a strategic imperative.
“Solar-driven interfacial evaporation has emerged as a novel sustainable technology for freshwater production,” the team noted in their paper. Recent advances, they added, have shown it can also extract valuable elements from seawater.
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The team’s breakthrough is a composite gel they call MMS. It’s surprisingly elegant in its construction, using a base of natural sodium alginate mixed with two high-tech components. The first is MXene, a nanomaterial with a graphene-like structure that is exceptionally efficient at converting sunlight into heat. The second is MgO (magnesium oxide), which acts like a microscopic sponge specifically designed to grab and hold boron ions.
Here’s how it works: a thin, 2mm (0.08 inch) sheet of the MMS gel is floated on seawater. The top layer, laced with MXene, soaks up sunlight and gets hot, causing freshwater to evaporate from its surface. This evaporation creates a suction effect, constantly pulling new seawater up through the gel’s porous structure.
As the water moves through, the MgO nanoparticles embedded within it selectively capture the boron, reported South China Morning Post (SCMP). The result is a continuous output of clean water and a gel increasingly enriched with the valuable element.
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In lab tests, the system impressed with its dual efficiency. It achieved a freshwater evaporation rate of 2.14kg (4.7lbs) per square meter per hour while accumulating 225.52mg of boron. But the real test came outdoors. The team took a prototype to Hong Kong for a three-hour run in March, a month not known for intense sun. Despite the conditions, the gel produced 5.20kg of water and extracted 122.45mg of boron per square meter, and critically, the condensed water was completely free of boron contamination.
Durability is often the hurdle for new materials, but the MMS gel appears robust. The research paper states that after being used and regenerated seven times, the gel retained over 86 percent of its boron-adsorption capacity, with almost no drop in its water evaporation performance. This reusability is key for practical, large-scale applications.
Why does this matter so much? Globally, boron production is dominated by Turkey and the United States, while China is the world’s largest consumer. This new technology could potentially alter supply chain dynamics by providing an alternative, diffuse source. Furthermore, as SCMP reported, traditional desalination plants using reverse osmosis cannot remove trace boron and may even concentrate it, creating a health concern in drinking water. This solar gel solves that problem while capturing the mineral as a resource.
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“We have demonstrated that the engineered MMS exhibits great potential for simultaneously producing freshwater and extracting boron from seawater,” concluded Professor Fan. The team acknowledges that the next big conversations will be about “cost and scalability,” especially for large-scale applications. If those challenges can be met, this sun-powered sponge could represent a significant leap in sustainable resource extraction.
