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Caught in the net: A quaternized wood fiber/chitin nanofibril hydrogel trap for polystyrene nanoplastics.
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Scientists created a sponge-like material made from wood and shellfish waste that can soak up huge amounts of nanoplastics, tiny plastic particles too small to see that have been showing up in our water, food, and even bloodstreams. Unlike many plastic-cleanup materials, this one is made entirely from natural, biodegradable ingredients, works well even in real-world water with other minerals present, and can be reused over 30 times before safely breaking down in soil. While this is still lab-stage research, it points toward a practical, eco-friendly way to filter nanoplastics out of water before they reach our bodies.
Nanoplastics pollution requires sustainable remediation technologies aligned with green chemistry and circular economy principles. Here, we report a fully biomass-derived, hierarchically structured hydrogel adsorbent for efficient removal of polystyrene nanoplastics (PSNPs). The hydrogel was fabricated by integrating quaternized wood fibers (QWF), derived from lignocellulosic biomass, with chitin nanofibrils (ChNFs), forming an interconnected micro-nano hierarchical porous network. Structural integrity was achieved through physical entanglement and hydrogen bonding, without toxic chemical crosslinkers during hydrogel formation. The cationic hierarchical architecture provided abundant electrostatic anchoring sites, internal diffusion pathways, and excellent mechanical stability, enabling a high adsorption capacity of 1940 mg g (calculated q: 2109 mg g) with rapid adsorption kinetics. The hydrogel also maintained strong performance (>750 mg g) in complex real-water matrices containing competing ions. Moreover, the adsorbent exhibited excellent reusability, retaining over 98% removal efficiency after 30 cycles via acid-assisted mechanical compression. The pristine hydrogel underwent complete biodegradation within 23 days in soil (ISO 17556), whereas the spent adsorbent collected after PSNP capture showed delayed but complete biodegradation within approximately 40 days. This work demonstrates a potentially scalable biomass-derived adsorbent matrix for environmentally responsible nanoplastics remediation. Overall, the design reconciles adsorption performance, regenerability, and end-of-life management in one practical platform.
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Green polyphenol-functionalized wood sawdust enables efficient capture of polystyrene nanoplastics: adsorption behavior and multiscale mechanistic insights
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Scientists created a natural, eco-friendly filter by coating sawdust with a compound found in green tea, and found it can effectively pull tiny plastic particles (nanoplastics) out of water. This matters because nanoplastics are increasingly showing up in our water supplies and are too small for many standard filters to catch, raising concerns about their potential to accumulate in our bodies, this study points to a cheap, reusable, plant-based way to help clean them up before they reach us.
Wood-Mimetic hierarchical porous sponges from Chitosan and tannin for efficient microplastic remediation and Closed-loop upcycling
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Scientists created a natural sponge made from chitosan (a substance from shellfish) and tannins (plant compounds) that can remove over 96% of tiny plastic particles from water in just 6 hours. The sponge mimics the structure of wood and can trap different types of microplastics, which are harmful particles that contaminate our drinking water and food supply. After the sponge is used up, it can be recycled into a device that purifies water using solar energy, making this a sustainable solution for cleaning up plastic pollution.
Nature-derived hydrogel for microplastic removal
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Scientists developed a nature-based hydrogel made from chitin and lignin that can remove nanoplastics from wastewater with very high efficiency, absorbing up to 1,791 milligrams of plastic per gram of material. This sustainable, reusable filter could help reduce the amount of tiny plastic particles that reach drinking water and ultimately the human body.
A circular "capture-and-upcycle" strategy for micro/nano-plastic remediation: From aquatic pollutants to fire-safe composites
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Scientists created a sponge-like material from wood waste that soaks up huge amounts of tiny plastic particles (microplastics and nanoplastics) from water — a pollution problem tied to potential health risks since these particles can end up in our bodies through drinking water and food. Instead of throwing away the used sponge material, the researchers found a clever way to press it into strong, fire-resistant building materials, turning a pollution cleanup byproduct into something useful rather than more waste. This "capture-and-reuse" approach offers a promising path for tackling microplastic contamination without creating new disposal problems.
Highly Efficient, Recyclable Microplastic Adsorption Enabled by Chitin Hydrogen Bond Network Rearrangement
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Scientists developed a foam made from chitin, a natural material found in seafood shells, that can absorb over 400 milligrams of nano-sized microplastics per gram of material, even in saltwater. This recyclable, sustainable approach could help clean microplastics from ocean water, and the recovered plastic can be converted into useful products.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.