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Removal of Polyethylene Microplastics Using Wood Sawdust
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Scientists found that ordinary wood sawdust—even without any special treatment—can filter out over 99% of tiny plastic particles from water, simply by physically trapping them like a sieve. Since microplastics are increasingly showing up in our water, food, and even our bodies, this cheap and simple material could offer a low-cost way to clean up water supplies before these particles reach us. More research is needed to see if sawdust works as well against other types of pollution, but this is a promising, affordable first step.
ABSTRACT Microplastics (MPs) increasingly threaten environmental and human health due to their widespread presence in aquatic, terrestrial, and atmospheric systems. Yet scalable, cost‐effective removal technologies remain limited for MPs despite rising concern. This study investigated the use of wood sawdust, both unmodified (UMSD) and chemically modified (MSD) with tannic acid and ferric chloride (FeCl 3 ), as removal technologies for polyethylene (PE) MP remediation in aquatic systems. MSD was synthesized via a simple aqueous‐phase reaction, enhancing its surface functionality and increasing its negative surface charge. In a fixed‐bed column setup, both UMSD and MSD achieved over 99% removal efficiency for pristine PE MPs, sized 40 and 150 μm. Physical entrapment was the dominant mechanism of capture, with van der Waals forces likely contributing secondarily. The comparable performance of UMSD suggests that lignocellulosic biowaste holds potential for MP capture. These findings support the development of low‐cost, regenerative materials for water purification and warrant further study of their interactions with broader contaminant classes.
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Researchers created a plant-based water filter using wood sawdust coated with polyphenols (natural plant compounds) that captures over 99.9% of nano- and microplastics from water in a single pass. The filter works on many types and sizes of plastics and can be cleaned and reused multiple times. This bio-based approach could offer a practical, low-cost solution for removing plastic contamination from drinking water.
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.
Adsorption of polystyrene nanoplastics on sawdust-based activated carbons
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This study tested activated carbon filters made from sawdust waste for their ability to remove nanoplastics from water. The best-performing filter, activated with potassium hydroxide, had a very high surface area and effectively captured polystyrene nanoplastics through chemical interactions. This low-cost, waste-derived approach could help reduce the amount of nanoplastics in drinking water, which is important because these tiny particles can cross into body tissues.
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Researchers developed a superhydrophobic wood membrane that achieves 99.6% removal efficiency for microplastics smaller than 10 micrometers. The membrane, created by treating wood with methyltrichlorosilane, maintained its performance across varying water flow rates and demonstrated excellent reusability and environmental friendliness. The study offers a practical and sustainable filtration solution for removing the smallest and most difficult-to-capture microplastics from water.
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