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Polydopamine-modified sodium alginate hydrogel for microplastics removal: Adsorption performance, characteristics, and kinetics
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Scientists created a hydrogel made from seaweed-based sodium alginate coated with polydopamine that can remove up to 99.6% of microplastics from drinking water. The hydrogel works regardless of the microplastics' size or surface charge, and it can be reused multiple times, making it a promising low-cost tool for reducing microplastic exposure through tap water.
The potential health hazards of micro/nanoplastics in food have become a significant concern. This study developed a Polydopamine-modified sodium alginate hydrogel (PMSAH) for removing microplastics in daily drinking water. The hydrogel's performance, characteristics, and kinetics for microplastic removal were systematically evaluated. Results demonstrated that the incorporation of polydopamine reduced the hydrogel's surface zeta potential and increased its adsorption capacity for microplastics. PMSAH5 exhibited the highest removal efficiency, reaching approximately 99.6 %. Additionally, polydopamine-modified sodium alginate hydrogel exhibited higher elasticity and thermal stability. The hydrogel successfully adsorbed microplastics, regardless of their size and surface charge. This adsorption was driven by the combined action of multiple forces, resulting in multilayer adsorption. The unique advantages of polydopamine-mediated multi-molecular interactions present a promising and environmentally friendly approach for effective removal of microplastics in daily drinking water.
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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.
Ultralight sponge made from sodium alginate with processability and stability for efficient removal of microplastics
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Researchers developed an ultralight sponge made from sodium alginate, a natural seaweed-derived material, that can efficiently capture and remove microplastics from water. The sponge demonstrated high water absorption and strong microplastic removal capabilities while remaining stable and reusable. The study suggests this low-cost, biodegradable material could be a practical solution for filtering microplastic pollution from marine environments.
Eco-friendly hydrophobic ZIF-8/sodium alginate monolithic adsorbent: An efficient trap for microplastics in the aqueous environment
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Scientists created an eco-friendly sponge-like material made from a metal-organic framework (ZIF-8) and seaweed-based sodium alginate that can trap microplastics from water. The material removed up to 594 milligrams of microplastics per gram of adsorbent and worked well even in real-world water samples like tap water, river water, and seawater. This type of practical, reusable filter material could help reduce the amount of microplastics reaching drinking water supplies.
Unveiling the removal mechanism of nanoplastics by hydroxyethylene diphosphonic acid modified sodium alginate three-dimensional membrane capsules: A combined experimental and DFT study
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Researchers synthesized three-dimensional sodium alginate membrane capsules modified with hydroxyethylene diphosphonic acid to capture nanoplastics from water, achieving over 80% removal efficiency across seven reuse cycles through a combination of hydrogen bonding, ligand exchange, and electrostatic attraction — with size selectivity favoring sub-100 nm particles.
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