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Amino–MIL-101(Fe)/Chitosan–Graphene Oxide Cross-Linked Nanocomposite for High-Performance Adsorptive Remediation of Wastewater Microplastics from Environmental Samples
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This research documented plastic ingestion by shearwater seabirds, analyzing stomach contents to quantify plastic loads and identify polymer types. The study found widespread plastic consumption in shearwater populations, providing evidence of the pervasiveness of ocean plastic contamination in pelagic food webs.
One of the main sources of microplastic pollution in aquatic ecosystems is municipal wastewater, and preserving the ecological security of water depends on its effective removal. In this study, a potential multi-functionalized nanocomposite (NH2-MIL-101(Fe)/CS/GO), which consists of an iron-based metal–organic framework (NH2-MIL-101(Fe)) integrated with chitosan (CS) as a biopolymer matrix and graphene oxide (GO) as a conductive support, was exploited to enhance microplastic removal via different adsorptive hydrophilic/hydrophobic interactions. According to adsorption tests, the removal efficiencies of NH2-MIL-101(Fe)/CS/GO for polyethylene terephthalate (PET) and polystyrene (PS) microplastics (25–30 μm) were 93.8% and 89.7%, respectively, at pH 6.2 and for 40 min of contact time. Adsorption isotherms were well fitted to both the Langmuir and the Freundlich models, and the maximum adsorption capacities of PET and PS were 321.4 and 255.1 mg·g−1, respectively. The removal efficiency reached 92.5% after six cycles. The proposed MOF-based CS/GO nanocomposite provides an efficient and durable method of controlling microplastic contamination in urban wastewater. The developed multi-functionalized nanocomposite offers excellent electrostatic and hydrophobic synergy through a large surface area and π–π interactions for GO, positively charged CS, and a very high surface area with tunable porosity for the amino–MIL-101 (Fe) moiety. The proposed MOF-based nanocomposite provides an effective and persistent method of reducing microplastic contamination in constructed wetlands and water/wastewater treatment plants.
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This study fabricated a composite adsorbent (CSAC@MIL-100(Fe)) by growing MIL-100(Fe) metal-organic framework onto coconut shell activated carbon, achieving 97.4% removal efficiency for polystyrene microplastics from water. The material maintained 91.44% removal efficiency after seven regeneration cycles across a broad pH range, with adsorption governed by π-π interactions, electrostatic attraction, and coordination effects reaching a Langmuir maximum capacity of 746.27 mg/g.
Amino-Functionalized Chromium-Based Metal-Organic Framework NH2-MIL-101(Cr) for the Removal of Nanoplastics from Water
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Researchers synthesized an amino-functionalized chromium-based metal-organic framework, NH2-MIL-101(Cr) modified with 3-aminopropyltrimethoxysilane, and evaluated its capacity to remove polystyrene nanoplastics from water. The material achieved up to 97.5% removal efficiency with a maximum adsorption capacity of 508.39 mg/g, driven primarily by electrostatic attraction between the positively charged framework surface and negatively charged nanoplastic particles.
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Using computer simulations, researchers designed a composite nanomaterial made of graphene oxide and a metal-organic framework to filter microplastics from water. The study found that the composite was effective at adsorbing two common microplastic types, polyamide and polyurethane, with graphene oxide increasing the number of binding sites. The simulations suggest this material could be a promising candidate for practical microplastic removal from wastewater.
Metal-Organic Frameworks as robust adsorbents for Microplastic Removal – A review of Synthesis Strategies, Mechanistic insights and Computational studies
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Millions of tons of plastic waste end up in our oceans and water supply every year, breaking down into tiny microplastic particles that can carry toxic chemicals into our bodies and disrupt biological processes. This review paper rounds up recent research on a promising cleanup tool called Metal-Organic Frameworks (MOFs) — sponge-like materials with tiny pores that act like magnets, trapping and removing over 97% of microplastics from water in lab tests, even after being reused multiple times. While these materials aren't yet in widespread use, they represent a hopeful next step toward cleaner water and reduced microplastic
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Researchers developed chitosan-based hydrogel beads modified with aluminum and iron for removing PET microplastics from water. The aluminum-modified beads showed the best performance, achieving high microplastic removal efficiency through electrostatic interactions with the plastic particles. The study suggests that these sustainable, bio-based adsorbents could offer an effective and environmentally friendly approach to cleaning microplastic-contaminated water.
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