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C─S Bonds Modulated Nanointerface Tension to Create Stable Magnetic Hollow Nanocarbons for Efficient Microplastics Capture
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Scientists created magnetic hollow carbon nanoparticles that can capture microplastics from water with 100% efficiency in just 10 seconds. The key innovation was adding sulfur to the carbon structure, which made the particles stable and effective across different water conditions including varying salt levels and acidity. This technology could eventually help clean microplastics from contaminated water sources, potentially reducing human exposure through drinking water.
Microplastic pollution poses significant threats to aquatic ecosystems and human health. Hollow nanomaterials are promising adsorbents for microplastics remediation due to their tailorable architectures, functions, and large contact area. Nevertheless, the structural stability of well-defined nanostructures has always been a critical factor, and understanding the stability principle is desired. Herein, we fabricated magnetic hollow nanocarbons as "nano-analytical tool", revealing that the stability is related to additional pressure caused by nanointerface tension at curved carbon shell surface. To mitigate this, we introduced C─S bonds by sulfurizing carbon matrix, suppressing the condensation of oxygen-containing groups and thereby reducing interface tension. As a showcase, the stable hollow Fe3O4@C/S enabled rapid and efficient microplastics capture (100% within 10 s, 53 600 mg g-1 capacity) under an alternating magnetic field, owing to the magnetically accelerated mass transfer and increased contact area. Additionally, sulfur modification broadens applicability range where carbon surface is oppositely charged to microplastics, expanding the universality in capturing multiple types of microplastics, even under challenging conditions including different pH and salinities. This work offers guidance into the precise synthesis of hollow nanomaterials from nanointerface perspective. The design principles involving sulfur modification and high-contact area may open prospects for high-capacity microplastics capture in complex aquatic environments.
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C─S Bonds Modulated Nanointerface Tension to Create Stable Magnetic Hollow Nanocarbons for Efficient Microplastics Capture
AI summary Read the abstract
Researchers synthesized magnetic hollow nanocarbons with C-S bonds to create a stable adsorbent for capturing microplastics from water. The material's interface properties enabled efficient microplastic attachment across a range of particle sizes and polymer types, while the magnetic core allowed easy recovery from treated water.
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