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Scavenging Microplastics

CSEF · 2026 Earth & Environmental Sciences (Junior Division)

Michelle Zou

Overview

With over 5.25 trillion plastic fragments currently suffocating our oceans and decimating coral reef ecosystems, the search for a viable recovery method has become a race against time. Traditional filtration often proves invasive or inefficient for delicate environments. This experiment investigates a new strategy: the use of ferrofluids to magnetize and extract non-polar waste. The mechanism relies on molecular polarity; because microplastics are hydrophobic and ferrofluids are non-polar, they share a natural affinity. By introducing mineral oil as an adhesive bridge, plastic particles become trapped within a magnetic suspension. This study quantified how varying the volume of ferrofluid (Vf), ranging from 0 ml to 5 ml, impacted extraction efficiency within a controlled ten-second window. The results confirmed a direct, positive correlation: as ferrofluid concentration increased, the rate of plastic capture rose. While the 0 ml control group yielded zero recovery, the 5 ml trials demonstrated maximum efficiency, proving that magnetic nanoparticles can effectively bind to and remove toxins. Beyond the laboratory, these findings suggest a transformative shift in marine conservation. By repurposing ferrofluids, originally a NASA-engineered solution for zero-gravity fuel transport, we can transition from passive observation of oceanic decay to active, non-invasive remediation. As this technology scales, it offers a modular approach to water purification that can be integrated into existing wastewater infrastructure or deployed via autonomous “magnetic sweepers” in open water. This research provides a proof-of-concept for a future where we do not simply manage plastic pollution, but actively purge it from the biosphere, one nanoparticle at a time.

Competition history

  • CSEF 2026 Earth & Environmental Sciences (Junior Division) · Entry J-08-24

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