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Remediation of Urban Water Contaminated by Microplastics Using Magnetic Nanoparticles and Biosurfactant
Summary
Scientists created a magnetic cleanup tool—tiny iron particles coated with a natural soap-like substance—that pulled 95% of microplastic pollution out of contaminated water samples in lab tests. Because the particles are magnetic, they can be collected and reused afterward, preventing them from becoming a new source of pollution themselves. This matters because microplastics in our water supply are a growing health concern, and this low-cost method could one day be added to city water treatment systems to help filter them out before they reach our taps.
Objective: This study aimed to develop and evaluate a remediation method for microplastics in urban natural waters based on magnetic iron oxide (Fe₃O₄) nanoparticles functionalized with the biosurfactant surfactin. Theoretical Framework: Synthetic polymers exhibit high environmental persistence and, when improperly disposed of, fragment into microplastics that accumulate in aquatic systems and can act as vectors for organic pollutants. The removal of these contaminants from water still faces technological limitations, especially given the lack of specific tertiary treatments and their diffuse dispersion in stormwater. Method: Polystyrene microplastics were used as an experimental model, and the tests were conducted under controlled conditions. The operational parameters were optimized with respect to contact time, pH, and volume of nanocomposite applied. Results and Discussion: Under optimized conditions, an approximate removal efficiency of 95% was achieved in artificially contaminated urban natural water samples. The possibility of magnetic recovery of the adsorbent material reinforces the potential for reuse and reduces the risk of secondary dispersion into the environment. Research Implications: The results demonstrate the technical feasibility of the approach, indicating potential application as a complementary technology in urban water treatment systems aimed at removing microplastics and improving the quality of life for the population. Originality/Value: Studies regarding microplastics in water, as well as their consequences for public health, are still scarce and require further empirical investigation. In this sense, this work presents an original method for decontaminating water from microplastics using relatively low-cost materials.