August 2025 Metallurgy Blog
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August 6, 2025
Turning Landfill Waste into Iron Oxide Nanoparticles
Turning Landfill Waste into Iron Oxide Nanoparticles
In a recent study published in RSC Sustainability, a team of environmental engineers demonstrated how expired over-the-counter iron supplements could be transformed into iron oxide nanoparticles through an eco-friendly process called hydrothermal carbonization. This water-based method operates at lower temperatures than conventional techniques and avoids the use of harsh chemicals, making it a greener alternative.
The nanoparticles produced (primarily magnetite and maghemite) possess unique magnetic and chemical properties. These qualities make them ideal for applications ranging from advanced electronics and magnetic memory storage to removing heavy metals and oil from polluted water. In testing, the team found that these particles removed over 95% of methylene blue dye from wastewater and could be retrieved afterward with a simple magnet.
While this lab-scale project focused on expired supplements, the potential to scale is significant. Vast quantities of iron-rich waste (such as steel sludge and metal scrap) end up in landfills each year. If recovered and processed sustainably, they could supply the growing demand for materials in sectors like clean energy, water treatment, and high-performance computing. Learn more about this topic here.
The nanoparticles produced (primarily magnetite and maghemite) possess unique magnetic and chemical properties. These qualities make them ideal for applications ranging from advanced electronics and magnetic memory storage to removing heavy metals and oil from polluted water. In testing, the team found that these particles removed over 95% of methylene blue dye from wastewater and could be retrieved afterward with a simple magnet.
While this lab-scale project focused on expired supplements, the potential to scale is significant. Vast quantities of iron-rich waste (such as steel sludge and metal scrap) end up in landfills each year. If recovered and processed sustainably, they could supply the growing demand for materials in sectors like clean energy, water treatment, and high-performance computing. Learn more about this topic here.
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