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The pre-liminary study on surface modification of magnetite for microplastic removal from water
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This study explored combining magnetic separation and surface-based separation techniques from mineral processing to remove polypropylene, polyethylene, polystyrene, PET, and PVC microplastics from water using magnetite powder. Surface modification of magnetite was investigated as a key step to improving selectivity and removal efficiency.
Abstract Microplastics (MPs), the plastic particles with size fraction smaller than 5 mm, are recently becoming one important problem worldwide due to their ubiquitous distribution in the environment, especially in water. In this study, the separation techniques in mineral processing (i.e., magnetic separation and surface-based separation) were applied to remove MPs from contaminated water. Five kinds of model MPs samples (+38−2000 μm); polypropylene (PP), polyethylene (PE), polystyrene (PS), polyethylene terephthalate (PET), and polyvinyl chloride (PVC) were used and magnetite (Fe 3 O 4 ) powders (−75 μm) were modified using hexadecyltrimethoxysilane (HDTMS) to change their surface from hydrophilic to hydrophobic for MPs recovery. The results showed that MPs could be attached on the surface of modified magnetite due to the hydrophobic interaction and could be recovered together with modified magnetite by magnetic separation.
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