Converting Polyethylene Waste into Large Scale One-Dimensional Fe3O4@C Composites by a Facile One-Pot Process

Polyethylene-based waste plastics need hundreds of years to degrade in atmospheric conditions, so innovative upcycling processes are necessary in addition to traditional recycling services. This study presents an environmentally benign and solvent-free autogenic process, in which waste plastics such as waste polyethylene (PE) were converted into Fe 3 O 4 @C core–shell structures with about 800 nm in diameter and tens of micrometers in length with the presence of catalysts while oxygen was absent. The composition and morphology of the as-obtained Fe 3 O 4 @C core–shell structures were characterized by advanced structural, spectroscopic, and imaging techniques. The magnetic measurement at room temperature indicates that the values of saturation magnetization (22.5 emu/g) and coercivity (152.9 Oe) of the one-dimensional Fe 3 O 4 @C core–shell structures are different from those of Fe 3 O 4 nanoparticles and bulk Fe 3 O 4 due to the different carbon content, dipolar interaction, size, and morphology of the products. The results indicate that the one-dimensional Fe 3 O 4 @C core/shell structures possess well acid resistance.