Synthesis and characterization of biomimetic Fe3O4/coke magnetic nanoparticles composite material

A composite material (Fe3O4/Coke) using coke supported Fe3O4 magnetic nanoparticles was successfully prepared via an in-situ chemical oxidation precipitation method and characterized by SEM, XRD, Raman, and FTIR. The results showed that the Fe3O4 nanoparticles existed steadily on the surface of coke, with better dispersing and smaller particle size. The catalytic ability of Fe3O4/Coke were investigatied by degrading p-nitrophenol (P-NP). The results showed that the apparent rate constant for the P-NP at 1.0 g·L−1 catalyst, 30 mmol·L−1 H2O2, pH=3.0, 30 °C and the best ratio of Coke/Fe3O4 0.6, was evaluated to be 0.027 min–1, the removal rate of CODCr was 75.47%, and the dissolubility of Fe was 2.42 mg·L–1. Compared with pure Fe3O4, the catalytic ability of Fe3O4/Coke in the presence of H2O2 was greatly enhanced. And Fe3O4/Coke was a green and environmental catalyst with high catalytic activity, showing a good chemical stability and reusability.