A composite material(Fe_3O_4/Coke)using coke supported Fe_3O_4 magnetic nanoparticles was successfully prepared via an in-situ chemicaloxidation precipitation method and characterized by SEM,XRD,Raman,and FTIR.The results showed that the Fe_3O_4 nanoparticles existed steadily on the surface of coke,with better dispersing and smaller particle size.The catalytic ability of Fe_3O_4/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) H_2O_2,pH=3.0,30 ℃ and the best ratio of Coke/Fe_3O_4 0.6,was evaluated to be 0.027 min^(-1),the removalrate of CODCr was 75.47%,and the dissolubility of Fe was 2.42 mg·L^(-1).Compared with pure Fe_3O_4,the catalytic ability of Fe_3O_4/Coke in the presence of H_2O_2 was greatly enhanced.And Fe_3O_4/Coke was a green and environmentalcatalyst with high catalytic activity,showing a good chemicalstability and reusability.
Magnetically modified Fe-Al pillared bentonite(Fe3O4/ Fe-Al-Bent) was prepared via chemical co-precipitation method and characterized by powder X-ray diffraction(XRD), Brunauer-EmmettTeller(BET), Fourier transform infrared spectroscopy(FTIR) and scanning electron microscopy(SEM). A series of experiments were carried out to investigate the degradation of Orange II by the obtained heterogeneous catalysts in the presence of H2O2. The experimental result indicated that the synthetic materials had a high catalytic activity and good reusability.
