A composite material（Fe3O4/Coke）using coke supported Fe3O4 magnetic nanoparticles was successfully prepared via an in-situ chemicaloxidation precipitation method and characterized by SEM,XRD,Raman,and FTIR.The resul...A composite material（Fe3O4/Coke）using coke supported Fe3O4 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 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 ℃ and the best ratio of Coke/Fe3O4 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 Fe3O4,the catalytic ability of Fe3O4/Coke in the presence of H2O2 was greatly enhanced.And Fe3O4/Coke was a green and environmentalcatalyst with high catalytic activity,showing a good chemicalstability and reusability.展开更多
Ferromagnetic Fe3O4 nanoparticles were synthesized using water as the solvent through the sol-gel method, which was selected for its cost-effectiveness, simplicity, and eco-friendly nature. The synthesized nanoparticl...Ferromagnetic Fe3O4 nanoparticles were synthesized using water as the solvent through the sol-gel method, which was selected for its cost-effectiveness, simplicity, and eco-friendly nature. The synthesized nanoparticles were characterized using a variety of techniques, including Fourier Transform Infrared (FTIR) spectroscopy, X-ray powder diffraction (XRD), Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA), and Vibrating Sample Magnetometer (VSM). These characterizations confirmed the successful formation of Fe3O4 nanoparticles. The FTIR spectra identified characteristic peaks corresponding to the functional groups present, and XRD analysis, using Scherer’s equation, determined an average crystalline size of 1.2 nm for the Fe3O4 nanoparticles. TGA results demonstrated the thermal stability of the nanoparticles, SEM imaging revealed distinct honeycomb-like structures for the nanoparticles synthesized with water as the solvent, while the VSM analysis was used to determine the magnetic behavior of the nanoparticles.展开更多
基金Funded by the Specialized Research Fund for Doctoral Program of Higher Education of China(No.20114219110002)the Educational Department of Hubei Province of China(No.D20131107)the Natural Science Fundation of Hubei Provice(No.2014CFB810)
文摘A composite material（Fe3O4/Coke）using coke supported Fe3O4 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 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 ℃ and the best ratio of Coke/Fe3O4 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 Fe3O4,the catalytic ability of Fe3O4/Coke in the presence of H2O2 was greatly enhanced.And Fe3O4/Coke was a green and environmentalcatalyst with high catalytic activity,showing a good chemicalstability and reusability.
文摘Ferromagnetic Fe3O4 nanoparticles were synthesized using water as the solvent through the sol-gel method, which was selected for its cost-effectiveness, simplicity, and eco-friendly nature. The synthesized nanoparticles were characterized using a variety of techniques, including Fourier Transform Infrared (FTIR) spectroscopy, X-ray powder diffraction (XRD), Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA), and Vibrating Sample Magnetometer (VSM). These characterizations confirmed the successful formation of Fe3O4 nanoparticles. The FTIR spectra identified characteristic peaks corresponding to the functional groups present, and XRD analysis, using Scherer’s equation, determined an average crystalline size of 1.2 nm for the Fe3O4 nanoparticles. TGA results demonstrated the thermal stability of the nanoparticles, SEM imaging revealed distinct honeycomb-like structures for the nanoparticles synthesized with water as the solvent, while the VSM analysis was used to determine the magnetic behavior of the nanoparticles.
