YAN Shaoxuan, WANG Heyuan, JIN Song, LI Naidu
(School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384)
Abstract: Fe3O4 magnetic nanoparticles were prepared through the method of advanced ultrasound-assisted reverse co-precipitation, then hydroxyl-functionalized magnetic nanocomposite microspheres were prepared by way of seed emulsion co-polymerization utilizing Fe3O4 magnetic nanoparticles as seeds, at last the magnetic nanocomposite microsphere-supported hemin mimetic enzyme catalyst was prepared by means of binding hemins to the above-mentioned magnetic nanocomposite microspheres using cyanuric chloride as the bridging agents. The catalyst was characterized by Fourier transform infrared spectrometer (FT-IR), UV-visible (UV-Vis) spectrophotometer with the integrating sphere, transmission electron microscopy (TEM), thermo-gravimetric analysis (TGA) and vibrating sample magnetometer (VSM). The result showed that the catalyst, with an average particle size of 10~12 nm, had a smooth granularity and good dispersibility and displayed some degree of paramagnetic behavior at 300 K, with the saturation magnetization and the magnetite nanoparticles content being 21.61 emu/g and 52.50 wt% respectively. The catalyst, in the presence of ultraviolet light and H2O2, exhibited a high oxidative degradation activity for DMP in aqueous solution and still had a good effect after repeated use.
Key words: magnetic nanocomposite microspheres; hemin; ultraviolet light; hydrogen peroxide; dimethyl phthalate
Journal of Molecular Catalysis, Vol. 26, Issue 6, 2012, 560-565