Preparation, Characterization Of One-dimensional Iron-based Composite Mental Oxide Nanostructures And Their Application In Water Purification

One dimensional iron-base metal oxide composites with spinal structure are widely applied in many fields, such as semiconductor photocatalysis, the electronics industry, drug delivery, medical clinics, sensors and magnetic materials, and have potential application value in the treatment of wastewater containing dye and heavy metal ion due to their unique physical and chemical properties.In the present work, one dimensional iron-cobalt oxalate precursor has been successfully synthesized in the system of ethylene glycol-water binary solvent. Cobalt ferrite with one dimensional nanostructure has been obtained by the decomposition of the corresponding precursor. The research results show that the hydrothermal synthesis of binary solvent is an effective means to prepare the oxalate precursor. The crystallinity and crystalline size of cobalt ferrite increase with the increasing calcination temperature. The magnetic study for the calcined products indicate that the saturation magnetization increases with the increasing calcination temperature and reaches54.93emu/g for the sample calcined at700℃. The coercive force of the calcined samples first increases, then decreases, and the maximum coercive force of the sample calcined at550℃is1689.4Oe.Accordingly, we prepared the zinc ferrite nanorods by the zinc ferricoxalate precursor nanorods, which were synthesized by the hydrothermal method with the system of EG-water binary solvent. The as-prepared zinc ferrite nanorods were built by nanoparticles. zinc ferrite nanorods possess the narrower band gap compared with bulk material and good adsorption for visible light. Therefore, the catalytic activity of the as-prepared zinc ferrite nanorods as catalyst was evaluated by the methylene blue (MB) aqueous solution as the simulated polluted water. The results show that the MB was degradated85%in6h, indicating the super catalytic activity of the as-prepared zinc ferrite nanorods than the bulk material.Base on the previous researches, porous Co Zn ferrite nanorods built by nanoparticles were obtained by the as-synthesized Co-Zn ferricoxalate precursor nanorods prepared by the above-mentioned hydrothermal thermal method. The results show that the crystallinity increased with the increasing zinc content, and the coercivity of the ferrite nanorods decreases with increasing Zn content, whereas the specific saturation magnetization initially increases and then decreases with the increase of Zn content in the same treatment condition. Maximum saturation magnetization of (Co0.5Zn0.5Fe2O4) in x=0.5reached43.0emu/g.We employed the as-prepared one dimensional cobalt ferrite nanorods as carrier because of its good magnetic property. The CoFe2O4/C composites have been prepared by hydrothermal method with the glucose as carbon source. The CoFe2O4/C composites were applied to the removal of Cr(VI) from the simulated wastewater. The influence of CoFe2O4/C composites prepared in different condition has been investigated in detail. The results show that the molar ratio of n(CoFe2O4) and n(C6Hi2O6) is1:10is the more suitable in three CoFeO4/C composites samples for the removal of Cr(VI). Adsorption process at room temperature can be described by the Langmuir isotherm adsorption model and the maximum adsorption capacity can reach206.84mg/g.