Preparation And Application Of The Flower-like Magnetic Materials/TiO₂Compound Photocatalyst

TiO₂is a well-known catalyst with the superiority of catalytic activity,non-toxic,chemical stability and strong oxidizability,and has a vast range of application for wastewater treatment.However,the use of TiO₂is still limited mainly due to difficultseparation of TiO₂particles from treated water and the low reused rate.In order to solvethe problem,TiO₂nanoparticles can be coated on the carriers.Recently years,the carriermaterials of Nano-TiO₂mainly used by ceramic, hollow glass beads and stainlesssteel,while the ceramic and the hollow glass beads are easy to be broken and the specificdensity of the stainless steel is bigger than the major,all of these have limited the scopeof application for these materials and the development in industrialization.In this study,different novel flower-like magnetic carriers with high specific surface area have beenprepared,then use them to load the TiO₂,expect to obtain composite photocatalyst withhigher catalytic activity and magnetic recycling property.The specific research methodsand contents are as follows:（1）EDTA was used as the complexing agent, magnetic powder of Co-micronelemental with flower-like structure was prepared by hydrothermal method, of which thesaturation magnetization （Ms） is274emu/g and the coercivity is121Oe.Then flower-likeFe3O4magnetic powder with the saturation magnetization（51.4emu/g）and the coercivity（121.3Oe）was prepared by hydrothermal method, in which the phosphate wasused as the directing agent for the morphology form.And the FeCo magnetic powderwith flower-like structure with the saturation magnetization（236.6emu/g）and thecoercivity （5.5Oe） was prepared by using the sodium acetate as the complexingagent.All of these have been explored the impact of preparation process to themorphology of the final product.（2）The micro-morphology, crystal structure and the magnetic property werecharacterized by Scanning electronic microscope （SEM）, X-ray diffraction（XRD）andVibrating Sample Magnetometer（VSM）, respectively.Results showed that:TiO₂has beensuccessfully loaded on the surface of the flower-like magnetic powder.Then usingrhodamine B as the target pollutants, respectively explored the effect of the load factor tothe photocatalytic properties and the magnetic recycling properties.Results showedthat:flower-like Co/TiO₂composite photocatalyst has the best degradation rate.When theload mass ratio of Co and TiO₂is1:2, the degradation rate of the composite particles torhodamine B can be reached85.1%,Compared to the pure TiO₂,its degradation rateincreased by2.6%.