Preparation And Photocatalytic Activity Of Core-Shell SiO₂@TiO₂,Fe₂O₃@TiO₂ Microspheres

Many countries around the world has witnessed sever water resources pollution and soil contamination as a result of industrial wastewater containing organic pollutants.However,due to its low utilization rate in visible light conditions and catalyst recovery difficult.In this study,a series of experiments were designed to investigate the photocatalytic degradation of organic pollutants by nuclear shell structure X@Ti O₂ composite microspheres,this topic main research content is as follows:The good dispersive Si O₂ microspheres were prepared by the PS template synthesis method,and the characterization test was performed.Throughing sol-gel method and mild hydrothermal method to discuss the best core-shell structures of Si O₂@Ti O₂ microspheres preparation technology,and the Si O₂@Ti O₂ microspheres of high dispersing ability were prepared,the photocatalytic performance was discussed by means of thermal stability X-ray diffraction gap and pore diameter uv-visible diffuse reflectance spectroscopy.In addition,in order to prepare the photocatalyst which is easy to be recycled,a magnetic shell structure Fe₂O₃@Ti O₂ ellipsoid catalyst was prepared by photocatalytic contrast experiment.It can be clearly seen from the morphology analysis that about 50 nm Ti O₂ shell is loaded on the 400 nm Si O₂ core.Through the UV-visible diffuse reflectance spectrum analysis,the minimum value of the bandgap width after doping of the catalyst was reduced to about 2.82e V,and the optical response range extended to the visible light region.At the same time,we found that 3Fe-N STNS can decompose 99.5%of TA into CO₂ and H₂O within 80min under visible light irradiation,compared with Ti O₂ nanoparticles,pure STNS and a series of different Fe-doped x Fe-NSTNS catalysts.The photocatalytic performance of 3Fe-N STNS is the highest;even after the catalyst is recycled 4times,it still has a degradation rate of more than 80%.This topic research significance lies in the fact that using simple sol-gel method and mild hydrothermal method,Si O₂@Ti O₂ nanoparticles with large specific surface area and excellently dispersive nuclear shell structure were prepared,and great dispersibility of core-shell structure Fe-N doping of Si O₂@Ti O₂ nanospheres.The research offers a feasible insight into processing waste water containing organic matter for photocatalytic technology which can avoid the incomplete degradation of the traditional processing technology,high precise equipment and heavy investment.