Preparation And Photocatalytic Properties Of TiO₂/MnFe₂O₄ Nano-fibers

The rapid development of industry and the over-exploitation of resources have caused many problems such as environmental and energy to become increasingly serious.Among them,the pollution caused by industrial wastewater to water resources is particularly serious.Governments of various countries have also paid more attention to the treatment of environmental pollution,focusing on the research and development of environmental purification and environmental treatment technologies.At present,it is difficult for the wastewater purified by traditional treatment methods to meet the national discharge standards.Therefore,finding an efficient and new wastewater treatment method has become a hot topic for scholars today.At present,the photocatalyst with titanium dioxide(TiO₂)as the substrate has been widely used in the field of photocatalytic wastewater treatment.Because of the high recombination rate of photogenerated electrons and holes in traditional photocatalysts,and the narrow response range to sunlight,this paper conducts related research from the following aspects.(1)Prepare a precursor solution by dispersing tetrabutyl titanate(TBT)into an ethanol solution of polyvinylpyrrolidone(PVP).The ultra-long continuous TiO₂nanofibers are prepared by electrospinning technology.The effects of different additions of PVP and TBT on TiO₂nanofibers were investigated,and the best preparation conditions for TiO₂nanofibers were obtained using scanning electron microscopy(SEM),X-ray diffraction(XRD),and Raman spectroscopy(Raman).,And use methylene blue(MB)as a pollutant model to verify the optimal preparation conditions and photocatalytic performance of TiO₂nanofibers through photocatalytic degradation.The analysis of the results showed that the performance of TiO₂nanofibers was the best when the addition of PVP was 9 wt%ethanol solution and the addition of TBT was 9m L.The photocatalytic degradation efficiency of MB can reach 82.1%,and after 4cycles of degradation experiments,the photocatalytic degradation rate can still maintain78.14%.(2)To extend the light response range of TiO₂nanofibers,manganese ferrite(MnFe₂O₄)was introduced,and the TiO₂/MnFe₂O₄composite material was successfully prepared by the water bath method.The prepared composite materials were characterized and analyzed by analytical methods such as Raman spectroscopy(Raman),X-ray diffraction(XRD),ultraviolet-visible diffuse reflectance(UV-vis),and photoluminescence spectroscopy(PL).By degrading MB,the photocatalytic activity of TiO₂/MnFe₂O₄composite material under visible light was explored.The analysis results show that the introduction of MnFe₂O₄extends the visible light response range of the composite material to 571 nm,and reduces the bandgap to 2.16 e V.After being degraded for 120 min under visible light conditions,the light of the TiO₂/MnFe₂O₄(1:1)composite material The catalytic degradation efficiency can reach 85.5%.In addition,the TiO₂/MnFe₂O₄composite magnetic photocatalyst can be easily and quickly separated from the solution under the action of an external magnetic field due to its magnetism.Therefore,the excellent photocatalytic activity,unique structure,and easy magnetic recovery of the composite material make it a candidate for wastewater treatment applications,and at the same time expand the range of alternative photocatalytic materials.