Synthesis And Properties Study Of Bismuth Molybdate-Based Nanomaterials

In recent years,the rapid growth of global population and rapid development of industrialization have caused the serious environmental pollution problems,especially water pollution,which not only threatens the ecological balance of the natural environment,but also hinders the sustainable development of society.Therefore,it is urgent to seek an efficient and sustainable water purification technology to control water pollution.Semiconductor photocatalytic technology has the advantages of green,efficient,economic and environmentally friendly,and has a broad application prospect in the field of water pollution control.Bi₂MoO₆,as a widely used semiconductor material,has attracted attention due to its suitable band structure and remarkable photoelectric properties,especially its unique Aurivillius layered structure and its ability to be excited by visible light,which has aroused the interest of many researchers.However,the mono-component Bi₂MoO₆ still has defects such as low visible light utilization rate and poor separation efficiency of photogenerated carriers,which is not conducive to improve the photocatalytic activity of Bi₂MoO₆.The purpose of this paper is to improve the performance of Bi₂MoO₆-based nanomaterials.A variety of Bi₂MoO₆-based composite materials were successfully synthesized by electrospinning technology combined with other preparation methods,and explored their photocatalytic properties.The following are the main research contents of this paper:1.A novel Bi₂MoO₆/N-doped carbon（Bi₂MoO₆/N-C）nanofiber flexible membrane photocatalyst was successfully synthesized by combining electrospinning with solvothermal and calcination.The introduction of N-doped carbon nanofibers can not only provide a flexible carbon skeleton,but also enable photocatalysts to utilize sunlight more effectively and accelerate the transfer of photogenerated carriers.The phase structure,elemental composition and microstructure of the flexible membrane material were characterized by XRD,Raman,XPS,TEM and other test techniques.In the photocatalytic experiment,the degradation efficiency of tetracycline by Bi₂MoO₆/N-C nanofiber flexible membrane is up to 97%,which proves that the flexible membrane has excellent photocatalytic activity and can degrade tetracycline efficiently.Then the experiment of cultivating Vigna radiata further proves that the flexible membrane can effectively remove the biological toxicity of tetracycline and promote the normal growth of Vigna radiata.2.Copper phthalocyanine（Cu Pc）sensitized Bi₂MoO₆ nanofibers（Cu Pc/Bi₂MoO₆）were synthesized by electrospinning combined with a solvothermal method,and silver nanoparticles were loaded on the surface of Cu Pc/Bi₂MoO₆ by an in-situ deposition method.The Z-scheme heterojunction（Ag-Cu Pc/Bi₂MoO₆）of Cu Pc/Bi₂MoO₆nanofibers modified with silver nanoparticles was obtained.Compared with Bi₂MoO₆ and Cu Pc/Bi₂MoO₆,the photocatalytic degradation efficiency of tetracycline by Ag-Cu Pc/Bi₂MoO₆ was significantly improved.This is mainly attributed to the sensitization effect of Cu Pc,the surface plasmon resonance（SPR）effect of Ag and the construction of Z-scheme mechanism.The synergistic effect of these factors significantly reduces the recombination rate of photoelectron-hole pair,and thus improves the photocatalytic activity of Ag-Cu Pc/Bi₂MoO₆.Meanwhile,the experiment of cultivating Vigna radiata further proved that this catalyst can effectively remove the biological toxicity of tetracycline.3.Bi₂MoO₆/Ni₃V₂O₈ nanofiber heterojunction photocatalyst was prepared by electrospinning combined with solvothermal process.The phase,morphology and elemental composition of the photocatalyst were characterized by XRD,TEM,XPS and other test techniques,which proved the successful construction of the heterojunction.The synergistic effect of Bi₂MoO₆ and Ni₃V₂O₈ reduces the recombination rate of photoelectron-hole pairs,which enhances the photocatalytic degradation of tetracycline over Bi₂MoO₆/Ni₃V₂O₈ under simulated sunlight.Bi₂MoO₆/Ni₃V₂O₈ has a stable structure and morphology,and can be recycled.In addition,the growth condition of Vigna radiata also proved that this catalyst can effectively remove the biological toxicity of tetracycline.