Controlled Synthesis Of Micro-nano Molybdenum Trioxide, Bismuth Tungstate And Bismuth Tungstate/bismuth Oxychloride Heterojunction Materials And Their Photocatalytic Propertie

Due to their special physical and chemical properties,micro-nano materials have a wide range of applications in catalysis,photoelectric energy storage,and gas sensors.Therefore,the preparation of novel metal compound micro/nano materials and the study of their morphology control,size dimension and growth mechanism have become a hot spot in this field.In this paper,novel micro nano materials were prepared by taking Mo O₃,Bi₂WO₆ and Bi₂WO₆/Bi OCl heterostructures as the research objects,the influencing factors and possible formation mechanism were explored,and the photocatalytic properties of the samples were tested by photocatalytic degradation of methylene blue or rhodamine B.The main work contents are as follows:（1）Through the mixed reaction of ammonium paramolybdate and hydrochloric acid,using SDS as the surfactant,the hexagonal prism-shaped Mo O₃ was prepared by a simple hydrothermal method,and the Mo O₃ nanobelt could be prepared by changing the hydrothermal time.According to the research results of influencing factors,the formation process is discussed.The photocatalytic performance of the sample was tested.It has an excellent photocatalytic degradation effect on the methylene blue aqueous solution under visible light,and the degradation rate is 90.6%within 120minutes.（2）Using Bi（NO₃）₃ as the source of bismuth,Na₂WO₄ as the source of tungsten,and ethylene glycol as the solvent,the knob-shaped Bi₂WO₆ was prepared by hydrothermal treatment at 150℃for 8 hours.It was obtained by scanning electron microscope（SEM）,energy spectrum（EDS）,and X-ray.Characterization methods such as diffraction（XRD）characterize the morphology,surface chemical composition and crystal structure of bismuth tungstate semiconductors.Several influencing factors and photocatalytic performance of bismuth tungstate morphology were explored,and the possible degradation mechanism was speculated.（3）A gyroscopic Bi₂WO₆/Bi OCl heterostructure was synthesized by loading Bi OCl particles on the surface of the prepared bismuth tungstate.And adjusted the W/Cl ratio and found that the Bi OCl particles loaded on Bi₂WO₆ became larger.Then the morphology,crystal structure,chemical composition and optical properties of Bi₂WO₆/Bi OCl heterostructure were characterized by SEM,EDS,XRD,XPS,UV-VIS DRS and other characterization methods.At the same time,the prepared photocatalyst exhibits excellent photocatalytic performance in degradation of Rh B aqueous solution under visible light irradiation,and WCl-0.75 has the highest photocatalytic activity.In addition,the photocatalytic activity of WCl-0.25,WCl-0.5,and WCl-1 were also higher than that of pure bismuth tungstate.Finally,the possible mechanism of the sample degradation of Rh B aqueous solution was speculated.Mo O₃,Bi₂WO₆ and Bi₂WO₆/Bi OCl micro-nano materials have been successfully prepared by hydrothermal method,which have good photocatalytic performance and have their application potential in the fields of photocatalyst and wastewater treatment.