Controllable Preparation Of Zinc Oxide, Tin-doped Zinc Oxide And Bismuth Iodide/bismuth Tungstate Nanomaterials And Their Photocatalytic Properties

Inorganic nanomaterials were widely used in catalysis,sensing,photoelectricity and other fields due to their unique physical and chemical properties.Controlling the morphology,size,and dimensions and studying their growth mechanisms of novel nanomaterials had become hotspots.In this paper,Zn O,Sn-doped Zn O and BiOI/Bi₂WO₆inorganic nanomaterials were used as research objects to prepare the novel nanomaterials.The possible formation mechanism was discussed.Meantime,to degrade the Rh B aqueous solution and TC aqueous solution evaluated their photocatalytic activity.?1?The hierarchical flower-like Zn O nanostructures were successfully obtained by hydrothermal method at 120°C for 7 h.By cotrolling the amount of urea and glycerol,the morphology was transformed.With the coexistence of urea and glycerol,the hierarchical flower-like Zn O nanostructures could be obtained.Based on a series of time experiments,a possible formation mechanism was proposed,which could be described as nucleation,growth and self-assembly of nanosheets.The photocatalytic performance was evaluated,and the photocatalytic degradation effect of Rh B aqueous solution was excellent under UV-light irradiation.The degradation rate was 91%within 125 min.?2?The flower-like Sn-doped Zn O?FLSn-Zn O?nanostructures were synthesized by one-pot method at 180°C.The prepared samples were assembled by regular shaped nanosheets and nanoparticles.The dosage of citric acid affected the structure.Meantime,based on a series of experiments controlling the hydrothermal time,a possible formation mechanism was proposed.The characterization results of UV-vis reflection,photoluminescence and photocurrent response showed that the optical properties of FLSn-Zn O were superior than Zn O.Under UV-light irradiation,the photocatalytic activity of FLSn-Zn O nanostructures were higher than pure Zn O by degrading Rh B and TC aqueous solution.?3?The erythrocyte-like Bi₂WO₆ was successfully synthesized by hydrothermal treatment at 180°C for 12 h,then Bi₂WO₆ nanaostructures were used as template to composite BiOI on the surface,and finally the BiOI/Bi₂WO₆ heterostructures were synthesized.Meantime,the ratio of I/W was also adjusted to synthesize a series of samples.The crystal structure,morphology,chemical composition and optical properties of BiOI/Bi₂WO₆ heterostructures were characterized by XRD,SEM,EDX,DRS and XPS.In addition,under visible light irradiation,the obtained samples exhibited excellent photocatalytic activity in the degrading the TC aqueous solution.Especially,BWI-0.5 exhibited the highest photocatalytic activity,and the TC aqueous solution was almost completely degraded in 70 minutes.The photocatalytic activities of BWI-0.75,BWI-1 and BWI-0.25 were higher than BWI-0.Inorganic nanomaterials such as Zn O,Sn-doped Zn O,and BiOI/Bi₂WO₆nanomaterials were successfully synthesized by hydrothermal method,and their photocatalytic performance was excellent,which offered theoretical direction on application research.