Synthesis,Modification And Photocatalytic Performance Research Of Bismuth Vanadate Heterojunction

Visible light semiconductor photocatalysis technology has been considered as a new type of green catalysis technology because it not only has the advantages of mild reaction conditions,non-toxicity,environmentally friendly but also can directly use sunlight as an energy source.Visible light semiconductor photocatalysis technology has widely used in the degradation of organic pollutants in water,especially in the field of degradation of antibiotics and dyes.In this paper,Bi VO₄ with different morphologies was prepared by simple hydrothermal method,and?-Ag₂Mo O₄/Bi VO₄ and Bi VO₄/Bi OI heterojunction photocatalysts were further synthesized by self-assembly method.The XRD,XPS,SEM,EDX,TEM,HR-TEM and BET measurements revealed the component and morphology properties and the UV-Vis DRS,PL,PT and EIS were used to investigate the optical properties.Tetracycline hydrochloride?TC?and Rhodamine B?Rh B?were used as target pollutants respectively,and their photocatalytic activities were explored under simulated sunlight.The degradation mechanism was studied through experiments and characterization results.The specific research contents are as follows:1.Firstly,dumbbell-like Bi VO₄ was prepared by solvothermal method using Bi?NO₃?₃·5H₂O and NH₄VO₃ as raw materials.Then,Ag NO₃ and Na₂Mo O₄·2H₂O were added to prepare different mass percentages of?-Ag₂Mo O₄/Bi VO₄ heterojunction catalyst by simple in-situ precipitation method.The degradation of TC and Rh B under visible-light irradiation showed that the?-Ag₂Mo O₄/Bi VO₄ complex has higher photocatalytic activity.Furthermore,a small amount of Ag nanoparticles were produced during the photocatalytic degradation process facilitates the construction of Z-scheme system,thereby maintaining a high catalytic activity of the catalyst.Finally,the potential Z-scheme photocatalytic mechanism also was deeply discussed based on the trapping experiments and ESR characterization results.2.The sphere-like Bi VO₄ was prepared by solvothermal method using Bi?NO₃?₃·5H₂O and NH₄VO₃ as raw materials.The synthesized Bi VO₄ was dispersed in an ethylene glycol solution containing Bi?NO₃?₃·5H₂O,finally,the KI solution was added.A series of fower-like Bi VO₄/Bi OI core/shell composites were synthesized by depositing Bi OI irregular nanosheets on the surface of sphere-like Bi VO₄ particles via an in-situ precipitation method.This special morphology makes it have more active sites,which is beneficial to the improvement of photocatalytic activity.The research of degradation of TC under visible-light irradiation exhibited that the Bi VO₄/Bi OI composites had better photocatalytic activity and superior adsorption capability.Finally,the potential photocatalytic mechanism of enhancing photocatalytic activity was deeply explored.