Design, Synthesis And Photocatalytic Performance Of Bismuth-based Nanomaterials

At present,human society is developing with a rapid pace,and tremendous progress have been achieved in humanities,thought,technology,and so on.However,a series of problems,such as energy depletion and environmental pollution,have also accompanied,which greatly restrain the development of natural and social society.This work takes the sustainable development as the starting point to perform the following research:?1?BiOI two-dimensional nanosheet precursors were prepared by novel electrodeposition method.BiVO₄ porous nanosheets were synthesized by using the morphology advantages of the precursors.The S source was provided by Na₂S solution and take hydrothermal reaction for the vulcanization of BiVO₄,In order to explore the optimum content of BiVO₄ converted to Bi₂S₃,we carried out a series of hydrothermal reaction time of 30 min,40 min,50 min,60 min,80 min,and find the sample with 40min treatment exhibited the highest performance,indicating that the BiVO₄/Bi₂S₃composite structure was successfully constructed.The photocurrent density is 0.358mA/cm² by photoelectrochemical test,which could be further increased to 0.822 mA/cm²by photoelectrodeposition of FeOOH,and the mechanism have also been discussed in detail.?2?Using BiOI two-dimensional nanosheets as precursors,Bi₅O₇I porous nanosheets were prepared by simple calcination method.The effects of 1,2-propanediol addition on its composition,morphology and properties were investigated.Post-modification of ZnO QDs/rGO films to investigate the effect of ZnO QDs/rGO on photoelectric properties.In order to explore the possible mechanism of photoelectrochemical reaction in Bi₅O₇I/rGO/ZnO heterostructure,the reverse Z-type system was constructed by replacing Bi₅O₇I with WO₃ in a comparative experiment,and indirectly proved that ZnO QDs/rGO films supported on Bi₅O₇I photoelectrode can successfully achieve the pure Z-type charge transfer system without reverse reaction.?3?The Bi?NO₃?₃ and NH₄VO₃ solutions were separately prepared,and the BiVO₄nanoparticle was prepared by spin coating.The structure and properties were characterized and verified.Then the element was doped(added H₈MoN₂O₄ and?NH₄?₁₀W₁₂O₄₁1 in NH₄VO₃),it is found that the doping of Mo and W elements can increase the photocurrent density of BiVO₄.We load Fe₂O₃ QDs/rGO using graphene as a solid intermediate medium to further improve its photoelectrochemical performance,and we also loading FeOOH as a cocatalyst,which finally enhanced the photocurrent density to 1.712mA/cm².This system also needs to further explore the mechanism of its performance improvement.