The Preparation,Modification And Photocatalytic Performance Of ?BiO?₂CO₃ Photocatalyst

With the development of the global industrialization,the problem of environmental pollution has gradually emerged,and the prevention and control of environmental pollution is imminent.Photocatalysis technology has attracted widespread attention because of its advantages of effectively removing pollutants from sewage,energy saving,environmental protection and no two time pollution.?BiO?₂CO₃ is a kind of Aurivillius type oxide,which is a layered structure consisting of the[BiO]₂²⁺layer and the CO₃^2-layer alternately.At the same time,as a new semiconductor catalytic material,because of its unique electronic structure,good adsorption properties and photocatalytic redox properties,it has great potential in the degradation of pollutants,and has important research value.In this paper,a?BiO?₂CO₃photocatalyst was synthesized by solvothermal method,and the synthesized?BiO?₂CO₃ was modified and the photocatalytic activity of?BiO?₂CO₃ in visible light was improved.The main contents of this paper are as follows:?1?Bi?NO₃?₃ 5H₂O and Na₂CO₃ were selected as raw materials for preparing?BiO?₂CO₃,and?BiO?₂CO₃ was prepared by changing solvent,reaction time and reaction temperature.And a series of methods such as XRD,SEM and DRS were used to characterize the prepared?BiO?₂CO₃.The results show that with the increase of reaction time and reaction temperature,the sheet structure of?BiO?₂CO₃ is more and more obvious,the thickness of around 3-5?m;through the optical performance test proved that it has good photocatalytic properties,the optimal preparation condition of ethylene glycol as solvent,the reaction temperature is 60?.The reaction time is 2h,the photocatalytic degradation of organic dyes in180 min of degradation rate can reach 95.34%.?2?precipitation is used to precipitate AgBr on the surface of?BiO?₂CO₃,and partial AgBr is photodissociated to Ag by optical radiation.Ag-AgBr nanoparticle is generated on the surface of?BiO?₂CO₃,so that Ag-AgBr/?BiO?₂CO₃ with visible light response is prepared.The composite catalysts were characterized by a series of methods such as XRD,SEM,DRS and so on.The effect of the deposition time on the properties of the composite catalyst Ag-AgBr/?BiO?₂CO₃ was investigated.The results show that the supported Ag-AgBr nanoparticles can effectively improve the photocatalytic activity of?BiO?₂CO₃ and improve the photocatalytic efficiency.The composite photocatalyst Ag-AgBr/?BiO?₂CO₃ was prepared for an hour of light deposition.The photocatalytic effect is the best,and the degradation rate of organic dyes can be up to 94%for 30 min.?3?Ultrathin nano-chip?BiO?₂CO₃ photocatalyst was prepared by solvent heat method.The influence of CTAB dosage on the morphology and photocatalytic activity of the photocatalyst was investigated.A series of methods such as XRD,SEM and DRS were used to systematically analyze the activity,structure and morphology of the catalyst.The results show that the doping of Br changes the morphology of the original?BiO?₂CO₃ to change the thickness of?BiO?₂CO₃ and improve its photocatalytic activity.The quality of CTAB and?BiO?₂CO₃ is 1:2,and the photocatalytic activity of the sample is the best.After 90min of illumination,the degradation rate was 98.4%.?4?a compound catalyst BN/?BiO?₂CO₃ was prepared by solvent heat method.The effects of the amount of BN on the morphology and photocatalytic activity of the composite catalyst were studied.A series of detection techniques such as XRD,SEM and DRS were used to systematically analyze the activity,structure and morphology of the catalyst.The results show that the composite catalyst BN/?BiO?₂CO₃ adsorption performance and high visible light photocatalytic activity,when the adsorption reached equilibrium after 90 min after simulated visible light irradiation,the degradation rate ofrhodamine B reached more than96%,high activity attributed to the synergistic effect of adsorption and photocatalysis.