Preparation Of Bismuth Molybdate-based Composite Photocatalyst And Its Degradation Performance Of Phenol

In recent years,with the rapid development of society and economy,environmental pollution and energy shortage have become increasingly serious.Photocatalytic materials can convert renewable solar energy into chemical energy required by humans,thereby achieving the preparation of clean energy and the degradation of pollutants.Therefore,finding an efficient and clean photocatalyst system has become an important means to solve the above problems.Although related research has made great progress in recent years,the efficiency of semiconductor photocatalysts has always been a key factor,restricting the development of this technology.Bi₂Mo O₆has attracted great interest from researchers due to its special perovskite structure.Bi₂Mo O₆has a forbidden band width of about 2.5-2.8 e V.It is a commonly used catalyst for the degradation of organic matter in water.It has the advantages of non-toxicity,good thermal stability,large natural reserves,and environmental friendliness.However,there are also shortcomings,such as weak response to visible light,low photocarrier mobility and easy recombination.Therefore,exploring effective methods to enhance the performance of Bi₂Mo O₆photocatalytic degradation of phenol under visible light is necessary for the treatment of phenol-containing wastewater.Based on this,this paper mainly takes Bi₂Mo O₆as the research object,and obtains a variety of bismuth molybdate-based composite materials,through different modification processes in order to improve the photocatalytic performance of the bismuth molybdate material and discuss its catalytic degradation activity for phenol in wastewater.The enhanced mechanism provides a reference for the development of new processes for the deep degradation of phenol in wastewater.The specific research contents are as follows:A new catalyst Fe?III?/BMO-SOVs was obtained by grafting Fe?III?clusters onto the surface of the surface of Bi₂Mo O₆after calcination using the dipping method.After the successful grafting of Fe?III?clusters,the coordination of surface oxygen defects and interfacial charge transfer?IFCT?effects promotes the separation and migration of photo-generated carriers and improves the photocatalytic efficiency.Studies have shown that the efficiency of photocatalytic degradation of phenol by 15%Fe?III?/BMO-SOVs is the best,and the removal rate of phenol in 3 h reaches 93.4%,which is about 80 times that of Bi₂Mo O₆.A direct Z-type Bi₂O₃/Bi₂Mo O₆heterojunction was prepared by strong alkaline etching-in-situ growth method.Among them,the migration mechanism of Z-type photo-generated carriers inhibits the recombination of photo-generated carriers,improves the quantum efficiency,and finally enhances the photocatalytic performance of the catalyst.The results showed that the rate constant of photocatalytic degradation of phenol in 3 h was76 times that of Bi₂Mo O₆.A simple solvothermal-roasting method was used to successfully prepare a Bi₂Mo O₆@Bi₂Mo O_6-xcore-shell structure with surface oxygen defects,and a phenol solution containing Cr?VI?was used as a probe to simulate industrial phenol-containing wastewater.To study its photocatalytic performance,and to explore the effects of two factors,calcination temperature and calcination time,on the catalyst performance,the mechanism was finally discussed.