Preparation And Visible Light Photocatalytic Performance Of Bi₂MoO₆ Heterostructure Photocatalysts

Semiconductor photocatalytic technology is a green technology with important application prospect in energy and environment.Bismuth molybdate?Bi₂MoO₆?has attracted extensive attention,because of its high photocatalytic activity and excellent stability.However,the practical application of the pure phase Bi₂MoO₆ is limited by its poor quantum yield and visible light absorption rate.Therefore,to further improve the photocatalytic performance and stability of Bi₂MoO₆,it was modified through composite with other semiconductors in the article.Rhodamine B?Rh B?was selected as a target pollutant to evaluate the photocatalytic performance and stability of phtotcatalysts,and its proposed photocatalytic mechanism was explored.BiOBr/Bi₂MoO₆ composite photocatalyst was synthesized by a two-step solvothermal method.The crystal structure,morphology and optical property of samples were characterized by XRD,SEM,TEM,XPS,PL,UV-vis DRS.The result shows that BiOBr/Bi₂MoO₆ was synthesized successfully with high photocatalytic activity under visible light irradiation,and the doping of BiOBr enhanced visible light absorption.The optimal composite with 20% BiOBr content showed the highest photocatalytic activity under visible light irradiation.By the detection of active species,demonstrated that h⁺ and ·O₂^- play the crucial roles in photodegradation of pollutants.Therefore,the BiOBr compounding with Bi₂MoO₆ is an effective way for the improvement of photocatalytic performance and stability.On basis of Bi₂MoO₆,the Bi₂MoO₆-MIL-100?Fe?composite was synthesized using a facile solvothermal method by the introduction of MIL-100?Fe?.The crystal structure,morphology specific surface area and the leaching of metal iron of samples were characterized by XRD,SEM,TEM,BET,XPS,PL,UV-vis DRS and ICP-AES.The result shows that the composite photocatalyst was well-crystallized and excellent optical properties.The results of photocatalytic degradation of Rh B shows that Bi₂MoO₆-MIL-100?Fe?exhibited the best photocatalytic efficiency when the addition of MIL-100?Fe?,its reaction kinetics constant?0.02174 min-1?is 2.46 times than pure Bi₂MoO₆.Therefore,the MIL-100?Fe?play a key role for improvement of photocatalytic activity and stability in Bi₂MoO₆-MIL-100?Fe?composite.PANI/Bi₂MoO₆ photocatalyst was synthesized via ?in situ‘ oxidative polymerization method,and characterized by XRD,SEM,TEM,BET,PL,UV-vis DRS and AC Impedance.The characterization on results showed that,the surface of Bi₂MoO₆ is closely coated by PANI,and the PANI/Bi₂MoO₆ photocatalyst was synthesized successfully with enhanced visible light absorption.When the addition content of aniline is 10 ?L,the composites showed the highest photocatalytic activity,the photodegradation rate is 90.36% over RhB.By the detection of active species,demonstrated that h⁺ and ·O₂^- played the crucial roles in photodegradation of pollutants.Therefore,PANI compound are of great significance to strengthening the photocatalytic performance and stability of Bi₂MoO₆.