The highly efficient degradation and purification of organic pollutants in wastewater by photocatalysis is still challenging.In this study,a piezoelectric potential-activated interfacial electric field(IEF)was constru...The highly efficient degradation and purification of organic pollutants in wastewater by photocatalysis is still challenging.In this study,a piezoelectric potential-activated interfacial electric field(IEF)was constructed to endow BiFeO_(3)@BaTiO_(3)(BFO@BTO)heterojunction with the ability to serve as a round-the-clock photocatalyst for polluted water remediation.BFO@BTO heterojunction is composed of BiFeO_(3)nanoparticles decorated on the surface of BaTiO_(3)nanorods,which shortens the carrier migration path.More importantly,the IEF can be activated and reconstructed under ultrasonic wave irradiation,leading to a lower potential barrier and enhanced separation efficiency for photogenerated carriers.The degradation rate constant k value of BFO@BTO heterojunction reached 0.038 min^(−1),which was 1.9 and 7.0 times greater than that of piezocatalysis and photocatalysis alone,respectively.It also exhibited excellent stability in three light‒dark cycles for high concentrations(25 mg·L^(−1))of rhodamine B(RhB)and tetracycline hydrochloride(TC).This study provides a promising strategy for designing highly active photoassisted piezocatalysts for environmental energy utilization and round-the-clock catalysis.展开更多
基金supported by the National Natural Science Foundation of China(Nos.52173094 and U21A2054)the Natural Science Foundation of Guangxi Province(No.2019GXNSFFA245010)l the Scientific and Technological Plan of Guilin City(No.20220110-1).
文摘The highly efficient degradation and purification of organic pollutants in wastewater by photocatalysis is still challenging.In this study,a piezoelectric potential-activated interfacial electric field(IEF)was constructed to endow BiFeO_(3)@BaTiO_(3)(BFO@BTO)heterojunction with the ability to serve as a round-the-clock photocatalyst for polluted water remediation.BFO@BTO heterojunction is composed of BiFeO_(3)nanoparticles decorated on the surface of BaTiO_(3)nanorods,which shortens the carrier migration path.More importantly,the IEF can be activated and reconstructed under ultrasonic wave irradiation,leading to a lower potential barrier and enhanced separation efficiency for photogenerated carriers.The degradation rate constant k value of BFO@BTO heterojunction reached 0.038 min^(−1),which was 1.9 and 7.0 times greater than that of piezocatalysis and photocatalysis alone,respectively.It also exhibited excellent stability in three light‒dark cycles for high concentrations(25 mg·L^(−1))of rhodamine B(RhB)and tetracycline hydrochloride(TC).This study provides a promising strategy for designing highly active photoassisted piezocatalysts for environmental energy utilization and round-the-clock catalysis.
