Piezoelectric potential activated interfacial electric field in BiFeO 3 @BaTiO 3 heterojunction for rapid and round-the-clock photocatalytic degradation of organic pollutants

作者：Mingtong Li, Jianhua Zhou, Rui Di, Zhixiang Zhang, Xiaojiang Mu, Xiaoyang Wang, Yufei Gu, Lifen Su, Jing Liu, Chengyan Liu, Changlai Yuan, Lei Miao · 发表于：Journal of Advanced Ceramics · 年份：2024 · DOI：10.26599/jac.2024.9220996 · 被引用次数：37 · 研究领域：Water Quality Monitoring Technologies

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.