Fazli Arezou, Zakeri Fatemeh, Khataee Alireza, Orooji Yasin
Université Clermont Auvergne, CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, F-63000, Clermont-Ferrand, France.
Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471, Tabriz, Iran.
Commun Chem. 2022 Aug 10;5(1):95. doi: 10.1038/s42004-022-00707-2.
Piezoelectric fields can decrease the recombination rate of photogenerated electrons and holes in semiconductors and therewith increase their photocatalytic activities. Here, a BaTiO/WS composite is synthesized and characterized, which combines piezoelectric BaTiO nanofibers and WS nanosheets. The piezo-photocatalytic effect of the composite on the persulfate activation is studied by monitoring Ofloxacin (OFL) degradation efficiency. Under mechanical forces, LED lamp irradiation, and the addition of 10 mM persulfate, the OFL degradation efficiency reaches ~90% within 75 min, which is higher than efficiencies obtained for individual BaTiO, WS, or TiO, widely used photocatalysts in the field of water treatment. The boosted degradation efficiency can be ascribed to the promotion of charge carrier separation, resulting from the synergetic effect of the heterostructure and the piezoelectric field induced by the vibration. Moreover, the prepared composite displays good stability over five successive cycles of the degradation process. GC-MS analysis is used to survey the degradation pathway of OFL during the degradation process. Our results offer insight into strategies for preparing highly effective piezo-photocatalysts in the field of water purification.
压电场可以降低半导体中光生电子和空穴的复合率，从而提高其光催化活性。在此，合成并表征了一种BaTiO/WS复合材料，它结合了压电BaTiO纳米纤维和WS纳米片。通过监测氧氟沙星（OFL）的降解效率，研究了该复合材料对过硫酸盐活化的压电光催化效应。在机械力、LED灯照射以及添加10 mM过硫酸盐的条件下，OFL在75分钟内的降解效率达到约90%，高于单独的BaTiO、WS或TiO（水处理领域广泛使用的光催化剂）所获得的效率。降解效率的提高可归因于异质结构和振动诱导的压电场的协同效应促进了电荷载流子的分离。此外，所制备的复合材料在五个连续的降解过程循环中表现出良好的稳定性。采用GC-MS分析来研究降解过程中OFL的降解途径。我们的结果为水净化领域制备高效压电光催化剂的策略提供了见解。
