Liu Hongxia, Mei Hui, Li Shiping, Pan Longkai, Jin Zhipeng, Zhu Gangqiang, Cheng Laifei, Zhang Litong
Science and Technology on Thermostructural Composite Materials Laboratory, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China.
Science and Technology on Thermostructural Composite Materials Laboratory, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China.
J Colloid Interface Sci. 2022 Feb;607(Pt 1):242-252. doi: 10.1016/j.jcis.2021.08.126. Epub 2021 Aug 27.
Bismuth titanate (BiTiO) with unique sillenite structure has been shown to be an excellent photocatalyst for environmental remediation. However, the narrow light-responsive range and rapid recombination of photoinduced electrons-holes limit the photocatalytic performance of BiTiO. To overcome the limitations, a practical and feasibleway is to fabricate heterojunctions by combining BiTiO with suitable photocatalysts. Here, using a facile chemical precipitation method, a novel and hierarchical core-shell structure of n-BiTiO@p-BiOI (BTO@BiOI) heterojunction was rationally designed and synthesized by loading BiOI nanosheets on BTO nanofibers. The constructed BTO@BiOI composites exhibited significant charge transfer ability due to the synergistic effects of the built-in electric field between BTO and BiOI as well as close interfacial contacts. In addition, the narrow bandgapcharacteristics of the BiOI led to wide light absorption ranges. Therefore, the BTO@BiOI heterojunction exhibited an improved photocatalytic performance under visible light irradiation. The NO removal efficiency of optimal BTO@BiOI was 45.7%, which was significantly higher compared tothat of pure BTO (3.6%) or BiOI (23.1%). Moreover, the cycling experiment revealed that BTO@BiOI composite has a good stability and reusability. The possible mechanism of photocatalytic NO oxidation over BTO@BiOI was investigated in detail.
具有独特硅铈矿结构的钛酸铋（BiTiO）已被证明是一种用于环境修复的优异光催化剂。然而，其窄的光响应范围以及光生电子 - 空穴的快速复合限制了BiTiO的光催化性能。为了克服这些限制，一种切实可行的方法是通过将BiTiO与合适的光催化剂结合来制备异质结。在此，采用简便的化学沉淀法，通过在BTO纳米纤维上负载BiOI纳米片，合理设计并合成了一种新型的分级核壳结构的n - BiTiO@p - BiOI（BTO@BiOI）异质结。由于BTO和BiOI之间的内建电场以及紧密的界面接触的协同效应，构建的BTO@BiOI复合材料表现出显著的电荷转移能力。此外，BiOI的窄带隙特性导致其具有宽的光吸收范围。因此，BTO@BiOI异质结在可见光照射下表现出改善的光催化性能。最佳的BTO@BiOI对NO的去除效率为45.7%，与纯BTO（3.6%）或BiOI（23.1%）相比显著更高。此外，循环实验表明BTO@BiOI复合材料具有良好的稳定性和可重复使用性。详细研究了BTO@BiOI上光催化NO氧化的可能机理。
