Zhou Jianwei, Duo Fangfang, Wang Chubei, Chu Liangliang, Zhang Mingliang, Yan Donglei
Henan Photoelectrocatalytic Material and Micro-Nano Application Technology Academician Workstation, Xinxiang University Xinxiang Henan China
College of Chemistry and Material Engineering, Xinxiang University Xinxiang 453003 PR China.
RSC Adv. 2022 May 4;12(21):13535-13547. doi: 10.1039/d2ra02115c. eCollection 2022 Apr 28.
Herein, defect intrinsic hexagonal boron nitride (h-BN) quantum sheets (QS) and bismuth oxide (BiO) QS were prepared from bulk materials by ball milling and solvent stripping, respectively. The h-BN/BiO heterostructure was fabricated a facile self-assembly method. The structure and performance of samples were systematically characterized. As expected, the layered h-BN QS is tightly coated on the surface of BiO QS in a face-to-face stacking structure and interconnected by strong interface interactions. The introduction of h-BN QS can significantly enhance the separation efficiency of the photogenerated carriers of h-BN/BiO. The experimental results show that the photocatalytic activity of h-BN/BiO is markedly improved. The first-order reaction rate constant of the 3wt%-BN/BiO sample is 3.2 × 10 min, about 4.5 times that of BiO QS. By means of the active species capture test, it is found that the main oxidation species are holes (h), followed by hydroxyl radicals (˙OH). Based on the surface charge transfer characteristics, the photogenerated carrier transfer and separation efficiency can be improved by coupling h-BN and a BiO semiconductor to the Schottky heterojunction, and the strong interaction between heterogeneous interfaces also enhances the surface catalytic reaction efficiency, which improves dramatically the photocatalytic performance.
在此，本征缺陷六方氮化硼（h-BN）量子片（QS）和氧化铋（BiO）量子片分别通过球磨和溶剂剥离从块状材料制备而成。采用简便的自组装方法制备了h-BN/BiO异质结构。对样品的结构和性能进行了系统表征。正如预期的那样，层状h-BN量子片以面对面堆叠结构紧密包覆在BiO量子片表面，并通过强界面相互作用相互连接。h-BN量子片的引入可显著提高h-BN/BiO光生载流子的分离效率。实验结果表明，h-BN/BiO的光催化活性明显提高。3wt%-BN/BiO样品的一级反应速率常数为3.2×10⁻³ min⁻¹，约为BiO量子片的4.5倍。通过活性物种捕获试验发现，主要氧化物种为空穴（h⁺），其次是羟基自由基（˙OH）。基于表面电荷转移特性，通过将h-BN与BiO半导体耦合形成肖特基异质结，可以提高光生载流子的转移和分离效率，异质界面之间的强相互作用也提高了表面催化反应效率，从而显著提高了光催化性能。
