Li Xiaolin, Qu Yanan, Xu Junjie, Liang Junhui, Chen Huayu, Chen Da, Bai Liqun
College of Chemistry and Materials Engineering, Zhejiang Agriculture and Forestry University, Hangzhou, Zhejiang Province 311300, China.
College of Materials and Chemistry, China Jiliang University, Hangzhou, Zhejiang 310018, China.
ACS Omega. 2023 Jul 21;8(30):26882-26894. doi: 10.1021/acsomega.3c01591. eCollection 2023 Aug 1.
In this work, a novel two-dimensional/two-dimensional (2D/2D) hybrid photocatalyst consisting of BiWO (BWO) nanosheets and cotton fibers biochar (CFB) nanosheets was successfully prepared via a facile hydrothermal process. The as-prepared photocatalysts were characterized by a variety of techniques, including X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-vis diffuse reflectance spectroscopy. It was revealed that amorphous CFB nanosheets were uniformly immobilized on the surface of crystalline BWO nanosheets, and an intimate contact between CFB and BWO was constructed. The photocatalytic activities of the prepared BWO and CFB-BWO photocatalysts were evaluated by photocatalytic degradation of rhodamine B (RhB) and tetracycline hydrochloride (TC-HCl) in aqueous solutions under visible-light irradiation. Compared to the pristine BWO, the CFB-BWO composite photocatalysts exhibited significant enhancement in photocatalytic activities. Among all CFB-BWO samples, the 9CFB-BWO sample with the CFB mass ratio of 9% exhibited optimal photocatalytic activities for RhB or TC-HCl degradation, which was ca. 1.8 times or 2.4 times that of the pristine BWO, respectively. The improvement in photocatalytic activities of the CFB-BWO photocatalysts could be ascribed to the enhanced migration and separation of photogenerated charge carriers due to the formation of a 2D/2D interfacial heterostructure between CFB and BWO. Meanwhile, the possible mechanism of CFB-BWO for enhanced photocatalytic performance was also discussed. This work may provide a new approach to designing and developing novel BWO-based photocatalysts for the highly efficient removal of organic pollutants.
在本工作中，通过简便的水热法成功制备了一种由BiWO（BWO）纳米片和棉纤维生物炭（CFB）纳米片组成的新型二维/二维（2D/2D）杂化光催化剂。通过多种技术对所制备的光催化剂进行了表征，包括X射线衍射、扫描电子显微镜、透射电子显微镜、X射线光电子能谱和紫外可见漫反射光谱。结果表明，无定形CFB纳米片均匀地固定在结晶BWO纳米片的表面，并且在CFB和BWO之间构建了紧密接触。通过在可见光照射下对水溶液中的罗丹明B（RhB）和盐酸四环素（TC-HCl）进行光催化降解，评估了所制备的BWO和CFB-BWO光催化剂的光催化活性。与原始BWO相比，CFB-BWO复合光催化剂的光催化活性有显著提高。在所有CFB-BWO样品中，CFB质量比为9%的9CFB-BWO样品对RhB或TC-HCl降解表现出最佳的光催化活性，分别约为原始BWO的1.8倍或2.4倍。CFB-BWO光催化剂光催化活性的提高可归因于CFB和BWO之间形成二维/二维界面异质结构，增强了光生电荷载流子的迁移和分离。同时，还讨论了CFB-BWO提高光催化性能的可能机制。这项工作可能为设计和开发新型基于BWO的光催化剂以高效去除有机污染物提供一种新方法。
