School of Ocean Science and Technology, Dalian University of Technology, Panjin 124221, China.
School of Ocean Science and Technology, Dalian University of Technology, Panjin 124221, China.
J Environ Sci (China). 2023 Dec;134:65-76. doi: 10.1016/j.jes.2022.05.045. Epub 2022 Jun 3.
BiOI/ZnO/rGO (reduced graphene oxide) composite photocatalyst was fabricated using a simple one-step hydrothermal process and applied to the degradation of antibiotic chloramphenicol (CAP). By tuning the Bi/Zn ratios, the structure and photoelectric properties of the catalyst were investigated and characterized in terms of their morphological, structural, optical and photoelectrochemical properties. The as-synthesized composite photocatalysts are well-crystalline, uniform dispersion and exhibit good photocatalytic properties. The photocatalytic degradation rate of CAP by BiOI/ZnO/rGO composite is 8.1 times and 1.8 times that of BiOI and ZnO, respectively. The photocatalytic mechanism studies revealed that the synergistic effect between rGO and BiOI/ZnO can effectively separate photogenerated electron-hole, enhance photocurrents and conductivity, and improve charge carrier densities. Moreover, BiOI/ZnO/rGO possesses good stability and reusability that the degradation efficiency remained above 80% even after 5 recycling. This study reveals that both the introduction of rGO and heterostructure construction between BiOI and ZnO play a crucial role in their photoelectrochemical and photocatalytic properties.
BiOI/ZnO/rGO（还原氧化石墨烯）复合光催化剂是通过简单的一步水热法制备的，并应用于抗生素氯霉素（CAP）的降解。通过调节 Bi/Zn 比，可以研究和表征催化剂的结构和光电性能，包括其形态、结构、光学和光电化学性能。合成的复合光催化剂结晶良好，分散均匀，具有良好的光催化性能。BiOI/ZnO/rGO 复合光催化剂对 CAP 的光催化降解速率分别是 BiOI 和 ZnO 的 8.1 倍和 1.8 倍。光催化机理研究表明，rGO 和 BiOI/ZnO 之间的协同效应可以有效分离光生载流子，增强光电流和电导率，提高载流子密度。此外，BiOI/ZnO/rGO 具有良好的稳定性和可重复使用性，即使经过 5 次循环，其降解效率仍保持在 80%以上。这项研究表明，rGO 的引入和 BiOI 与 ZnO 之间的异质结构构建都对其光电化学和光催化性能起着至关重要的作用。
