Wang Ning, Wang Wei, Qi Dan, Kang Guodong, Wang Bo, Zhang Houhu, Ruan Jiuli, Lei Rongrong, Zhang Zhenhua, Zhang Shenghu, Zhou Hao
Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China; Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, 219 Ningliu Road, Nanjing 210044, China.
Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China.
Chemosphere. 2024 Mar;352:141481. doi: 10.1016/j.chemosphere.2024.141481. Epub 2024 Feb 21.
The production of cheap, efficient, and stable photocatalysts for degrading antibiotic contaminants remains challenging. Herein, BiO/boron nitride (BN)/CoO ternary composites were synthesized using the impregnation method. The morphological characteristics, structural features, and photochemical properties of the prepared photocatalysts were investigated via X-ray diffraction, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, high-resolution transmission electron microscopy, and ultraviolet-visible (Vis) diffuse reflectance spectrum techniques. BN was used as a charge transfer bridge in the ternary composites, which afforded a heterojunction between the two semiconductors. The formation of the heterojunction substantially enhanced the charge separation and improved the photocatalyst performance. The degradation activity of the BiO/BN/CoO ternary composites against norfloxacin (NOR) under Vis light irradiation was investigated. The degradation rate of NOR using 5-wt% BiO/BN/CoO reached 98% in 180 min, indicating excellent photocatalytic performance. The ternary composites also exhibited high photostability with a degradation efficiency of 88.4% after five cycles. Hydroxyl radicals (•OH), superoxide radicals (•O), and holes (h) played a synergistic role in the photocatalytic reaction, where h and •O were more important than •OH. Consequently, seven intermediates and major photocatalytic degradation pathways were identified. Toxicity experiments showed that the toxicity of the degradation solution to Chlorella pyrenoidosa decreased. Finally, the ecotoxicity of NOR and its intermediates were analyzed using the Toxicity Estimation Software Tool, with most intermediates exhibiting low toxicity.
生产用于降解抗生素污染物的廉价、高效且稳定的光催化剂仍然具有挑战性。在此，采用浸渍法合成了BiO/氮化硼（BN）/CoO三元复合材料。通过X射线衍射、傅里叶变换红外光谱、X射线光电子能谱、扫描电子显微镜、高分辨率透射电子显微镜以及紫外-可见（Vis）漫反射光谱技术对制备的光催化剂的形态特征、结构特征和光化学性质进行了研究。BN用作三元复合材料中的电荷转移桥，在两种半导体之间形成了异质结。异质结的形成显著增强了电荷分离并提高了光催化剂性能。研究了BiO/BN/CoO三元复合材料在可见光照射下对诺氟沙星（NOR）的降解活性。使用5wt%的BiO/BN/CoO时，NOR在180分钟内的降解率达到98%，表明其具有优异的光催化性能。该三元复合材料还表现出高光稳定性，经过五个循环后降解效率为88.4%。羟基自由基（•OH）、超氧自由基（•O）和空穴（h）在光催化反应中起协同作用，其中h和•O比•OH更重要。因此，确定了七种中间体和主要的光催化降解途径。毒性实验表明，降解溶液对小球藻的毒性降低。最后，使用毒性估计软件工具分析了NOR及其中间体的生态毒性，大多数中间体表现出低毒性。
