Zhang Hongbo, Qiao Jing, Li Guanshu, Li Siyi, Wang Guowei, Wang Jun, Song Youtao
College of Chemistry, Liaoning University, Shenyang 110036, PR China.
College of Environment, Liaoning University, Shenyang 110036, PR China.
Ultrason Sonochem. 2018 Apr;42:356-367. doi: 10.1016/j.ultsonch.2017.11.043. Epub 2017 Dec 6.
In this paper, the dual-frequent sonocatalytic degradation of norfloxacin (NOR), an antibiotic, caused by Ce-doped BaZrO is studied. The used Ce-doped BaZrO as a novel sonocatalyst with highly efficient and stable sonocatalytic activity is prepared via hydrothermal method. The prepared sample is characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectra (DRS) and Fourier transform infrared spectra (FT-IR) in order to investigate the structure, morphology and chemical composition. The dual-frequent sonocatalytic activity of prepared Ce-doped BaZrO powder is evaluated through sonocatalytic degradation of norfloxacin (NOR) as a model organic pollutant. Some influencing factors such as single/dual-frequent ultrasonic frequent, cerium and zirconium molar proportions, ultrasonic irradiation time and used times are studied in detail by using UV-vis spectra. The generated reactive oxygen species (ROS) during the dual-frequent sonocatalytic degradation process of norfloxacin (NOR) are confirmed by using two different trapping agents. The holes (h) and hydroxyl radicals (OH) are identified and the holes plays a major role during the oxidation process. Finally, the possible mechanism for the dual-frequent sonocatalytic degradation of norfloxacin (NOR) caused by Ce-doped BaZrO is proposed. The experimental results show that the Ce-doped BaZrO displays a good sonocatalytic activity under dual-frequent ultrasonic irradiation. Under optimal conditions, the most of norfloxacin (NOR) can be removed under dual-frequent ultrasonic irradiation for 150 min.
本文研究了铈掺杂的BaZrO对抗生素诺氟沙星（NOR）的双频声催化降解。采用水热法制备了具有高效稳定声催化活性的新型声催化剂铈掺杂BaZrO。通过X射线衍射仪（XRD）、扫描电子显微镜（SEM）、能量色散X射线光谱仪（EDX）、X射线光电子能谱仪（XPS）、紫外-可见漫反射光谱（DRS）和傅里叶变换红外光谱（FT-IR）对制备的样品进行表征，以研究其结构、形貌和化学成分。以诺氟沙星（NOR）作为模型有机污染物，通过声催化降解来评估制备的铈掺杂BaZrO粉末的双频声催化活性。利用紫外-可见光谱详细研究了单/双频超声频率、铈锆摩尔比、超声辐照时间和使用次数等影响因素。使用两种不同的捕获剂证实了诺氟沙星（NOR）双频声催化降解过程中产生的活性氧物种（ROS）。确定了空穴（h⁺）和羟基自由基（·OH），且空穴在氧化过程中起主要作用。最后，提出了铈掺杂BaZrO引起诺氟沙星（NOR）双频声催化降解的可能机理。实验结果表明，铈掺杂BaZrO在双频超声辐照下表现出良好的声催化活性。在最佳条件下，双频超声辐照150分钟可去除大部分诺氟沙星（NOR）。
