采用水热法合成了CeO₂、CeO₂/BiOBr、CeO₂/CNTs和CeO₂/BiOBr/CNTs复合纳米材料催化剂,利用XRD、SEM、BET和UV-Vis等方法对材料的结构、形貌和织构特性进行表征。在长弧氙灯照射下模拟太阳可见光降解抗生素,研究复合纳米材料的光催化氧化性能。结果表明,CeO₂与BiOBr、CNTs间的协同作用导致其对土霉素降解效果优于CeO₂;CeO₂/BiOBr/CNTs对抗生素和可见光具有更高的吸收性能,比CeO₂/BiOBr和CeO₂/CNTs有更高的降解效率。在弱碱性环境下生成活性基团 ·OH,复合材料催化效果较好。复合材料禁带宽度都在可见光范围内,CeO₂的复合提高了材料的光利用效率,增强了材料的吸附性和电子-空穴对的迁移效率,进而提高其光催化活性。回收脱附实验表明,CeO₂/BiOBr/CNTs复合材料具有较好的稳定性。

CeO₂,CeO₂/BiOBr,CeO₂/CNTs and CeO₂/BiOBr/CNTs nano composite catalysts are synthesized via a hydrothermal method.The structure,morphology,and texture characteristics of as-prepared nano composite are characterized by means of XRD,SEM,BET and UV-Vis methods.Their performances in photocatalytic degradation of antibiotics are studied under the irradiation of long arc xenon lamp.It is indicated by the results that both CeO₂/BiOBr and CeO₂/CNTs exhibit a better degradation effect on antibiotics than CeO₂ because of the synergistic effect between CeO₂ and BiOBr,CeO₂ and CNTs.CeO₂/BiOBr/CNTs displays higher absorption performance for antibiotics and visible light,and delivers higher degradation efficiency than CeO₂/BiOBr and CeO₂/CNTs.The·OH active groups generate in weakly alkaline environment,resulting in a good catalytic effect of the as-prepared composite.Band gap widths of the composite are all within the visible light range.The addition of CeO₂ helps the composite to improve its light utilization efficiency,enhancing its adsorption and electron hole pair migration efficiency,thereby increasing its photocatalytic activity.It is shown through the recovery desorption experiment that CeO₂/BiOBr/CNTs composite has good stability.