【摘要】 以Ce（NO₃）₃·6H₂O、NH₄HCO₃及GO（氧化石墨烯）为原料，采用水热法成功制备了多面体CeO₂/rGO（还原氧化石墨烯）复合材料，并通过混合NH₄HCO₃后在氮气条件下900℃焙烧进行氮掺杂处理，对比研究了纯多面体CeO₂与氮掺杂二氧化铈/还原氧化石墨烯（N-CeO₂/rGO）复合材料的光化学性能及光催化活性。结果发现：N-CeO₂/rGO的能带结构窄化、光生载流子分离效率提升，光催化性能得到显著改善，对有机染料亚甲基蓝（Methylene blue, MB）的降解率从74%提升至86%,对四环素（Tetracycline, TC）的降解率从60%提升至78%;N-CeO₂/rGO复合材料具有更大的Ce³⁺和O_ads（吸附氧）浓度，晶粒细化、能带窄化及明显强化的光生载流子分离效率有效促进了N-CeO₂/rGO催化效率的提升。更多还原

【Abstract】 Polyhedral CeO₂/rGO composite was successfully prepared by a hydrothermal method by using Ce（NO₃）₃·6H₂O and GO as raw materials. The photochemical properties and photocatalytic activity of pure polyhedral CeO₂ and N-CeO₂/rGO composites were comparatively studied. It was found that the energy band gap of N-CeO₂/rGO was narrowed, the photogenerated carrier separation efficiency was improved, and the photocatalytic performance was significantly promoted. The degradation ratio of organic dye MB increased from 74% to 86%, the degradation rate of TC increased from 60% to 78%; N-CeO₂/rGO composites had more Ce³⁺ and Oads concentrations. The decreased of crystal size, narrowed band gap and obviously strengthened separation efficiency of photo-generated carriers, synergistically promoted the catalytic activity of N-CeO₂/rGO.更多还原