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采用微波均相法制备具有光催化活性的CeO_2纳米棒,用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)、比表面积与孔径分布测试(BET-BJH)以及紫外-可见吸收光谱测试(UV-vis)等手段对其进行表征,研究了尿素浓度对晶粒尺寸、形貌和光催化性能的影响,结果表明,当尿素浓度达到6.0mol/L时产物的棒状结构明显,由粒径为20-40nm的晶粒组成的球链状结构聚集而成,且催化性能较好。以甲基橙为脱色模型进行降解反应,当氧化铈纳米棒加入量为2.0g/L时,可见光照1h后甲基橙降解率达到了95.4%,明显高于二氧化钛P25的降解率。
The photocatalytic activity of CeO_2 nanorods was investigated by microwave homogeneous method. The microstructure of the CeO_2 nanorods was characterized by SEM, TEM, XRD, BET-BJH and UV-Vis The effect of urea concentration on the grain size, morphology and photocatalytic performance was studied. The results showed that the rod-like structure of the product was obvious when the urea concentration reached 6.0mol / L, Ball-like structure composed of grains with particle size of 20-40nm is aggregated, and the catalytic performance is better. Degradation was carried out with methyl orange as a decolorization model. When the amount of cerium oxide nanorods was 2.0g / L, the degradation rate of methyl orange reached 95.4% in visible light for 1h, which was obviously higher than that of P25.