论文部分内容阅读
利用XRD、SEM-EDS、FT-IR光谱、UV-Vis光谱等多种方法对CaTiO3-Fex进行表征,通过测定亚甲基蓝的光催化降解率来考察铁含量对CaTiO3-Fex光催化活性的影响。结果表明,当铁含量从0增加到4.745%时,CaTiO3-Fex的化学组成几乎保持不变。但是,随着铁含量的增加,CaTiO3-Fex的光吸收能力显著增强。亚甲基蓝在CaTiO3-Fex上的光催化降解遵循一级反应动力学。基于亚甲基蓝浓度的变化及其反应动力学,CaTiO3-Fe0.474%显示出最佳的光催化活性。在紫外-可见光光照3.0 h时,亚甲基蓝在CaTiO3-Fe0.474%上的光催化降解达到100%。亚甲基蓝在CaTiO3-Fe0.474%上光催化降解的表观速率常数(kobs)为1.33 h-1,是其在CaTiO3-Fe0上光催化降解的kobs的7倍。
The CaTiO3-Fex was characterized by XRD, SEM-EDS, FT-IR and UV-Vis spectroscopy. The photocatalytic activity of CaTiO3-Fex was investigated by measuring the photocatalytic degradation of methylene blue. The results show that the chemical composition of CaTiO3-Fex almost remains unchanged when the iron content increases from 0 to 4.745%. However, as the iron content increases, the light absorption capacity of CaTiO3-Fex is significantly enhanced. The photocatalytic degradation of methylene blue on CaTiO3-Fex followed first-order kinetics. Based on the change of methylene blue concentration and its reaction kinetics, CaTiO3-Fe0.474% showed the best photocatalytic activity. The photocatalytic degradation of methylene blue on CaTiO3-Fe0.474% reaches 100% at UV-visible light 3.0 h. The apparent rate constant (kobs) of methylene blue at photocatalytic degradation of CaTiO3-Fe0.474% is 1.33 h-1, which is seven times that of kobs photocatalytically degraded on CaTiO3-Fe0.