降级(电信)
光催化
可见光谱
氧气
材料科学
化学工程
析氧
光化学
化学
光电子学
催化作用
计算机科学
电化学
物理化学
生物化学
电信
电极
工程类
有机化学
作者
Reshalaiti Hailili,Zhiqiang Wang,Yingxuan Li,Yuanhao Wang,Virender K. Sharma,Xue-Qing Gong,Virender K. Sharma
标识
DOI:10.1016/j.apcatb.2017.09.026
摘要
Abstract Searching photocatalysts with sufficient utilization of sunlight and elucidating relevant reaction mechanism are still grand challenges in the field of semiconductor photocatalysis. Herein, we developed a strategy towards morphology tailoring in conjunction with oxygen vacancy in the structure of double perovskite CaCu3Ti4O12. Cube, polyhedron, nanorod and octahedron shaped CaCu3Ti4O12 morphologies were obtained by varying the salt composition during molten salt synthesis, and their visible-light photocatalytic capacities were tested for degrading an antibiotic, tetracycline. The degradation process follows a first-order kinetics, and excellent photooxidation performance was observed for octahedron and nanorod shaped CaCu3Ti4O12 giving degradation rate constants of 1.14 × 10−1 min−1 and 8.40 × 10−2 min−1, respectively, much higher than those of polyhedron and cube shapes (their rate constants were 5.10 × 10−2 min−1 and 2.80 × 10−2 min−1, respectively). The improved photoefficiency could be attributed to high abundant oxygen vacancies, surface properties, charge transfer and enhanced carrier separation due to the synergetic roles of active species, as is supported by active species trapping experiments and theoretical simulations. The detailed mechanism was proposed on the basis of crystal structure, unique morphology and spin trapping experiment, which reveals the roles of various active species for efficiency enhancement. The enhanced efficiency was further elucidated by theoretical investigations of density functional theory (DFT) calculations on the adsorption between tetracycline and CaCu3Ti4O12. The findings reported here not only provide a green and rational design of high-performance photocatalysts but also show the applications ranged from catalysis to mitigation of polluted environment.
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