【摘 要】
：
Recently,researchers have focused on design-ing and fabricating highly efficient catalysts for photocat-alytic organic pollutant removal.Herein,CeO2 hollow spheres were prepared through a simple template method followed by calcination at different tempera
【机 构】
：
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University
论文部分内容阅读
Recently,researchers have focused on design-ing and fabricating highly efficient catalysts for photocat-alytic organic pollutant removal.Herein,CeO2 hollow spheres were prepared through a simple template method followed by calcination at different temperatures for the tetracycline(TC)degradation under simulated solar light illumination.With a calcination temperature ranging from 400 to 800℃,the as-prepared CeO2 hollow structure annealed at 600℃(C600)exhibited the best degradation performance with a degradation rate constant of 0.066 min-1,which was about six and five times higher than those of the uncalcined sample(C0)and the sample calcined at 800℃(C800),respectively.Moreover,sample C600 was also superior to the CeO2 solid particle photo-catalyst.The characterisation results showed that the improved photocatalytic performance was mainly ascribed to the synergistic effect of large specific surface areas,high crystallisation and excellent light scattering ability.Fur-thermore,the results of active species trapping experiments demonstrated that the superoxide anion(·O2-)radical and hole(h+)played dominant roles in TC degradation.Sub-sequently,the possible TC degradation pathways and photocatalytic mechanism of CeO2 hollow spheres were proposed on the basis of high-performance liquid chro-matography-mass spectrometry analysis,main active spe-cies and band edge positions of CeO2.The results of this study provide a basis for designing and exploring hollow structure catalysts for energy conversion and environmen-tal remediation.
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